ORACLE 11i APPS ARCHITECTURE
4.ORACLE 11i APPS ARCHITECTURE-SKETCH
Thursday, July 30, 2009 | Posted by vungaralas at 4:10 AM 0 comments
3.Oracle Apps DBA technical Interview questions
Oracle Apps DBA technical Interview questions
Differentiate between TRUNCATE and DELETE.
The Delete command will log the data changes in the log file where as the truncate will simply remove the data without it. Hence Data removed by Delete command can be rolled back but not the data removed by TRUNCATE. Truncate is a DDL statement whereas DELETE is a DML statement.
What is the maximum buffer size that can be specified using the DBMS_OUTPUT.ENABLE function?
1000000
Can you use a commit statement within a database trigger?
Yes, if you are using autonomous transactions in the Database triggers.
What is an UTL_FILE? What are different procedures and functions associated with it?
The UTL_FILE package lets your PL/SQL programs read and write operating system (OS) text files. It provides a restricted version of standard OS stream file input/output (I/O).
Subprogram -Description
FOPEN function-Opens a file for input or output with the default line size.
IS_OPEN function -Determines if a file handle refers to an open file.
FCLOSE procedure -Closes a file.
FCLOSE_ALL procedure -Closes all open file handles.
GET_LINE procedure -Reads a line of text from an open file.
PUT procedure-Writes a line to a file. This does not append a line terminator.
NEW_LINE procedure-Writes one or more OS-specific line terminators to a file.
PUT_LINE procedure -Writes a line to a file. This appends an OS-specific line terminator.
PUTF procedure -A PUT procedure with formatting.
FFLUSH procedure-Physically writes all pending output to a file.
FOPEN function -Opens a file with the maximum line size specified.
Difference between database triggers and form triggers?
Database triggers are fired whenever any database action like INSERT, UPATE, DELETE, LOGON LOGOFF etc occurs. Form triggers on the other hand are fired in response to any event that takes place while working with the forms, say like navigating from one field to another or one block to another and so on.
What is OCI. What are its uses?
OCI is Oracle Call Interface. When applications developers demand the most powerful interface to the Oracle Database Server, they call upon the Oracle Call Interface (OCI). OCI provides the most comprehensive access to all of the Oracle Database functionality. The newest performance, scalability, and security features appear first in the OCI API. If you write applications for the Oracle Database, you likely already depend on OCI. Some types of applications that depend upon OCI are:
· PL/SQL applications executing SQL
· C++ applications using OCCI
· Java applications using the OCI-based JDBC driver
· C applications using the ODBC driver
· VB applications using the OLEDB driver
· Pro*C applications
· Distributed SQL
What are ORACLE PRECOMPILERS?
A precompiler is a tool that allows programmers to embed SQL statements in high-level source programs like C, C++, COBOL, etc. The precompiler accepts the source program as input, translates the embedded SQL statements into standard Oracle runtime library calls, and generates a modified source program that one can compile, link, and execute in the usual way. Examples are the Pro*C Precompiler for C, Pro*Cobol for Cobol, SQLJ for Java etc.
What is syntax for dropping a procedure and a function? Are these operations possible?
Drop Procedure/Function ; yes, if they are standalone procedures or functions. If they are a part of a package then one have to remove it from the package definition and body and recompile the package.
How to check if Apps 11i System is Autoconfig enabled ?
Under $AD_TOP/bin check for file adcfginfo.sh and if this exists use adcfginfo.sh contextfile=
If this file is not there , look for any configuration file under APPL_TOP if system is Autoconfig enabled then you will see entry like
How to check if Oracle Apps 11i System is Rapid Clone enabled ?
For syetem to be Rapid Clone enabled , it should be Autoconfig enabled (Check above How to confirm if Apps 11i is Autoconfig enabled). You should have Rapid Clone Patches applied , Rapid Clone is part of Rapid Install Product whose Family Pack Name is ADX. By default all Apps 11i Instances 11.5.9 and above are Autoconfig and Rapid Clone enabled.
Whats is difference between two env files in
APPS
Whats main concurrent Manager types.
# ICM - Internal Concurrent Manager which manages concurrent Managers
# Standard Managers - Which Manage processesing of requests.
# CRM - Conflict Resolution Managers , resolve conflicts in case of incompatibility.
Whats US directory in $AD_TOP or under various product TOP's .
US directory is defauly language directory in Oracle Applications. If you have multiple languages Installed in your Applications then you will see other languages directories besides US, that directory will contain reports, fmx and other code in that respective directory like FR for France, AR for arabic, simplifies chinese or spanish.
Where is Concurrent Manager log file location.
By default standard location is $APPLCSF/$APPLLOG , in some cases it can go to $FND_TOP/log as well.
Where would i find .rf9 file, and what execatly it dose ?
These files are used during restart of patch in case of patch failure because of some reason.
Where is appsweb.cfg or appsweb_$CONTEXT.cfg stored and why its used ?
This file is defined by environment variable FORMS60_WEB_CONFIG_FILE This is usually in directory $OA_HTML/bin on forms tier.
This file is used by any forms client session. When a user try to access forms , f60webmx picks up this file and based on this configuration file creates a forms session to user/client.
What is Multi Node System ?
Multi Node System in Oracle Applications 11i means you have Applications 11i Component on more than one system. Typical example is Database, Concurrent Manager on one machine and forms, Web Server on second machine is example of Two Node System.
Can a function take OUT parameters. If not why?
yes, IN, OUT or IN OUT.
Can the default values be assigned to actual parameters?
Yes. In such case you don’t need to specify any value and the actual parameter will take the default value provided in the function definition.
What is difference between a formal and an actual parameter?
The formal parameters are the names that are declared in the parameter list of the header of a module. The actual parameters are the values or expressions placed in the parameter list of the actual call to the module.
What are different modes of parameters used in functions and procedures?
There are three different modes of parameters: IN, OUT, and IN OUT.
IN - The IN parameter allows you to pass values in to the module, but will not pass anything out of the module and back to the calling PL/SQL block. In other words, for the purposes of the program, its IN parameters function like constants. Just like constants, the value of the formal IN parameter cannot be changed within the program. You cannot assign values to the IN parameter or in any other way modify its value.
IN is the default mode for parameters. IN parameters can be given default values in the program header.
OUT - An OUT parameter is the opposite of the IN parameter. Use the OUT parameter to pass a value back from the program to the calling PL/SQL block. An OUT parameter is like the return value for a function, but it appears in the parameter list and you can, of course, have as many OUT parameters as you like.
Inside the program, an OUT parameter acts like a variable that has not been initialised. In fact, the OUT parameter has no value at all until the program terminates successfully (without raising an exception, that is). During the execution of the program, any assignments to an OUT parameter are actually made to an internal copy of the OUT parameter. When the program terminates successfully and returns control to the calling block, the value in that local copy is then transferred to the actual OUT parameter. That value is then available in the calling PL/SQL block.
IN OUT - With an IN OUT parameter, you can pass values into the program and return a value back to the calling program (either the original, unchanged value or a new value set within the program). The IN OUT parameter shares two restrictions with the OUT parameter:
An IN OUT parameter cannot have a default value.
An IN OUT actual parameter or argument must be a variable. It cannot be a constant, literal, or expression, since these formats do not provide a receptacle in which PL/SQL can place the outgoing value.
Difference between procedure and function.
A function always returns a value, while a procedure does not. When you call a function you must always assign its value to a variable.
Can cursor variables be stored in PL/SQL tables. If yes how. If not why?
Yes. Create a cursor type - REF CURSOR and declare a cursor variable of that type.
DECLARE
/* Create the cursor type. */
TYPE company_curtype IS REF CURSOR RETURN company%ROWTYPE;
/* Declare a cursor variable of that type. */
company_curvar company_curtype;
/* Declare a record with same structure as cursor variable. */
company_rec company%ROWTYPE;
BEGIN
/* Open the cursor variable, associating with it a SQL statement. */
OPEN company_curvar FOR SELECT * FROM company;
/* Fetch from the cursor variable. */
FETCH company_curvar INTO company_rec;
/* Close the cursor object associated with variable. */
CLOSE company_curvar;
END;
Can you clone from multi node system to single node system and vice versa ?
Yes , this is now supported via Rapid Clone, Check if your system has all prereq. patches for Rapid Clone and you are on latest rapid clone patch.
Does rapid clone takes care of Updating Global oraInventory or you have to register manually in Global OraInventory after clone ?
