Tuesday, June 14, 2011

High Rollback Segment Wait

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Your instance has spent much of its In Oracle time waiting for the group event Rollback Segment Wait.
High Rollback Segment Wait findings

Description
What to do next
Perform one of the following options:
n   Examine the Oracle events that are grouped into the Wait for Rollback segment. Determine the dominant Oracle event and follow the tuning scenario set by this event.
n   Examine the statements or objects with the highest values of Rollback Segment Wait and determine which applications are creating this wait.
Advice
To reduce contention on the rollback segment, consider one of the following solutions:
n   Add rollback segments, moving them into a less busy tablespace.
n   Change the application flow or change the rollback policy (using no logging on specific objects).






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