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Image Copies VS BackupSets
Difference between Image Copies and BackupSets (RMAN): Image Copies could be of two types: 1. RMAN Image Copies 2. O.S Image Copies RMAN Image Copies Use the RMAN copy command to create an image copy....
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DB_BLOCK_CHECKING, DB_BLOCK_CHECKSUM and
Well there are whole lot of changes when you start comparing Oracle 10g and 11g. DB_ULTRA_SAFE is one of the new parameter introduced in 11g which provides a mechanism to avoid block corruptions in...
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Enterprise Cloud Infrastructure for Dummies (Oracle Special Edition – PDF...
Get your own copy of Enterprise Cloud Infrastructure for Dummies, Oracle Special Edition. Source: Oracle.com Link:...
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What are Standby Redo log Files in Data Guard Environment ?
What are Standby Redo Log Files and why they are important ? Recently asked by one of my good Fried Sowmya about some internals of Standby Redo Log Files and soon i found myself in bit of soreness. So,...
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Oracle Data Guard Evolution.
Oracle Data Guard’s Improvements from Version 8i (Introduced in same version) till now: ORACLE 8i ————————- * Read-Only Standby Database * Managed recovery * Remote archiving redo log files ORALCE 9i...
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Database Migration vs Upgrade ?
While talking with one of the new DBA found him uncomfortable & perplexed when started discussing Database Migration and Upgrade activities. Well i’ve seen that there are so many confusions...
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Questions ??
Let’s discover more about Data Guard 11g and discuss some of the topics out of the ocean named Data Guard. Query Scn in case of Active Data Guard ? Fast-Start when using Maximum Performance Model … ?...
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DBID (nid) Utility *A Powerfull Weapon in DBA’s Arsenal*
We should be thankful to that almighty that we are living an age where we have Oracle Database 10g and further releases available, If we’re not then changing some of the internal identifiers like...
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Patching Explained
Patching A patch is a piece of software designed to fix problems with, or update a computer program or its supporting data. This includes fixing security vulnerabilities and other bugs, and improving...
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What and Why CatBundle.sql ?
What is a Catbundle.sql script and it’s purpose after patching (Part of PSU Post-Patching) ? Before asnwering about the role or importance of catbundle.sql script i would like to explain about what a...
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ADDM Report Test Sample
Below provided is the sample ADDM (Automatic Database Diagnostic Monitor) from one of my Test Database. Before that i would like to explain what is this ADDM and it’s advantages: To view in more...
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EMCTL Error (OC4J Configuration Issue)
Noticed that some of my test databases monitored in OEM Grid Control started showing status of ‘Agent Unreachable’. This is what we are getting when we tried checking status of the Agent on the servers...
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Database Upgrade (Oracle 10R2 or 11.2.0.1 to Oracle 11gR2(11.2.0.2/3)
Describing pre/post checklist and upgrade process details for upgrading a Oracle 10R2 or 11.2.0.1 to Oracle 11gR2(11.2.0.2/3) Please check OS version as upgrade is only certified for RH 5. cat...
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Me explaining PGA & UGA.
• Program global area (PGA) PGA is memory specific to operating process that is not shared by other processes in the system. Because PGA is process specific, it is never allocated in the SGA. Access to...
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11.2.0.3.4 (Why so many 1′s, 2′s, 3′s and 4′s)
Why we have so many numbers (1,2,3,4) in 11.2.0.3.4 ?. Alright, today I’ll try to explain significance of these numbers and it’s relevance. 11.X .X. X.X Major Database Release Number: Major database...
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How To Relink Oracle Binaries.
Relinking occurs automatically under these circumstances: - An Oracle product has been installed with an Oracle provided installer. - An Oracle patch set has been applied via an Oracle provided...
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Snapshot ControlFile in RAC Systems and related errors (ORA-00245)
Even after a good Database Upgrade plan one can face issues related to performance, Functionailities, Backups etc. Today I’m going to discuss one of the case that was happened during a production...
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Oracle 12c (12.1.0.1) is officially released.
Finally the long wait is over, 12c (12.1.0.1) has released and is available on Oracle official website to download and test. Link:...
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Index Fragmentation / Rebuild. When ?
How to find index is fragmented? First analyze index SQL>analyze index INDEX_NAME validate structure; Then query INDEX_STATS view 1. If del_lf_rows/lf_rows is > .2 then index should be rebuild....
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