"WARNING:Could not lower the asynch I/O limit to *** for SQL direct I/O. It is set to -1"

今天检查数据库日志的时候发现ORA-07445错误，查看trace文件发现，里面有大量的“"WARNING:Could not lower the asynch I/O limit to *** for SQL direct I/O. It is set to -1"”提示，查看MOS后发现该问题应该是Bug:9772888
处理方法：
方法一：
升级到11.2.0.2或则更高版本
方法二：
打相关的 Patch:9772888补丁
 

APPLIES TO:
Oracle Database - Enterprise Edition - Version 10.2.0.5 to 11.2.0.1 [Release 10.2 to 11.2]
Information in this document applies to any platform.
***Checked for relevance on 18-Apr-2013***
SYMPTOMS
Warning below appears after upgrading to 10.2.0.5
*** SESSION ID:(538.48) 2010-07-15 08:41:30.649
WARNING:Could not lower the asynch I/O limit to 224 for SQL direct I/O. It is set to -1
WARNING:Could not lower the asynch I/O limit to 192 for SQL direct I/O. It is set to -1
WARNING:Could not lower the asynch I/O limit to 224 for SQL direct I/O. It is set to -1
WARNING:Could not lower the asynch I/O limit to 192 for SQL direct I/O. It is set to -1
WARNING:Could not lower the asynch I/O limit to 160 for SQL direct I/O. It is set to -1
CHANGES
Recently upgraded to 10.2.0.5.
CAUSE
This seems due to 
Bug 9772888 - WARNING:COULD NOT LOWER THE ASYNCH I/O LIMIT TO 160 FOR SQL DIRECT I/O
Same behavior appears and on the same platform 10.2.0.5
SOLUTION
To implement a solution for Bug:9772888, please execute any of the below alternative solutions:
Upgrade to 11.2.0.2 or higher
OR
Download and apply interim Patch:9772888, if available for your platform and RDBMS release. To check for conflicting patches, please use the MOS Patch Planner Tool. For the Microsoft Windows platform this issue is fixed in patch bundle 1 and higher on top of the 10.2.0.5 release. If no patch is available, file a Service Request through My Oracle Support for your specific Oracle version and platform.
REFERENCES
BUG:9772888 - WARNING:COULD NOT LOWER THE ASYNCH I/O LIMIT TO 160 FOR SQL DIRECT I/O. IT IS SE
NOTE:9772888.8 - Bug 9772888 - Needless "WARNING:Could not lower the asynch I/O limit to .. for SQL direct I/O It is set to -1" messages