Rapid Clone will automatically Update Global oraInventory during configuration phase. You don't have to do any thing manually for Global oraInventory.
What is .dbc file , where its stored , whats use of .dbc file ?
dbc as name says is database connect descriptor file which stores database connection information used by application tier to connect to database. This file is in directory $FND_TOP/secure also called as FND_SECURE
Whats things you do to reduce patch timing ?
You can take advantage of following -
# Merging patches via admrgpch
# Use various adpatch options like nocompiledb or nocompilejsp
# Use defaults file
# Staged APPL_TOP during upgrades
# Increase batch size (Might result into negative )
How you put Applications 11i in Maintenance mode ?
Use adadmin to change Maintenance mode is Oracle Apps. With AD.I you need to enable maintenance mode in order to apply apps patch via adpatch utility. If you don't want to put apps in maintenance mode you can use adpatch options=hotpatch feature.
Can you apply patch without putting Applications 11i in Maintenance mode ?
Yes, use options=hotpatch as mentioned above with adpatch.
What are various options available with adpatch ?
Various options available with adpatch depending on your AD version are autoconfig, check_exclusive, checkfile, compiledb, compilejsp, copyportion, databaseprtion, generateportion, hotpatch, integrity, maintainmrc, parallel, prereq, validate
ADIDENT UTILITY is used for what ?
ADIDENT UTILITY in oracle apps is used to find version of any file . AD Identification. for ex. "adident Header
How do you pass cursor variables in PL/SQL?
Pass a cursor variable as an argument to a procedure or function. You can, in essence, share the results of a cursor by passing the reference to that result set.
How do you open and close a cursor variable. Why it is required?
Using OPEN cursor_name and CLOSE cursor_name commands. The cursor must be opened before using it in order to fetch the result set of the query it is associated with. The cursor needs to be closed so as to release resources earlier than end of transaction, or to free up the cursor variable to be opened again.
What should be the return type for a cursor variable. Can we use a scalar data type as return type?
The return type of a cursor variable can be %ROWTYPE or record_name%TYPE or a record type or a ref cursor type. A scalar data type like number or varchar can’t be used but a record type may evaluate to a scalar value.
What is use of a cursor variable? How it is defined?
Cursor variable is used to mark a work area where Oracle stores a multi-row query output for processing. It is like a pointer in C or Pascal. Because it is a TYPE, it is defined as TYPE REF CURSOR RETURN ;
What WHERE CURRENT OF clause does in a cursor?
The Where Current Of statement allows you to update or delete the record that was last fetched by the cursor.
Difference between NO DATA FOUND and %NOTFOUND
NO DATA FOUND is an exception which is raised when either an implicit query returns no data, or you attempt to reference a row in the PL/SQL table which is not yet defined. SQL%NOTFOUND, is a BOOLEAN attribute indicating whether the recent SQL statement does not match to any row.
What is a cursor for loop?
A cursor FOR loop is a loop that is associated with (actually defined by) an explicit cursor or a SELECT statement incorporated directly within the loop boundary. Use the cursor FOR loop whenever (and only if) you need to fetch and process each and every record from a cursor, which is a high percentage of the time with cursors.
What is iAS Patch ?
iAS Patch are patches released to fix bugs associated with IAS_ORACLE_HOME (Web Server Component) Usually these are shiiped as Shell scripts and you apply iAS patches by executing Shell script. Note that by default ORACLE_HOME is pointing to 8.0.6 ORACLE_HOME and if you are applying iAS patch export ORACLE_HOME to iAS . You can do same by executing environment file under $IAS_ORACLE_HOME
If we run autoconfig which files will get effected ?
In order to check list of files changes during Autoconfig , you can run adchkcfg utility which will generate HTML report. This report will list all files and profile options going to change when you run AutoConfig.
What is difference between .xml file and AutoConfig ?
Autoconfig is Utility to configure your Oracle Application environment. .xml file is repository of all configuration from which AutoConfig picks configuration and polulates related files.
What is .lgi files ?
lgi files are created with patching along with .log files . .lgi files are informative log files containing information related to patch. You can check .lgi files to see what activities patch has done. Usually informative logs.
How will you skip worker during patch ?
If in your adctrl there are six option shown then seventh is hidden option.(If there are seven options visible then 8th option is to Skip worker depending on ad version).
Which two tables created at start of Apps Patch and drops at end of Patch ?
FND_INSTALLED_PROCESS and AD_DEFFERED_JOBS are the tables that get updated while applying a patch mainly d or unified driver.
How to compile an Oracle Reports file ?
Utility adrepgen is used to compile Reports. Synatx is given below adrepgen userid=apps\
What is difference between AD_BUGS and AD_APPLID_PATCHES ?
AD_BUGS holds information about the various Oracle Applications bugs whose fixes have been applied (ie. patched) in the Oracle Applications installation.
AD_APPLIED_PATCHES holds information about the "distinct" Oracle Applications patches that have been applied. If 2 patches happen to have the same name but are different in content (eg. "merged" patches), then they are considered distinct and this table will therefore hold 2 records.
What is ADSPLICE UTILITY ?
ADSPLICE UTILITY in oracle apps is utility to add a new product.
How can you licence a product after installation ?
You can use ad utility adlicmgr to licence product in Oracle Apps.
What is MRC ? What you do as Apps DBA for MRC ?
MRC also called as Multiple Reporting Currency in oracle Apps. Default you have currency in US Dollars but if your organization operating books are in other currency then you as apps dba need to enable MRC in Apps. How to enable MRC coming soon...
What is access_log in apache , what entries are recored in access_log ? Where is default location of thsi file ?
access_log in Oracle Application Server records all users accessing oracle applications 11i. This file location is defined in httpd.conf with default location at $IAS_ORACLE_HOME/Apache/
198.0.0.1 - - [10/Sep/2006:18:37:17 +0100] "POST /OA_HTML/OA.jsp?.... HTTP/1.1" 200 28035
where 200 is HTTP status code and last digits 28035 is bytes dowloaded as this page(Size of page)
Where is Jserv configuration files stored ?
Jserv configuration files are stored in $IAS_ORACLE_HOME/Apache/Jserv/
Where is applications start/stop scripts stored ?
applications start/stop scripts are in directory $COMMON_TOP/admin/scripts/$
What are main configuration files in Web Server (Apache) ?
Main configuration files in Oracle Apps Web Server are
# httpd.conf, apps.conf, oracle_apache.conf, httpd_pls.conf
# jserv.conf, ssp_init.txt, jserv.properties, zone.properties
# plsql.conf, wdbsvr.app, plsql.conf
Can C driver in apps patch create Invalid Object in database ?
No , C driver only copies files in File System. Database Object might be invalidated during D driver when these objects are created/dropped/modified.
What is dev60cgi and f60cgi ?
CGI stands for Common Gateway Interface and these are Script Alias in Oracle Apps used to access forms server . Usually Form Server access directly via
Why does a worker fails in Oracle Apps Patch and few scenarios in which it failed for you ?
Apps Patch worker can fail in case it doesn't find expected data, object, files or any thing which driver is trying to update/edit/modify. Possible symptoms may be underlying tables/objects are invalid, a prereq patch is missing , login information is incorrect, inconsistency in seeded data...
What is difference between mod_osso and mod_ose in Oracle HTTP Server ?
mod_osso is Oracle Single Sign-On Module where as mod_ose is module for Oracle Servlet Engine.
mod_osso is module in Oracle's HTTP Server serves as Conduit between Oracle Apache Server and Singl Sign-On Server where as mod_ose is also another module in Oracle's HTTP Server serves as conduit between Oracle Apache and Oracle Servlet Engine.
What is difference between COMPILE_ALL=SPECIAL and COMPILE=ALL while compiling Forms ?
Both the options will compile all the PL/SQL in the resultant .FMX, .PLX, or .MMX file but COMPILE_ALL=YES also changes the cached version in the source .FMB, .PLL, or .MMB file. This confuses version control and build tools (CVS, Subversion, make, scons); they believe you've made significant changes to the source. COMPILE_ALL=SPECIAL does not do this.
What is GSM in Oracle application E-Business Suite ?
GSM stands for Generic Service Management Framework. Oracle E-Business Suite consist of various compoennts like Forms, Reports, Web Server, Workflow, Concurrent Manager ..
Earlier each service used to start at their own but managing these services (given that) they can be on various machines distributed across network. So Generic Service Management is extension of Concurrent Processing which manages all your services , provide fault tolerance (If some service is down ICM through FNDSM and other processes will try to start it even on remote server) With GSM all services are centrally managed via this Framework.
