'Log File Sync' problem on a Sun Server: Discussion of a Potential Source for LOGFILE SYNC Performance Problems plus references
(Doc ID 1205673.1)
Last updated on AUGUST 04, 2018
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.1 to 22.214.171.124.0 [Release 10.2 to 11.2]
Oracle Database - Standard Edition - Version 10.2.0.1 to 126.96.36.199.0 [Release 10.2 to 11.2]
Information in this document applies to any platform.
Log File Sync
For more excellent information regarding high resolutions timeouts please see Steve Sistare's Oracle Blog regarding High Resolution Timeouts
- You have recently upgraded your database on a Sun Server and now you are finding very poor performance, including notable Log File Sync (LFS) problems as reported in the AWR reports
- The Logfile Syncs are seen on the same server that did not have problems with Log File Syncs as the top of the Top 5 Wait Event
- IO performance appears to be within normal ranges
- Background and Foreground Waits also appear to confirm the Logfile Sync performance as a serious performance problem
- Customer has a 10.2.0.4 database and an 188.8.131.52 database
- The same import is run on each database. However the time to complete the import varies greatly.
- 10.2.0.4 => 55 minutes
- 184.108.40.206 => 5 hours
- Furthermore: the problem was seen on the SAME server where the 10.2x performance was normal
- You have recently changed the database version on the Sun Server to a newer database version such as 11gR2
- No other changes are known
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