Oracle RDBMS Server Articles
Submitted by Mohammad taj on Sat, 2008-04-19 07:39
In this article we focus on How to migrate existing database to ASM.
Login to SYSDBA user and alter below three parameter for controlfile,datafile or FRA location with SPFILE option.
1. First need to set below parameter for controlfile,datafile or FRA.
NOTE: I have two disk group here I am using "DGRP2" disk group.
SQL> alter system set control_files='+DGRP2' scope=spfile;
SQL> alter system set db_create_file_dest='+DGRP2' scope=spfile;
Submitted by reddy_uk on Mon, 2007-12-03 14:09
Oracle RDBMS Server - Enterprise Edition - Version: 10.2.0.2
OS: Applies to any OS, But this is tested on AIX5.3L
Moving Data between Disk groups
Submitted by Mohammad taj on Sat, 2007-11-17 09:18
When rows are not stored contiguously, or if rows are split onto more than one block, performance decreases because these rows require additional block accesses.
Note that table fragmentation is different from file fragmentation. When a lot of DML operations are applied on a table, the table will become fragmented because DML does not release free space from the table below the HWM.
Submitted by mrvilas1 on Fri, 2007-09-28 07:40
The LIKE-clause can ignore indexes, causing queries to run forever while doing full table scans. This document describes how to tune such SQL statements by making use of Oracle Text or reverse key indexes.
Submitted by vjain on Fri, 2007-07-13 22:47
A materialized view that is verified to be fast refresh should update relatively fast. But, what happens when there are few changes to the master table, no network issues, no aggregation in the snapshot query and the refresh still runs slow?
Submitted by sethunathu on Thu, 2007-07-05 01:12
It is always a puzzle for a DBA to look into the user's complaint of getting "ORA-01555 Snapshot too old : rollback segment number x with name "_SYSSMUx$" too small " error. You have looked into the database. If your UNDO_MANAGEMENT is set to AUTO, you can not do anything to size the rollback segments manually since it is being managed by oracle. All the associated tables and indexes have been analyzed and statistics are up to date. The undo tabelspace is almost full. You may advise the user that there should be frequent commits (if it is a data loading process) or if there is a long running query and other users change the data that is being selected by the query, this can happen and in that case, if possible, advise the user not to run these two at the same time.
Submitted by Mohammad taj on Sat, 2007-06-16 08:56
This article describes the procedure to install the April 2007 CPU patch on Oracle Database Release 10.1.0.5. The Patch Number is p5907304_10105_WINNT.zip
Submitted by Mohammad taj on Thu, 2007-06-14 01:12
This article describes the process of upgrading the Oracle Database Server 10g Release 10.1.0.2 to Oracle Database 10g Release 10.1.0.5 on Windows XP SP2.
Submitted by Pankaj Chandiramani on Wed, 2007-05-16 12:43
Caution: This method is for Testing & Learning purposes only.
Most of the Oracle 10g databases are using ASM for storage as it's very simple to maintain the storage w.r.t. to Disks, Datafiles etc.
Submitted by saibal on Thu, 2007-05-10 02:05
Oracle 10g’s brilliant alternative to database point in time recovery is the the Flashback Database feature. With this feature in place you can do almost everything that you can with point in time recovery, without actually having to go through all the disruptions and hassle that a PITR necessarily entails.I recently had a first hand opportunity to see the power of this feature, when I ran a scriptfile to drop tables and unwittingly dropped one of the tables containing sensitive information belonging to my employer Creative Infotech. I later recovered the table and was amazed at seeing how easy it had become to get back dropped objects in Oracle 10g, especially Release 2. Below is a simplified version of what I did