What is FNDSM ?
FNDSM is executable and core component in GSM ( Generic Service Management Framework discussed above). You start FNDSM services via APPS listener on all Nodes in Application Tier in E-Business Suite.
What are cursor attributes?
Cursor attributes are used to get the information about the current status of your cursor. Both explicit and implicit cursors have four attributes, as shown:
Name Description
%FOUND Returns TRUE if record was fetched successfully, FALSE otherwise.
%NOTFOUND Returns TRUE if record was not fetched successfully, FALSE otherwise.
%ROWCOUNT Returns number of records fetched from cursor at that point in time.
%ISOPEN Returns TRUE if cursor is open, FALSE otherwise.
Difference between an implicit and an explicit cursor.
The implicit cursor is used by Oracle server to test and parse the SQL statements and the explicit cursors are declared by the programmers.
What is a cursor?
A cursor is a mechanism by which you can assign a name to a “select statement” and manipulate the information within that SQL statement.
What is the purpose of a cluster?
A cluster provides an optional method of storing table data. A cluster is comprised of a group of tables that share the same data blocks, which are grouped together because they share common columns and are often used together. For example, the EMP and DEPT table share the DEPTNO column. When you cluster the EMP and DEPT, Oracle physically stores all rows for each department from both the EMP and DEPT tables in the same data blocks. You should not use clusters for tables that are frequently accessed individually.
How do you find the number of rows in a Table ?
select count(*) from table, or from NUM_ROWS column of user_tables if the table statistics has been collected.
Display the number value in Words?
What is a pseudo column. Give some examples?
Information such as row numbers and row descriptions are automatically stored by Oracle and is directly accessible, ie. not through tables. This information is contained within pseudo columns. These pseudo columns can be retrieved in queries. These pseudo columns can be included in queries which select data from tables.
Available Pseudo Columns
· ROWNUM - row number. Order number in which a row value is retrieved.
· ROWID - physical row (memory or disk address) location, ie. unique row identification.
· SYSDATE - system or today’s date.
· UID - user identification number indicating the current user.
· USER - name of currently logged in user.
Whats is location of access_log file ?
access_log file by default is located in $IAS_ORACLE_HOME/ Apache/Apache/logs. Location of this file is defined in httpd.conf by patameter CustomLog or TransferLog
What is your Oracle Apps 11i Webserver Version and how to find it ?
From 11.5.8 to 11.5.10 Webserver version is iAS 1.0.2.2.2, In order to find version under $IAS_ORACLE_HOME/Apache/
./httpd -version
Server version: Oracle HTTP Server Powered by Apache/1.3.19
Server built: Dec 6 2005 14:59:13 (iAS 1.0.2.2.2 rollup 5)
What is Location of Jserv configuration files ?
Jserv configuration files are located in $IAS_ORACLE_HOME /Apache/Jserv/etc .
What is plssql/database cache ?
In order to improve performance mod_pls (Apache component) caches some database content to file. This database/plssql cache is usually of type session and plsql cache
# session cache is used to store session information.
# plsql cache is used to store plsql cache i.e. used by mod_pls
Where is DATABASE/PLSSQL cache stored ?
PLSSQL and session cache are stored under $IAS_ORACLE_HOME/ Apache/modplsql/cache directory.
What is *.DBC file and whats is location of DBC file ?
DBC as name stands for is database connect descriptor file used to connect to database. This file by default located in $FND_TOP/secure directory also called as $FND_SECURE directory.
What is content of DBC file and why its important ?
DBC file is quite important as whenever Java or any other program like forms want to connect to database it uses DBC file. Typical entry in DBC file is
GUEST_USER_PWD
APPS_JDBC_URL
DB_HOST
What are few profile options which you update after cloning ?
Rapid clone updates profile options specific to site level . If you have any profile option set at other levels like server, responsibility, user....level then reset them.
How to retrieve SYSADMIN password ?
If forgot password link is enabled and SYSADMIN account is configured with mail id user forget password link else you can reset sSYSADMIN password via FNDCPASS.
Whats is TWO_TASK in Oracle Database ?
TWO_TASK mocks your tns alias which you are going to use to connect to database. Lets assume you have database client with tns alias defined as PROD to connect to Database PROD on machine teachmeoracle.com listening on port 1521. Then usual way to connect is sqlplus username/passwd@PROD ; now if you don't want to use @PROD then you set TWO_TASK=PROD and then can simply use sqlplus username/passwd then sql will check that it has to connect to tnsalias define by value PROD i.e. TWO_TASK
What is GWYUID ?
GWYUID , stands for Gateway User ID and password. Usually like APPLSYSPUB/PUB
Where GWYUID defined and what is its used in Oracle Applications ?
GWYUID is defined in dbc i.e. Database Connect Descriptor file . It is used to connect to database by think clients.
If APPS_MRC schema is not used in 11.5.10 and higher then How MRC is working ?
For products like Payable, Recievables which uses MRC and if MRC is enabled then each transaction table in base schema related to currency now has an assoicated MRC Subtables.
When you apply C driver patch does it require database to be Up and Why ?
Yes , database and db listener should be Up when you apply any driver patch in apps. even if driver is not updating any database object connection is required to validate appsand other schema and to upload patch history information in database tables.
How you will avoid your query from using indexes?
By changing the order of the columns that are used in the index, in the Where condition, or by concatenating the columns with some constant values.
What is a OUTER JOIN?
An OUTER JOIN returns all rows that satisfy the join condition and also returns some or all of those rows from one table for which no rows from the other satisfy the join condition.
Which is more faster - IN or EXISTS?
Well, the two are processed very differently.
Select * from T1 where x in ( select y from T2 )
is typically processed as:
select *
from t1, ( select distinct y from t2 ) t2
where t1.x = t2.y;
The sub query is evaluated, distinct’ed, indexed (or hashed or sorted) and then joined to the original table — typically. As opposed to select * from t1 where exists ( select null from t2 where y = x )
That is processed more like:
for x in ( select * from t1 )
loop
if ( exists ( select null from t2 where y = x.x )
then
OUTPUT THE RECORD
end if
end loop
It always results in a full scan of T1 whereas the first query can make use of an index on T1(x). So, when is where exists appropriate and in appropriate? Lets say the result of the sub query ( select y from T2 ) is “huge” and takes a long time. But the table T1 is relatively small and executing ( select null from t2 where y = x.x ) is very fast (nice index on t2(y)). Then the exists will be faster as the time to full scan T1 and do the index probe into T2 could be less then the time to simply full scan T2 to build the sub query we need to distinct on.
Lets say the result of the sub query is small — then IN is typically more appropriate. If both the sub query and the outer table are huge — either might work as well as the other — depends on the indexes and other factors.
When do you use WHERE clause and when do you use HAVING clause?
The WHERE condition lets you restrict the rows selected to those that satisfy one or more conditions. Use the HAVING clause to restrict the groups of returned rows to those groups for which the specified condition is TRUE.
There is a % sign in one field of a column. What will be the query to find it?
SELECT column_name FROM table_name WHERE column_name LIKE ‘%\%%’ ESCAPE ‘\’;
Where will you find forms configuration details apart from xml file ?
Forms configuration at time of startup is in script adfrmctl.sh and appsweb_$CONTEXT_NAME.cfg (defined by environment variable FORMS60_WEB_CONFIG_FILE) for forms client connection used each time a user initiates forms connection.
What is forms server executable Name ?
f60srvm
What are different modes of forms in which you can start Forms Server and which one is default ?
You can start forms server in SOCKET or SERVLET by defualt Forms are configured to start in socket mode.
How you will start Discoverer in Oracle Apps 11i ?
In order to start dicoverer you can use script addisctl.sh under $OAD_TOP/admin/scripts/$
How many ORACLE HOME are Oracle Apps and whats significance of each ?
There are three $ORACLE_HOME in Oracle Apps, Two for Application Tier (Middle Tier) and One in Database Tier.
# ORACLE_HOME 1 : On Application Tier used to store 8.0.6 techstack software. This is used by forms, reports and discoverer. ORACLE_HOME should point to this ORACLE_HOME which applying Apps Patch.
# ORACLE_HOME 2: On Application Tier used by iAS (Web Server) techstack software. This is used by Web Listener and contains Apache.
# ORACLE_HOME 3: On Database Tier used by Database Software usually 8i,9i or 10g database.
Where is HTML Cache stored in Oracle Apps Server ?
Oracle HTML Cache is available at $COMMON_TOP/_pages for some previous versions you might find it in $OA_HTML/_pages
Where is plssql cache stored in Oracle Apps ?
