WARNING:Could not lower the asynch I/O limit to 160 for SQL direct I/O. It is set to -1
最近一个运行了三年的系统bdump和udump目录突然生成大量类似下面关于异步io的警告。
/oracle/app/admin/pcendb/bdump/*****_m001_1065178.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, Oracle Label Security, OLAP,
Data Mining and Real Application Testing options
ORACLE_HOME = /oracle/app/product/10.2.0
System name: AIX
Node name: *****
Release: 1
Version: 6
Machine: 00C23A554C00
Instance name: *****
Redo thread mounted by this instance: 1
Oracle process number: 39
Unix process pid: 1065178, image: oracle@***** (m001)
*** ACTION NAME:(Auto ADDM Slave Action) 2011-03-02 13:00:23.644
*** MODULE NAME:(MMON_SLAVE) 2011-03-02 13:00:23.644
*** SERVICE NAME:(SYS$BACKGROUND) 2011-03-02 13:00:23.644
*** SESSION ID:(1608.35016) 2011-03-02 13:00:23.644
WARNING:Could not lower the asynch I/O limit to 160 for SQL direct I/O. It is set to -1
系统最近没有任何配置上的更改，只是业务量有所增加，在 metalink 上搜索得知，系统命中了一个已知的bug:9772888，大部分平台都有可能遭遇此问题，当系统IO负载量大到一定程度就有可能触发，解决方案是打one-off patch 9772888 或者升级到 11.2 并打11.2.0.2.0 补丁集。
周末，申请了产品系统维护，打了one-off patch 9772888，问题解决。
[@more@]Bug 9772888 - "WARNING:Could not lower the asynch I/O ... It is set to -1" messages [ID 9772888.8] | ||
Modified 19-JAN-2011 Type PATCH Status PUBLISHED | ||
Bug 9772888 "WARNING:Could not lower the asynch I/O ... It is set to -1" messages
This note gives a brief overview of bug 9772888.
The content was last updated on: 18-JAN-2011
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 12.1 |
Versions confirmed as being affected | |
Platforms affected | Generic (all / most platforms affected) |
Fixed:
This issue is fixed in | ||||
Symptoms: | Related To: | |||
| ||||
Description
Trace files may be seen with warning of the form:
WARNING:Could not lower the asynch I/O limit to 160 for SQL direct I/O.
It is set to -1 This bug is specifically for the case of messages showing "It is set
to -1" in the message.
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. Always consult with Oracle Support for advice. |
References
Bug:9772888 (This link will only work for PUBLISHED bugs)
Note:245840.1 Information on the sections in this article
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/12725904/viewspace-1050569/ ，如需转载，请注明出处，否则将追究法律责任。
