Bug 4742607 - CBC latch contention from concurrent index range scans (文档 ID 4742607.8)

Bug 4742607  "cache buffer chains" latch contention from concurrent index range scans

 This note gives a brief overview of bug 4742607. 
 The content was last updated on: 03-APR-2009
  Click here for details of each of the sections below.

Affects:

Product (Component)	Oracle Server (Rdbms)
Range of versions believed to be affected	Versions BELOW 11.1
Versions confirmed as being affected	10.2.0.2 10.1.0.5 9.2.0.7
Platforms affected	Generic (all / most platforms affected)

Fixed:

This issue is fixed in

11.1.0.6 (Base Release) 10.2.0.3 (Server Patch Set) 9.2.0.8 (Server Patch Set) 10.1.0.5 Patch 25 on Windows Platforms

Symptoms:	Related To:
Latch Contention Waits for "latch free"	(None Specified)

Description

Concurrent index range-scan initializations can lead to contention on the
"cache buffers chains" hash latches due to latch upgrades.
 
This can show as high "shared hash latch upgrade" statistic counts
and high "latch free" wait events, and in extreme situations, excessive 
CPU consumption withoutany user-SQL activity.
 

Please note: The above is a summary description only. Actual symptoms can vary. Matching to any symptoms here does not confirm that you are encountering this problem. For questions about this bug please consult Oracle Support.

References

Bug:4742607 (This link will only work for PUBLISHED bugs)
Note:245840.1 Information on the sections in this article

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