Usually two type of cache session and plssql stored under $IAS_ORACLE_HOME/Apache/
What happens if you don't give cache size while defining Concurrent Manager ?
Lets first understand what is cache size in Concurrent Manager. When Manager picks request from FND CONCURRENT REQUESTS Queues, it will pick up number of requests defined by cache size in one shot and will work on them before going to sleep. If you don't define cache size while defining CM then it will take default value 1, i.e. picking up one request per cycle.
There are lot of DBC file under $FND_SECURE, How its determined that which dbc file to use from $FND_SECURE ?
This value is determined from profile option "Applications Database ID"
What is RRA/FNDFS ?
Report Review Agent(RRA) also referred by executable FNDFS is default text viewer in Oracle Applications 11i for viewing output files and log files. As most of apps dba's are not clear about Report Server and RRA, I'll discuss one on my blog and update link here .
What is PCP is Oracle Applications 11i ?
PCP is acronym for Parallel Concurrurent processing. Usually you have one Concurrent Manager executing your requests but if you can configure Concurrent Manager running on two machines (Yes you need to do some additional steps in order to configure Parallel Concurrent Processing) . So for some of your requests primary CM Node is on machine1 and secondary CM node on machine2 and for some requests primary CM is on machine2 and secondary CM on machine1.
Why I need two Concurrent Processing Nodes or in what scenarios PCP is Used ?
Well If you are running GL Month end reports or taxation reports annually these reposrts might take couple of days. Some of these requests are very resource intensive so you can have one node running long running , resource intensive requests while other processing your day to day short running requets.
Another scenario is when your requests are very critical and you want high resilience for your Concurrent Processing Node , you can configure PCP. So if node1 goes down you still have CM node available processing your requests.
Output and Logfiles for requests executed on source Instance not working on cloned Instance
Here is exact problem description - You cloned an Oracle Apps Instance from PRODBOX to another box with Instance name say CLONEBOX on 1st of August. You can any CM logs/output files after 1st of August only becuase these all are generated on CLONEBOX itself, But unable to view the logs/output files which are prior to 1st August. What will you do and where to check ?
Log , Output file path and location is stored in table FND_CONCURRENT_REQUESTS. Check select logfile_name, logfile_node_name, outfile_name, outfile_node_name from fnd_concurrent_requests where request_id=&requestid ; where requestid is id of request for which you are not able to see log or out files. You should see output like /u01/PRODBOX/log/l123456.req, host1,/u01/PRODBOX/out/
Update it according to your cloned Instance Variables.
How to confirm if Report Server is Up and Running ?
Report Server is started by executable rwmts60 on concurrent manager Node and this file is under $ORACLE_HOME/bin .execute command on your server like
ps -ef | grep rwmts60
You should get output like
applmgr ....... rwmts60 name=REP60_VISION
What is difference between ICM, Standard Managers and CRM in Concurrent Manager ?
# ICM stand for Internal Concurrent Manager, which controls other managers. If it finds other managers down , it checks and try to restart them. You can say it as administrator to other concurrent managers. It has other tasks as well.
# Standard Manager These are normal managers which control/action on the requests nd does batch or single request processing. # CRM acronym for Conflict Resolution Manager is used to resolve conflicts between managers nd request. If a request is submitted whose execution is clashing or it is defined not to run while a particular type of request is running then such requests are actioned/assigned to CRM for Incompatibilities and Conflict resolution.
What is difference between SUBSTR and INSTR?
INSTR function search string for sub-string and returns an integer indicating the position of the character in string that is the first character of this occurrence. SUBSTR function return a portion of string, beginning at character position, substring_length characters long. SUBSTR calculates lengths using characters as defined by the input character set.
Which data type is used for storing graphics and images?
Raw, Long Raw, and BLOB.
What is difference between SQL and SQL*PLUS?
SQL is the query language to manipulate the data from the database. SQL*PLUS is the tool that lets to use SQL to fetch and display the data.
What is difference between UNIQUE and PRIMARY KEY constraints?
An UNIQUE key can have NULL whereas PRIMARY key is always not NOT NULL. Both bears unique values.
What is difference between Rename and Alias?
Rename is actually changing the name of an object whereas Alias is giving another name (additional name) to an existing object.
Rename is a permanent name given to a table or column whereas Alias is a temporary name given to a table or column which do not exist once the SQL statement is executed.
What are various joins used while writing SUBQUERIES?
=, , IN, NOT IN, IN ANY, IN ALL, EXISTS, NOT EXISTS.
What is use of Apps listener ?
Apps Listener usually running on All Oracle Applications 11i Nodes with listener alias as APPS_$SID is mainly used for listening requests for services like FNDFS and FNDSM.
How to start Apps listener ?
In Oracle 11i, you have script adalnctl.sh which will start your apps listener. You can also start it by command lsnrctl start APPS_$SID (Replace sid by your Instance SID Name)
How to confirm if Apps Listener is Up and Running ?
execute below command
lsnrctl status APPS_$SID (replcae SID with your Instance Name)
so If your SID is VISION then use lsnrctl status APPS_VISION out put should be like
Services Summary...
FNDFS has 1 service handler(s)
FNDSM has 1 service handler(s)
What is Web Listener ?
Web Listener is Web Server listener which is listening for web Services(HTTP) request. This listener is started by adapcctl.sh and defined by directive (Listen, Port) in httpd.conf for Web Server. When you initially type request like
How will you find Invalid Objects in database ?
using query SQLPLUS> select count(*) from dba_objects where status like 'INVALID';
How to compile Invalid Objects in database ?
You can use adadmin utility to compile or you can use utlrp.sql script shipped with Oracle Database to compile Invalid Database Objects.
How to compile JSP in Oracle Apps ?
You can use ojspCompile.pl perl script shipped with Oracle apps to compile JSP files. This script is under $JTF_TOP/admin/scripts. Sample compilation method is
perl ojspCompile.pl --compile --quiet
What is difference between ADPATCH and OPATCH ?
# ADPATCH is utility to apply oracle apps Patches whereas
# OPATCH is utility to apply database patches
Can you use both ADPATCH and OPATCH in Apps ?
Yes you have to use both in apps , for apps patches you will use ADPATCH UTILITY and for applying database patch in apps you will use opatch UTILITY.
Posted by vungaralas at 12:13 AM 0 comments
2.ORACLE APPSDBA INTERVIEW QUESTIONS
Q1. What is wdbsvr.app file used for? What's full path of this file? What's significance of this file ?
Ans: The wdbsvr.app is used by mod_plsql component of Apache to connect to
database. The File is located at $IAS_ORACLE_HOME/Apache/
Q2. Where would i find .rf9 file, and what execatly it does ?
Ans: These files are used during restart of patch in case of patch failure because of some reason.
Q3. Where is appsweb.cfg or appsweb_$CONTEXT.cfg stored & why its used?
Ans: This file is defined by environment variable FORMS60_WEB_CONFIG_FILE This is usually in directory $OA_HTML/bin on forms tier. This file is used by any forms client session. When a user try to access forms , f60webmx picks up this file and based on this configuration file creates a forms session to user/client.
Q4. Can you clone from multi node system to single node system & vice versa ?
Ans: Yes.
Q5. What is .dbc file , there are lot of dbc file under $FND_SECURE, How its determined that which dbc file to use from $FND_SECURE ?
Ans: dbc as name says is database connect descriptor file which stores database connection information used by application tier to connect to database. This file is in directory $FND_TOP/secure also called as FND_SECURE
Q6. Whats things you do to reduce patch timing ?
Ans: # Merging patches via admrgpch
# Use various adpatch options like nocompiledb or nocompilejsp
# Use defaults file
# Staged APPL_TOP during upgrades
# Increase batch size (Might result into negative )
Q7. Can you apply patch without putting Applications 11i in Maintenance mode ?
Ans: Yes, use options=hotpatch as mentioned above with adpatch. from AD.I onwards we need to enable maintenance mode inorder to apply apps patches.
Q8. adident utility is used for what ?
Ans: adident utility in oracle apps is used to find version of any file . AD Identification.
for ex. "adident Header
Q9. How can you licence a product after installation ?
Ans: By using ad utility adlicmgr to licence product in Oracle Apps.
Q10. What is MRC ? What you do to enable MRC in Apps ?
Ans: MRC also called as Multiple Reporting Currency in oracle Apps. Default you have currency in US Dollars but if your organization operating books are in other currency then you as apps dba need to enable MRC in Apps.
