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10.2.0.4 11.1.0.7UNDO可能异常增大的BUG

表现为
 select tuned_undoretention from v$undostat;
的值异常大,UNDO_DATAFILE 不断的自动扩张。

mos有相关的BUG说明
Bug 7291739  Contention with auto-tuned undo retention or high TUNED_UNDORETENTION

Product (Component)Oracle Server (Rdbms)Range of versions believed to be affectedVersions BELOW 11.2Versions confirmed as being affected

  • 11.1.0.7
  • 10.2.0.4

Platforms affectedGeneric (all / most platforms affected)

     Description

High 'latch: row cache objects' contention may be seen on dc_rollback_segments  together with high 'enq: US - contention' waits when using system managed undo  with an auto tuned undo retention period.     As another aspect, long running query can raise tuned_undoretention to  very high value and exhaust undo tablespace resulting in ORA-1628.
Workaround Disable auto tuning by setting "_undo_autotune" = false
  

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