A Hitchhikers View Of The Oracle Underground Raghav Vinjamuri

2 About This Presentation  Purpose Given a vast repertoire of tools and techniques for Proactive Oracle Maintenance - everyone has their own favorite tools, keywords and.. buzzwords. This presentation provides a view for a selection of tools and techniques that are uncommon or “in various stages of implementation”.. in an Oracle DB env.

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Raghav Vinjamuri4 #7 – Speed Up Backups.. 1 Question: Name some options for speeding up backups using RMAN? Thoughts: Get faster CPU, disk.. Faster everything. Seriously ?

Raghav Vinjamuri5 #7 - Speed Up Backups.. 2 Thoughts: Incremental backup strategy RMAN Block Change Tracking Block change tracking causes only the changed database blocks to be flagged in a special file. Mostly everyone uses a Incremental Strategy Yet not many use BCT – why? Use ASM

Raghav Vinjamuri6 #7 - Speed Up Backups.. 3 Considerations: Needs a Block Change Tracking file – that can be created dynamically at any time. Even when the db is open.

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8 #6 – Speed Up Recovery/Restore.. 1 Question: How to speed up recovery and restore? Thoughts: Get a superfast IO subsystem

Raghav Vinjamuri9 #6 – Speed Up Recovery/Restore.. 2 Answer: Use Restore points and Flash Recovery Logs Provides a feature wherein a reset can be performed to the same restore points. (see demo). Vastly speeds up qa refresh times (and, mitigates operational errors).

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Raghav Vinjamuri11 #5 – Recover a small table.. 1 Question: How do you recover a small ‘mostly static data’ table? Given that, - a backup + all archivelogs available - however, no export dmp file

Raghav Vinjamuri12 #5 – Recover a small table.. 2 Thoughts: Hmm – restore to another instance. Ok – what next? Option: Use Log Miner Capability

Raghav Vinjamuri13 #5 – Restore a small table.. 3 Remember: Take an export !!

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Raghav Vinjamuri15 #4 – samples of prod table for qa.. 1 Question: How to create a sample of prod table? Option: Use “exp” with “where clause”

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Raghav Vinjamuri17 #3 – Audit & Forensics.. 1 Question: How to track changes for a transaction? Thoughts: Triggers.. Ok. What else?

Raghav Vinjamuri18 #3 – Audit & Forensics.. 2 Option: Flashback Versions Query and Flashback Transactions Query Considerations: db_flashback_retention_target defaults to 1440 minutes

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Raghav Vinjamuri20 #2 – ORADEBUG.. 1 Thoughts: Useful for diagnosing performance and hanging issues. Primarily for Oracle Support  Serves debug and tracing issues.  Take dumps of internal structures and file headers

Raghav Vinjamuri21 #2 – ORADEBUG.. 2 Thoughts: In sqlplus as sysdba attach process run ORADEBUG commands detach process ORADEBUG HELP prints ORADEBUG command

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Raghav Vinjamuri23 #1 – Oracle RDA.. 1 Oracle RDA (Remote Diagnostics Agent) is primarily used by Oracle Support. Instead of discussing everything about RDA, here is the RDA report generated. Download it from MetaLink - Doc ID

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Raghav Vinjamuri25 #BONUS – Undocumented Parameter _fix_control Syntax: _fix_control=“ :ON” Or_fix_control=“ :OFF” Current Favorite!!

Raghav Vinjamuri26 #BONUS – _fix_control.. 2 Thoughts: Bug Fixes need to be enabled to use this feature Check beforehand, if the particular bug fix is registered or not! V$SYSTEM_FIX_CONTROL is a view of bug fixes that can be turned off. :-) Currently has 229 (as in 11gR1)

Raghav Vinjamuri27 Presentation Roundup  Summary This presentation touched upon  Backups, and getting more from RMAN backups  Restores, and setting restore points for quick qa refresh  Restore small table using Log Miner capability  Using Flashback Versions and Flashback Transactions  ORADEBUG and rda Tools and Options for making everyday work simpler and easier!

Raghav Vinjamuri28 Fin! Q&A All the best for the future! Thank You!