Q11. What is access_log in apache , what entries are recored in access_log ? Where is default location of this file ?
Ans: access_log in Oracle Application Server records all users accessing oracle applications 11i. This file location is defined in httpd.conf with default location at $IAS_ORACLE_HOME/Apache/
198.0.0.1 - - [10/Sep/2006:18:37:17 +0100] "POST /OA_HTML/OA.jsp?.... HTTP/1.1" 200 28035
where 200 is HTTP status code & last digits 28035 is bytes dowloaded as this page(Size of page).
Q12. What is session time out parameter & where all you define these values ?
Ans: In order to answer first you have to understand what kind of seesions are in Apps 11i and what is Idle timeout ?
In Apps there are two broad categories of session
- Self Service Application Session ( Server by Web Server iAS Apache & Jserv, like iRecruitment, iProcurement)
-Forms session ( served by your form session, like system Administrator)
What is Session Idle time ?
If Oracle Apps client is not doing any activity for some time (when application user goes for coffee or talks over phone) session during that time is called as Idle Session & because of security reason, performance issues and to free up system resource Oracle Applications terminates client session( both forms & self service) after idle time value is reached to the one mentioned in configuration file.
From FND.G or 11.5.9 or with introduction of AppsLocalLogin.jsp to enter into application, profile option "ICX Session Timeout" is used only to determine Forms Session Idle timeout value . This might be confusing as earlier this profile option used to control forms as well as self service application(with session.timeout) session.timeout is used to control Idle session timeout for Self Service Applications ( Served by Jserv via JVM )
From where ICX : Session Timeout & session.timeout get values ?
Autoconfig determines value for profile option "ICX: Session Timeout" and "session.timeout" from entry in context file ( $APPL_TOP/admin/SID_hostname.
session.timeout mentioned in zone.properties is in milli secondsICX Session Time out mentioned in profile option ICX: Session Timeout is in minutes so ICX session timeout=30 & session.timeout= 1800,000 are same 30 minutes
P.S. ICX Session time out was introduced in FND.D so if your FND version is below D you might not see this variable.
Important Things Apps DBA should consider while setting session timeout value ?
1.. If you keep session.timeout value too high , when some oracle application user accessing Self service application terminates
his session, so longer idle session will drain JVM resource & can result in Java.Lang No Memory available issues .
2. If you keep it too low, users going out for tea or sitting idle for some time have to login again into application & can be
annoying .
Thumb rule is session time out usually set to 30 minutes.
Q13. Where is applications start/stop scripts stored ?
Ans: $COMMON_TOP/admin/scripts/$
Q14. What are main configuration files in Web Server (Apache) ?
Ans: Main configuration files in Oracle Apps Web Server are
# httpd.conf, apps.conf, oracle_apache.conf, httpd_pls.conf
# jserv.conf, ssp_init.txt, jserv.properties, zone.properties
# plsql.conf, wdbsvr.app, plsql.conf
Q15. How to check if Apps 11i System is Autoconfig enabled ?
Ans: Under $AD_TOP/bin check for file adcfginfo.sh & if this exists use
adcfginfo.sh contextfile= show=enabled
If this file is not there , look for any configuration file under APPL_TOP if system is Autoconfig enabled then you will see entry like
# AutoConfig automatically generates this file. It will be read and .......
Q16. How to check if Oracle Apps 11i System is Rapid Clone enabled ?
Ans: For syetem to be Rapid Clone enabled , it should be Autoconfig enabled (Check above How to confirm if Apps 11i is Autoconfig enabled). You should have Rapid Clone Patches applied , Rapid Clone is part of Rapid Install Product whose Family Pack Name is ADX. By default all Apps 11i Instances 11.5.9 and above are Autoconfig & Rapid Clone enabled.
Q17. What is plssql/database cache?
Ans: In order to improve performance mod_pls (Apache component) caches some database content to file. This database/plssql cache is usually of type session & plsql cache
# session cache is used to store session information.
# plsql cache is used to store plsql cache i.e. used by mod_pls
Q18. How to determine Oracle Apps 11i Version ?
Ans: select RELEASE_NAME from fnd_product_groups;
You should see output like
RELEASE_NAME
-----------------------
11.5.9 or 11.5.10.2
Q19. What is RRA/FNDFS ?
Ans: Report Review Agent(RRA) also referred by executable FNDFS is default text viewer in Oracle Applications 11i for viewing output files & log files. As most of apps dba's are not clear about Report Server & RRA.
Q20. What is PCP in Oracle Applications 11i ? In what scenarios PCP is Used ?
Ans: PCP stands for parallel Concurrent processing.Usually you have one Concurrent Manager executing your requests but if you can configure Concurrent Manager running on two machines (Yes you need to do some additional steps in order to configure Parallel Concurrent Processing) . So for some of your requests primary CM Node is on machine1 and secondary CM node on machine2 and for some requests primary CM is on machine2 & secondary CM on machine1.
Scenario
********
Well If you are running GL Month end reports or taxation reports annually these reposrts might take couple of days. Some of these requests are very resource intensive so you can have one node running long running , resource intensive requests while other processing your day to day short running requets.
another scenario is when your requests are very critical and you want high resilience for your Concurrent Processing Node , you can configure PCP. So if node1 goes down you still have CM node available processing your requests.
Q21. Output & Logfiles for requests executed on source Instance not working on cloned Instance?
Ans: Here is exact problem description - You cloned an Oracle Apps Instance from PRODBOX to another box with Instance name say CLONEBOX on 1st of August. You can any CM logs/output files after 1st of August only becuase these all are generated on CLONEBOX itself, But unable to view the logs/output files which are prior to 1st August. What will you do & where to check ?
Log , Output file path & location is stored in table FND_CONCURRENT_REQUESTS. Check
select logfile_name, logfile_node_name, outfile_name, outfile_node_name from fnd_concurrent_requests where request_id=&requestid ;
where requestid is id of request for which you are not able to see log or out files. You should see output like
/u01/PRODBOX/log/l123456.req, host1,/u01/PRODBOX/out/
Q22. How to confirm if Report Server is Up & Running ?
Ans: Report Server is started by executable rwmts60 on concurrent manager Node & this file is under $ORACLE_HOME/bin .execute command on your server like
ps -ef | grep rwmts60
You should get output like
applmgr ....... rwmts60 name=REP60_VISION
where VISION is your Instance name.
Else you can submit a request like "Active Users" with display set to PDF, check output & log file to see if report server can display PDF files.
Q23. What is difference between ICM, Std Managers & CRM in Concurrent Manager ?
Ans: # ICM stand for Internal Concurrent Manager, which controls other managers. If it finds other managers down , it checks & try to restart them. You can say it as administrator to other concurrent managers. It has other tasks as well.
# Standard Manager These are normal managers which control/action on the requests & does batch or single request processing.
# CRM acronym for Conflict Resolution Manager is used to resolve conflicts between managers & request. If a request is submitted whose execution is clashing or it is defined not to run while a particular type of request is running then such requests are actioned/assigned to CRM for Incompatibilities & Conflict resolution.
Q24. What is use of Apps listener ? How to start Apps listener ? How to confirm if Apps Listener is Up & Running ?
Ans: Apps Listener usually running on All Oracle Applications 11i Nodes with listener alias as APPS_$SID is mainly used for listening requests for services like FNDFS & FNDSM.
Start
******
In Oracle 11i, you have script adalnctl.sh which will start your apps listener. You can also start it by command
- lsnrctl start APPS_$SID (Replace sid by your Instance SID Name)
Confirm
********
execute below command
lsnrctl status APPS_$SID (replcae SID with your Instance Name)
so If your SID is VISION then use lsnrctl status APPS_VISION out put should be like
Services Summary...
FNDFS has 1 service handler(s)
FNDSM has 1 service handler(s)
The command completed successfully
Q25. What is Web Listener ?
Ans: Web Listener is Web Server listener which is listening for web Services(HTTP) request. This listener is started by adapcctl.sh & defined by directive (Listen, Port) in httpd.conf for Web Server. When you initially type request like http://becomeappsdba.blogspot.
Q26. How will you find Invalid Objects in database ? How to compile Invalid Objects in database ?
Ans: using query
SQLPLUS> select count(*) from dba_objects where status like 'INVALID';
Compile
********
- using ADADMIN
- using utlrp.sql which is shipped with Oracle.
Q27. How to compile JSP in Oracle Apps ?
