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"
|
|
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
- Oracle Database Products > Oracle Database Suite > Oracle Database > Oracle Database - Enterprise Edition
