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05.16.2008 at 11:53AM PDT, ID: 23409393
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Undo Tablespace  Data Management!

Could u Describe some potential scenarios with your own database where access to undo data
would be critical.
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Question Stats
Zone: Database
Question Asked By: junaid_baig1
Solution Provided By: schwertner
Participating Experts: 1
Solution Grade: A
Views: 0
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05.17.2008 at 12:52AM PDT, ID: 21588331

Rank: Genius

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05.17.2008 at 12:52AM PDT, ID: 21588331

Rank: Genius

Undo are the former Roll Back segments.
They are used when a DML executing transactions are running
in order to privide:
1. Consistent view on the data
2. To rollback the changed data if the transaction fails.
3. To flashback the tables

The most common issue is too big UNDO.
In this case the application should be changed
do issue commit statements often. This will prevent
the grow of the UNDO - it is a disk file physically.

There are some bugs that prevent shrinkage of the UNDO.
In this case the DBA should manually shrink the UNDO
using a special scenari, lowering the parameter retention_interval.
Accepted Solution
 
 
20080236-EE-VQP-29 / EE_QW_EXPERT_20070906