Ans: Using ojspCompile.pl perl script shipped with Oracle apps to compile JSP files. This script is under $JTF_TOP/admin/scripts. Sample compilation method is
perl -v ojspCompile.pl --compile --quiet
Q28. What is difference between adpatch & opatch ? Can you use both adpatch & opatch in Apps ?
Ans: Yes , we can use both adpatch and opatch in Apps. adpatch is an ad utility used for applying apps patches, whereas opatch is a utility used to apply rdbms patches.
Q29. Where will you find forms configuration details apart from xml file ? What is forms server executable Name ?
Ans: Forms configuration at time of startup is in script adfrmctl.sh and appsweb_$CONTEXT_NAME.cfg (defined by environment variable FORMS60_WEB_CONFIG_FILE) for forms client connection used each time a user initiates forms connection.
- f60srvm is the forms executable name.
Q30. What are different modes of forms in which you can start Forms Server and which one is default ?
Ans: There are two modes in which we can start forms.
- Socket Mode
- Servlet Mode.
By Default forms are configured to start in socket mode.
Q31. How you will start Discoverer in Oracle Apps 11i ?
Ans: In order to start dicoverer you can use script addisctl.sh under $OAD_TOP/admin/scripts/$
or startall.sh under $ORACLE_HOME/discwb4/util (under Middle/Application Tier)
Q32. How many ORACLE HOME are Oracle Apps and whats significance of each ?
Ans: There are three $ORACLE_HOME in Oracle Apps, Two for Application Tier (Middle Tier) and One in Database Tier.
# ORACLE_HOME 1 : On Application Tier used to store 8.0.6 techstack software. This is used by forms, reports & discoverer.
ORACLE_HOME should point to this ORACLE_HOME which applying Apps Patch.
# ORACLE_HOME 2: On Application Tier used by iAS (Web Server) techstack software. This is used by Web Listener &
contains Apache.
# ORACLE_HOME 3: On Database Tier used by Database Software usually 8i,9i or 10g database.
Q33. Where is HTML Cache stored in Oracle Apps Server ?
Ans: Oracle HTML Cache is available at $COMMON_TOP/_pages for some previous versions you might find it in $OA_HTML/_pages
Q34. Where is plssql cache stored in Oracle Apps ?
Ans: sually two type of cache session & plssql stored under $IAS_ORACLE_HOME/Apache/
Q35. What happens if you don't give cache size while defining Concurrent Manager ?
Ans: Lets first understand what is cache size in Concurrent Manager. When Manager picks request from FND CONCURRENT REQUESTS Queues, it will pick up number of requests defined by cache size in one shot & will work on them before going to sleep. So in my views if you don't define cache size while defining CM then it will take default value 1, i.e. picking up one request per cycle.
Q36. What are few profile options which you update after cloning ?
Ans: Rapid clone updates profile options specific to site level . If you have any profile option set at other levels like server, responsibility, user....level then reset them.
- Site Name
Q39. How to retrieve SYSADMIN password ?
Ans: If forgot password link is enabled and sysadmin account is configured with mail id user forget password link else you can reset sysadmin password via FNDCPASS.
Q40. If you have done two node Installation, First machine : Database and concurrent processing server. 2nd machine: form,web Which machine have admin server/node?
Ans: Admin server will always reside on machine where Concurrent Processing Resides.
Q41. What is GWYUID, Where GWYUID defined & what is its used in Oracle Applications ?
Ans: GWYUID , stands for Gateway User ID and password. Usually like APPLSYSPUB/PUB
GWYUID is defined in dbc i.e. Database Connect Descriptor file . It is used to connect to database by think clients.
Q42. Whats is TWO_TASK in Oracle Database ?
Ans: TWO_TASK mocks your tns alias which you are going to use to connect to database. Lets assume you have database client with tns alias defined as PROD to connect to Database PROD on machine teachmeoracle.com listening on port 1521. Then usual way to connect is sqlplus username/passwd@PROD ; now if you don't want to use @PROD then you set TWO_TASK=PROD and then can simply use sqlplus username/passwd then sql will check that it has to connect to tnsalias define by value PROD i.e. TWO_TASK
Q43. What is difference between GUEST_USER_PWD (GUEST/ORACLE) & GWYUID ?
Ans: GUEST_USER_PWD(Guest/Oracle) is used by JDBC Thin Client where as GWYUID is used by Thick Clients like via Forms Connections.
Q44. How to check number of forms users at any time ?
Ans: Forms Connections initiate f60webmx connections so you can use
ps -ef | grep f60webmx | wc -l
Q45. What is 0 & Y in FNDCPASS, FNDLOAD or WFLOAD ?
Ans: 0 & Y are flags for FND Executable like FNDCPASS & FNDLOAD where
0 is request id (request ID 0 is assigned to request ID's which are not submitted via Submit Concurrent Request Form.
'Y' indicates the method of invocation. i.e. it is directly invoked from the command-line not from the Submit Request Form.
Q46. In a Multi Node Installation, How will you find which node is running what Services ?
Ans: You can query for table FND_NODES and check for column , SUPPORT_CP ( for Concurrent Manager) SUPPORT_FORMS ( for forms server) , SUPPPORT_WEB (Web Server), SUPPORT_ADMIN( Admin Server), and SUPPORT_DB for database tier.
You can also check same from CONTEXT File (xml file under APPL_TOP/admin)
Q47. If your system has more than one Jinitiator, how will the system know, which one to pick. ?
Ans: When client makes a forms connection in Oracle Applications, forms client session uses configuration file defined by environment variable FORMS60_WEB_CONFIG_FILE also called as appsweb config file. These days this file is of format appsweb_$CONTEXT.cfg The initiator version number defined by parameter jinit_ver_name in this file will be used
Q48. While applying Apps patch using adpatch, if you want to hide the apps password, how will that be possible ?
Ans: using flags=hidepw
Q49. What is importance of IMAP Server in Java Notification Mailer ?
Ans: IMAP stands for Internet Message Access Protocol and Java Notification mailer require IMAP server for Inbound Processing of Notification Mails.
Q50. What is difference between Socket & Servlet Mode in Apps Forms ?
Ans: When forms run SOCKET Mode these are dedicated connection between Client Machine & Form Server (Started by adfrmctl.sh). When Forms run in servlet mode the forms requests are fulfilled by Jserv in Apache . There will be additional JVM for Forms Request in that case and you won't start form via adfrmctl.sh.
Q51. a. How to find OUI version ?
b. How to find Database version ?
c. How to find Oracle Workflow Cartridge Release Version ?
d. How to find opatch Version ?
e. How to find Version of Apps 11i ?
f. How to Discoverer Version installed with Apps ?
g. How to find Workflow Version embedded in Apps 11i ?
h. How to find version of JDK Installed on Apps ?
Ans: OUI
***
OUI stands for Oracle Universal Installer. In order to find Installer version you have to execute ./runInstaller -help ( From OUI location)
You will get output like
Oracle Universal Installer, Version 10.1.0.4.0 Production Copyright (C) 1999, 2005, Oracle. All rights reserved.
That means OUI version in above case is 10.1.0.4
OUI location is $ORACLE_HOME/oui/bin
DB
**
select * from v$version;
Oracle Workflow
***************
Log in to the database as the owf_mgr user and issue
select wf_core.translate('WF_VERSION'
Opatch
*******
$ORACLE_HOME/OPatch/opatch version
Apps
****
select RELEASE_NAME from fnd_product_groups;
Discoverer
**********
Discoverer with Apps installed in ORACLE_HOME same as 806 is usually 3i or 4i. To find Version login to Application Tier & go to $ORACLE_HOME/discwb4/bin and execute
strings dis4ws | grep -i 'discoverer version'
Workflow embedded in 11i
************************
Run following SQL from apps user ;
SQL>select TEXT from WF_RESOURCES where NAME='WF_VERSION';
You should see output like
TEXT
-----------------------
2.6.0
Which means you are on Workflow Version 2.6.0
You can also use script wfver.sql in FND_TOP/sql to find version of workflow in Apps.
JDK in Apps
***********
There might be multiple JDK installed on Operating System . Like JDK 1.3.1, 1.4.2 or 1.5 but in order to find which Version of JDK your Apps is using
Open your Context File $SID_$HOSTNAME.xml under $APPL_TOP/admin and look for variable
JDK_TOP oa_var="s_jdktop" what so ever value assigned against that parameter go to that directory & cd bin & execute command
./java -version so lets assume entry above is /usr/jdk then cd /usr/jdk/bin & ./java -version , you will see output like
java version "1.4.2_10"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_10-b03)
Java HotSpot(TM) Client VM (build 1.4.2_10-b03, mixed mode)
Which means you are using JDK 1.4.2 in Oracle Applications 11i.
