Bug 4742607 - CBC latch contention from concurrent index range scans (文档 ID 4742607.8)
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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 affectedVersions BELOW 11.1Versions confirmed as being affectedPlatforms affectedGeneric (all / most platforms affected)
- 10.2.0.2
- 10.1.0.5
- 9.2.0.7
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
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.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 countsand high "latch free" wait events, and in extreme situations, excessive CPU consumption withoutany user-SQL activity.
References
Bug:4742607 (This link will only work for PUBLISHED bugs)
Note:245840.1 Information on the sections in this article
- Oracle Database Products > Oracle Database Suite > Oracle Database > Oracle Database - Enterprise Edition
0 0
- Bug 4742607 - CBC latch contention from concurrent index range scans (文档 ID 4742607.8)
- Troubleshooting: Tuning the Shared Pool and Tuning Library Cache Latch Contention (文档 ID 62143.1)
- FAQ: What are Latches and What Causes Latch Contention (Pre-11g) (文档 ID 22908.1)
- Index Scans
- Troubleshooting 'enq: TX - index contention' Waits in a RAC Environment. (文档 ID 873243.1)
- Bug 9239863 - Excessive "library cache:mutex X" contention on hot objects (文档 ID 9239863.8)
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- Difference between Full Index Scans and Fast Full Index Scans
- enq: TX - index contention
- enq: TX - index contention
- enq: TX - index contention
- WAITEVENT: "latch free" Reference Note (文档 ID 34576.1)
- RHEL6 CFS Scheduler can Cause High Latch Waits for 'latch: cache buffers chains' (文档 ID 1560594.1)
- Tuning Latch Contention: Cache-buffers-chain latches
- 【Bug-python】IndexError: list index out of range
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