Blogs on Oracle DBA / Temenos T24 - Deepak Kumar

Download Oracle database software. You can download Oracle database software from the link http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html ·          You will need an OTN account to download this software. (It’s a free signup) ·          You can create an account with the link https://login.oracle.com/mysso/signon.jsp ·          You can use this software free for personal educational purpose. ·          You can only download current release (which is 12c) and the previous release (which is 11g) ·          If you require older version you will need Oracle Support account (which is paid account). Note : You can download various other software from Oracle free for educational purpose.

·       *    In a server if there is a listener running, then an Oracle database can dynamically register it in the listener to provide its service. ·        *  This dynamic registration is automatic if the listener is running in the Oracle default listening port 1521 ·        *   Incase if you want to allow dynamic database registration only to certain databases in the server. You need to run the listener in non-default port. (For example: 1522 or 1530 etc) ·        *   To allow dynamic registration of database services in the listener with non-default port we need to modify few parameters in database level. No changes needed in listener.ora file. Below are the parameters o    In case if the listener and database are in same server change the parameter LOCAL_LISTENER For example: Alter system set local_listener=”orclnew” scope=both; Where listener2 should be r...

Archivelog mode is a must for a production database as it ensures high recoverability of the database and provides greater flexibility to backup. Its very simple to turn on archiveing of Redo logs in your database. First step is check the log mode of the database. There are two ways to check this. First way is to query the column LOG_MODE from v$database. sys@ORCL> select log_mode from v$database; LOG_MODE ------------ NOARCHIVELOG sys@ORCL> sys@ORCL> Second way is to use the command ARCHIVE LOG LIST sys@ORCL> archive log list Database log mode              No Archive Mode Automatic archival             Disabled Archive destination            USE_DB_RECOVERY_FILE_DEST Oldest online log sequence     51 Current log sequence        ...

      ORA-01092 & ORA-30040 ·          Mount the database. ·          Create a pfile from spfile to a desired location. For example CREATE PFILE = ‘f:\temp\test\initorcl.ora’ from spfile; ·          Edit the pfile and give an online tablespace *.undo_tablespace='UNDOTBS3' already existing. ·          Start the database with this new Pfile, for example STARTUP PFILE=’F:\TEMP\TEST\initorcl.ora’ ·          Create spfile from the new pfile settings loaded using the command “CREATE SPFILE FROM PFILE;” ·          Bounce the database.

SP2-1503 Error Oracle 11g. SP2-1503 : Unable to initialize Oracle call interface. SP2-0152: ORACLE may not be functioning properly. This error is due to version mismatch between the binaries of the sqlplus called and the listener, instance running in the server. Action taken : The system contained 2 Oracle homes as shown below The environment variable “Path” contained the bin path of both the installation. Note that we try to start 10g, but the bin path of 11g comes first in the “Path” variable. As a result of this, version mismatch happened during the call. The sqlplus called is 10g and the listener called is in 11g. Due to this version mismatch problem, we faced the error SP-1503. Modify the path variable and remove the bin path of 11g and try again. Or you can change the order of bin path. Lsnrctl of 10g is now started correctly. The instance will start correctly now.

The flow is * First you need to create a cluster. * Then create tables that need to be clustered by using the newly created cluster. The idea of clustered table is to minimize space used by a group of tables by clustering column that occur commonly in these tables. Suppose there are 3 tables namely T1, T2, T3 and they all have a column named Emp_ID with the same values, then clustering these table using this column Emp_ID reduce space occupied by the column. This column will be stored only one time in a cluster instead of storing in 3 tables. Here is the command to create a cluster create cluster test_cluster (Emp_ID varchar2(32)); Create the tables that need to clustered by using the above created cluster. create table T1 (Col1 varchar2(100), Emp_ID varchar2(32)) cluster test_cluster(Emp_ID); create table T2 (Col1 varchar2(100), Emp_ID varchar2(32)) cluster test_cluster(Emp_ID); etc. Make sure you match the type of the cluster column a...

I am recently getting some knowledge in T24 performance tuning. I will share some of my experience from my work while creating reports for APAP * Never put a select blindly on heavily populated tables like ACCOUNT, CUSTOMER etc * Even a medium sized bank have nearly 1 million records in the ACCOUNT table (including the internal accounts.). Blind selects on tables like these will never return. * Index highly queried columns of the most common tables like CUSTOMER, ACCOUNT, CARD/ISSUE etc.. * Make sure you index only the necessary fields only. If you index large number of fields, it will inturn kill the server, as every commit on the table need to update all the indexes. * Its better to use more robust databases like Oracle DB or SQL Server DB as the backend database instead of JBase as they have better performance. * If you are writing a nofile enquiry never do a SSELECT if you need sorted output. Instead finish the processing of the output array and sort the array using the SOR...