Q52. If by mistake you/someone deleted FNDLIBR can this executable be restored if Yes, How & if no, what will you do ?
Ans: Yes, you can restore FNDLIBR executables
Run adadmin on concurrent manager node
select option 2. Maintain Applications Files menu
then select 1. Relink Applications programs
when prompts for
Enter list of products to link ('all' for all products) [all]
select FND
when prompt for
Generate specific executables for each selected product [No] ? YES
select YES
& from list of executables select FNDLIBR
This will create new FNDLIBR executables.
Q53. What is .pls files which you see with apps ?
Ans: pls file stands for plsql files. In apps patch these files contain code to create package spec or package body or both.
Q54. What are .ldt & .lct files which you see in apps patch or with FNDLOAD ?
Ans: .ldt & .lct stands for Loader datafile & Loader configuration files, used frequently in migrating customization, profile options, configuration data, etc.. across Instances.
Q55. What are .odf file in apps patch ?
Ans: odf stands for Object Description Files used to create tables & other database objects.
Q56. What to find Form Server log files in forms ?
Ans: Form Server Start up log file default location is $OAD_TOP/admin/log/$CONTEXT_
Forms Run Time Diagnostics default location is $ORACLE_HOME/forms60/log/$
Q57. How to convert pll to pld file or pld file to pll ?
Ans: Pll->Pld f60gen module=MSCOSCW3.pll module_type=library userid=apps/ module_access=file output_file=MSCOSCW1.pld script=yes
Pld -> pll f60gen module=MSCOSCW3.pld userid=apps/ module_type=library module_access=file output_file=MSCOSCW1.pll parse=y batch=yes compile_all=special
Q58. Is APPS_MRC Schema exists for MRC in 11.5.10 and higher ?
Ans: No , apps_mrc schema is dropped with 11.5.10 Upgrade & 11.5.10 new Install. This is replaced by more Integrated Architecture.
Q59.If APPS_MRC schema is not used in 11.5.10 and higher then How MRC is working ?
Ans: For products like Payable, Recievables which uses MRC and if MRC is enabled then each transaction table in base schema related to currency now has an assoicated MRC Subtables.
Q60. When you apply C driver patch does it require database to be Up & Why ?
Ans: Yes , database & db listener should be Up when you apply any driver patch in apps. even if driver is not updating any database object connection is required to validate apps & other schema and to upload patch history information in database tables.
Q61. Can C driver in apps patch create Invalid Object in database ?
Ans: No , C driver only copies files in File System. Database Object might be invalidated during D driver when these objects are created/dropped/modified.
Q.62 Why does a worker fails in Oracle Apps Patch and few scenarios in which it failed for you ?
Ans: This question sounds stupid but this is asked quite often in Apps DBA Interview. Apps Patch worker can fail in case it doesn't find expected data, object, files or any thing which driver is trying to update/edit/modify. Possible symptoms may be underlying tables/objects are invalid, a prereq patch is missing , login information is incorrect, inconsistency in seeded data...
Q63. What is dev60cgi & f60cgi ?
Ans: cgi stands for Common Gateway Interface and these are Script Alias in Oracle Apps used to access forms server . Usually Form Server access directly via http://hostname:port/dev60cgi/
Q64. What is difference between mod_osso & mod_ose in Oracle HTTP Server ?
Ans: mod_osso is Oracle Single Sign-On Module where as mod_ose is module for Oracle Servlet Engine.
mod_osso is module in Oracle's HTTP Server serves as Conduit between Oracle Apache Server & Singl Sign-On Server where as mod_ose is also another module in Oracle's HTTP Server serves as conduit between Oracle Apache & Oracle Servlet Engine.
Q65. What is difference between COMPILE_ALL=SPECIAL and COMPILE=ALL while compiling Forms ?
Ans: Both the options will compile all the PL/SQL in the resultant .FMX, .PLX, or .MMX file but COMPILE_ALL=YES also changes the cached version in the source .FMB, .PLL, or .MMB file. This confuses version control and build tools (CVS, Subversion, make, scons); they believe you've made significant changes to the source. COMPILE_ALL=SPECIAL does not do this.
Q66. What is ps -ef or ps command in Unix ? for work ex < 1 yr
Ans: ps is unix/linux utility or executable to find status of process. Used mainly to find if services/process is running or not.
Q67. What is GSM in Oracle application E-Business Suite ?
Ans: GSM stands for Generic Service Management Framework. Oracle E-Business Suite consist of various compoennts like Forms, Reports, Web Server, Workflow, Concurrent Manager ..
Earlier each service used to start at their own but managing these services (given that) they can be on various machines distributed across network. So Generic Service Management is extension of Concurrent Processing which manages all your services , provide fault tolerance (If some service is down ICM through FNDSM & other processes will try to start it even on remote server) With GSM all services are centrally managed via this Framework.
Q68. What is FNDSM ?
Ans: FNDSM is executable & core component in GSM ( Generic Service Management Framework discussed above). You start FNDSM services via APPS listener on all Nodes in Application Tier in E-Business Suite.
Q69. What is iAS Patch ?
Ans: iAS Patch are patches released to fix bugs associated with IAS_ORACLE_HOME (Web Server Component) Usually these are shiiped as Shell scripts & you apply iAS patches by executing Shell script. Note that by default ORACLE_HOME is pointing to 8.0.6 ORACLE_HOME and if you are applying iAS patch export ORACLE_HOME to iAS . You can do same by executing environment file under $IAS_ORACLE_HOME
Q70. If we run autoconfig which files will get effected ?
Ans: n order to check list of files changes during Autoconfig , you can run adchkcfg utility which will generate HTML report. This report will list all files & profile options going to change when you run AutoConfig.
Q71. What is difference between .xml file & AutoConfig ?
Ans: Autoconfig is Utility to configure your Oracle Application environment. .xml file is repository of all configuration from which AutoConfig picks configuration and polulates related files.
Q72. What is .lgi files ?
Ans: gi files are created with patching along with .log files . .lgi files are informative log files containing information related to patch. You can check .lgi files to see what activities patch has done. Usually informative logs.
Q73. How will you skip worker during patch ?
Ans: f in your adctrl there are six option shown then seventh is hidden option.(If there are seven options visible then 8th option is to Skip worker depending on ad version).
Q74. Which two tables created at start of Apps Patch & drops at end of Patch ?
Ans: FND_INSTALLED_PROCESSES &AD_DEFFERED_JOBS are the tables that get updated while applying a patch mainly d or unified driver.
Q75. How to compile an Oracle Reports file ?
Ans: Utility adrepgen is used to compile Reports. Synatx is given below
adrepgen userid=apps\ source = $PRODUCT_TOP\srw\filename.rdf dest=$PRODUCT_TOP\srw\
Q76. What is difference between AD_BUGS & AD_APPLID_PATCHES ?
Ans: AD_BUGS holds information about the various Oracle Applications bugs whose fixes have been applied (ie. patched) in the Oracle Applications installation.
AD_APPLIED_PATCHES holds information about the "distinct" Oracle Applications patches that have been applied. If 2 patches happen to have the same name but are different in content (eg. "merged" patches), then they are considered distinct and this table will therefore hold 2 records.
Q77. What exactly happens when you put an Oracle Apps instance in maintenance mode ?
Ans: Maintenance mode provides a clear separation between normal runtime operation of Oracle Applications and system downtime for maintenance. Enabling the maintenance mode feature
a) shuts down the Workflow Business Events System and
b) sets up function security so that no Oracle Applications functions are available to users.
Used only during AutoPatch sessions, maintenance mode ensures optimal performance and reduces downtime when applying a patch. (Source Metalink Note: 233044.1)
Q78. What is profile options, What are various type of profile options ?
Ans:
Q79. If users complaining Oracle Applications 11i system is running slow , what all things you will check at broad level ?
Ans:
Q80. Why appsutil directory under Database ORACLE_HOME used for ?
Ans: All the template files, startup scripts , XML files are maintained here .
Q81. How to create User in Oracle Applications 11i ? Can you delete a User ?
Ans: New User can be created using security-->Define-->User menu. No , user cannot be deleted but can be end-dated.
Q82. What is Single Sign On ? ( If you are using portal 3.0.9 or 10G )?
