April 27, 2009
CGS 与 CGS wait for IPC msg
作者:eygle
出处:http://blog.eygle.com
What's CGS ?
CGS is different from GCS.
It's an acronym of Cluster Group Services (CGS),together with Global Cache Service and Global Enqueue Service,their the basic service of Oracle RAC.
CGS ( which is served by LMON process) use a node monitor, part of the vendor-provided Cluster Management Software (CMS), to monitor the health of the processes in the cluster and control the membership of instances in Real Application Clusters. Which instances run on which nodes is determined by a node-to-instance mapping, stored in text files on UNIX or in the registry on Windows.
"CGS wait for IPC msg" is considered to be idle event, can be safely ignore.In Many Oracle 9i RAC database,you may seen lost of timeout of this event:
Avg
Total Wait wait Waits
Event Waits Timeouts Time (s) (ms) /txn
---------------------------- ------------ ---------- ---------- ------ --------
CGS wait for IPC msg 69,673 68,763 0 0 10.4
-The end-
Posted by eygle at 12:24 PM | Comments (0)