Ans: As name says Single-Sign On Server is set of services (Software) which enables login to Application once which will allow you to login to Ppartner Applications with no need to login again. Lets assume I have configured single SSO Server for Portal , E-Business Suite, Collaboration Suite plus some other other applications, Now if I login to any one of them & after that if I wish to login to other applications I should be able to login without supplying passwords again.
Q83. How to configure portal with 11i ? ( If you are using portal 3.0.9 or 10G )?
Q84. What is content of dbc file & why its important ?
Ans: DBC file is quite important as whenever Java or any other program like forms want to connect to database it uses dbc file. Typical entry in dbc file is
GUEST_USER_PWD
APPS_JDBC_URL
DB_HOST
Q85. There are lot of dbc file under $FND_SECURE, How its determined that which dbc file to use from $FND_SECURE ?
Ans: This value is determined from profile option "Applications Database ID".
The name can be picked from s_dbc_file_name in XML file.
Q86. Info Regarding Inventory.
Ans: What is oraInventory ?
oraInventory is repository (directory) which store/records oracle software products & their oracle_homes location on a machine. This Inventory now a days in XML format and called as XML Inventory where as in past it used to be in binary format & called as binary Inventory.
There are basically two kind of Inventory Global Inventory (also called as Central Inventory) and Local Inventory also called as Oracle Home Inventory.
Global Inventory ?
Global Inventory holds information about Oracle Products on a Machine. These products can be various oracle components like database, oracle application server, collaboration suite, soa suite, forms & reports or discoverer server . This global Inventory location will be determined by file oraInst.loc in /etc (on Linux) or /var/opt/oracle (solaris). If you want to see list of oracle products on machine check for file inventory.xml under ContentsXML in oraInventory (Please note if you have multiple global Inventory on machine check all oraInventory directories)
You will see entry like
HOME NAME="ORA10g_HOME" LOC="/u01/oracle/10.2.0/db" TYPE="O" IDX="1"/
...
...
Local Inventory ?
Inventory inside each Oracle Home is called as local Inventory or oracle_home Inventory. This Inventory holds information to that oracle_home only.
Can I have multiple Global Inventory on a machine ?
- Quite common questions is that can you have multiple global Inventory and answer is YES you can have multiple global Inventory but if your upgrading or applying patch then change Inventory Pointer oraInst.loc to respective location. If you are following single global Inventory and if you wish to uninstall any software then remove it from Global Inventory as well.
What to do if my Global Inventory is corrupted ?
- No need to worry if your global Inventory is corrupted, you can recreate global Inventory on machine using Universal Installer and attach already Installed oracle home by option
-attachHome
./runInstaller -silent -attachHome -invPtrLoc $location_to_oraInst.loc
ORACLE_HOME="Oracle_Home_
CLUSTER_NODES="{}"
Do I need to worry about oraInventory during oracle Apps 11i cloning ?
- No, Rapid Clone will update both Global & Local Inventory with required information , you don't have to worry about Inventory during Oracle Apps 11i cloning.
Q87. What is the database holding Capacity of Oracle ?
- database holding capacity of oracle 9i is 512 pb(peta bytes)
- database holding capacity of oracle 10 g is 8 trillion tera bytes
Q88. How to find Operation System Version (Unix/Linux) ?
For solaris use command
uname -a
You will see output like
For Solaris SunOS servername 5.8 Generic_117350-23 sun4u sparc SUNW,Sun-Fire-V240
For RedHat Linux use command
cat /etc/*release*
You will see output like
Red Hat Enterprise Linux AS release 3 (Taroon Update 6)
Which means you are on Solaris 5.8 or Linux AS 3 resp.
Q89. How to find if your Operating System is 32 bit or 64 Bit ?
For solaris use command
isainfo -v
If you see out put like
32-bit sparc applications
That means your O.S. is only 32 bit but if you see output like
64-bit sparcv9 applications
32-bit sparc applications
above means your o.s. is 64 bit & can support both 32 & 64 bit applications
Q90. Can I run 64 bit application on 32 bit Operating system ?
You can run 32 bit application (like oracle application server, web server, all oracle application server are 32 bit ) on both 32 /64 bit operating system but a 64 bit application like 64 bit database can run only on 64 bit operating system.
Q91. How to find if your database is 32 bit or 64 bit(Useful in applying Patches) ?
execute "file $ORACLE_HOME/bin/oracle" , you should see output like
/u01/db/bin/oracle: ELF 64-bit MSB executable SPARCV9 Version 1
which means you are on 64 bit oracle
If your oracle is 32 bit you should see output like
oracle: ELF 32-bit MSB executable SPARC Version 1
Now you know what should be bit of patch to download
Wednesday, July 29, 2009 | Posted by vungaralas at 11:41 PM 0 comments
1.APPSDBA-INTERVIEW QUESTIONS
1)List out the Configuration files of all the Components of an Oracle Application
2)List out the Log files of all the components of an Oracle Application
3)List out the Executables of all the components of an Oracle application
4)List out the methods to identify whether the Component of application is running or not
5)List out the Ports of all the components
6)List out the method to start up all the components of oracle application
7)What is the application used for in your business
8)Provide the complete path to access the Oracle application
9)List out the steps to verify how each component's function can be verified from front end
10)What is the latest level of ATG,ADX,TXK,AD
11)What is the patcheset level of ATG,ADX,TXK,AD of your application
12)How do you verify the Versions of the components from both front end and backend
13)What is the size of your database
14)How many tablespaces are available in your database
15)How many datafiles are available in your database
16)What type of tablespace management in your database
17)What type of backups do you take, how and when
18)How many filesystems you have
19)How many nodes are available in your application
20)How many instances do you support and what are they
21)How do you identify whether a particular component is running on a node or not
22)How do you make changes to component
24)Where are the worker log files located
25)Where are the patch log files located
26)Where are the adadmin related log files located
27)What are your daily activities
28)How many patches do you apply per day and on what environment
29)What are the various sizes of patches that you applied
30)What is the latest patch that you applied
31)How do your rollback and application patch
32)How do you apply developer patch
33)How do you rollback an iAS patch
34)How many languages are installed on your application
35)What is multi currency
36)What is Multi Org
37)Where are the errors of Oracle background processes recorded
38)Where are the errors of Oracle database engine recorded
39)Where are the errors of apache written
40)What are datafixes
41)How do you verify the list of patches applied to database engine
42)How do you verify the list of patches applied to your application
43)How do you manually generate a form
44)How do you manually generate a report
45)How do you verify the version of a particular report
46)What are the different self service responsbilities
47)How do you verify the profile options from both front end and backend
48)How do you create an application user
49)How do you create a custom concurrent program
50)How do you enable trace for a db session
51)How do you verify what an db session is doing
52)How do you verify what an os process is doing
53)How do you identify the No. of forms sessions connected to db
54)How do you verify the No. of jdbc connection sessions connected to db
55)How many users use the application
56)How many concurrent programs run daily
57)How do you collect statistics for your database
58)What is RDA and how do you run diagnostics for application/database
59)How do you enable trace for database,db session, listener, apache,concurrent manager,forms,reports, a form
60)How do you verify locks & Blocks
61)How do you run AWH,ADDR reports
62)What is tkprof
63)What is dbverify
64)How do you identify that a db file is corruputed
65)How do you create a concurrent manager
66)How do increase concurrent manager
67)How do you verify concurrent requests
68)What are the different status of concurrent requests
69)What are the different env variables required for running of your application
70)What are the different oracle engine errors and how do you resolve
71)How do you schedule a concurrent program
72)How do you verify how many concurrent programs are running daily
73)What is the difference between a concurrent program and concurrent request
74)What is a database link
75)How do you create a database link
76)How do you compile a view
77)How do you verify view definition
78)What is difference between crash recovery and instance recovery
79)How do you compile invalids
80)How do verify errors related to view
81)How do you verify procedure/package definition
82)How do you compile a trigger
83)How do you compile a package
84)How do you create a custom database user
85)How do you compile jsps
86)How do you verify forms runaway session
87)How do you verify the history of CPU Usage
88)What is the difference between utlirp and utlrp
89)How do you verify the shared pool usage
90)What is tkprof and how do you use
91)What is dbms _stats and what is its importance
92)How do you analyze your application
93)How do you change password of guest user
94)How do you change password of apps
95)What is an event trace
96)How do enable/disable event trace
97)What are the different patching errors that you have faced
99)How do you run autoconfig on db node
100)How do you identify a shared appltop and shared techstack
Posted by vungaralas at 11:33 PM 0 comments
Labels: 1.APPSDBA-INTERVIEW QUESTIONS
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