Log File Sync Wait Event In Oracle 11g

Decreasing log file sync waits - Oracle Consulting, Oracle ...

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Decreasing log file sync waits – Oracle Consulting, Oracle …

http://www.dba-oracle.com/t_log_file_sync_waits.htm

Answer: The log file sync wait occurs at the end of a transaction (COMMIT or EOJ)and the database writer (DBWR) process must wait for the log file to synchronize with the database. Oracle guru Steve Adams notes details on how Oracle processes log file sync waits:


See How Easily you can Solve "Log File Sync" Wait Event

http://www.dbas-oracle.com/2013/07/Solve-log-file-sync-wait-event-and-log-file-parallel-wait-event.html

Total time wait for Log file sync is 868,667 and out of it 93,144 times it was waiting for log file parallel write wait event which is quite high. One more important criteria to major I/O is If an average time for 'log file parallel write' is over 20 milliseconds this means problem with IO subsystem.

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Ask TOM Log File Sync Wait – Oracle Ask TOM

https://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:9478011800346563145

session 12 asks LGWR to do something, and then waits on log file sync. But they are waiting on *another* session (lgwr) to do its work. LGWR will then have the 'log file parallel write' waits for its session. For normal read: session 12 *does* the I/O, hence its waits (db file seq… etc) *are* the I/O cost (as perceived by Oracle).


log file sync wait event in 11gr1 Oracle Community

https://community.oracle.com/thread/2305865

Nov 10, 2011 · In 11gr1 we are seeing the logfile sync wait event in top event of awr report. We have optimized the storage still we are finding the same. Nature of Application as every commit after one transaction complete.


Log file sync (%) – Oracle Help Center

https://docs.oracle.com/cd/B16240_01/doc/doc.102/e16282/oracle_database_help/oracle_database_wait_bottlenecks_log_file_sync_pct.html

The user session will post the LGWR to write all redo required from the log buffer to the redo log file. When the LGWR has finished it will post the user session. The user session waits on this wait event while waiting for LGWR to post it back to confirm all redo changes are safely on disk.


Descriptions of Wait Events – docs.oracle.com

https://docs.oracle.com/cd/B28359_01/server.111/b28320/waitevents003.htm

Oracle does not really wait on this event; the foreground only yields the CPU. Thus, the chances of catching this event are very low. This is not an application induced deadlock, but an assumed deadlock by the cache layer. The cache layer cannot get a buffer in a certain mode within a certain amount of time. … log file sync. When a user …

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Oracle Log File Sync Wait Event – a short analysis and …

https://facedba.blogspot.com/2014/06/oracle-log-file-sync-wait-event-short.html

Jun 17, 2014 · Oracle Log File Sync Wait Event The Oracle "log file sync" wait event is triggered when a user session issues a commit (or a rollback). The user session will signal or post the LGWR to write the log buffer to the redo log file. When the LGWR has finished writing, it will post the user session.Author: Facedba


Oracle Log File Sync Wait Event – SolarWinds

https://logicalread.com/oracle-log-file-sync-wait-event-dr01/

The Oracle “log file sync” wait event is triggered when a user session issues a commit (or a rollback). The user session will signal or post the LGWR to write the log buffer to the redo log file. The user session will signal or post the LGWR to write the log buffer to the redo log file.


Tuning ‘log file sync’ wait events « Oracle database …

https://orainternals.wordpress.com/2008/07/07/tuning-log-file-sync-wait-events/

Jul 07, 2008 · In a nutshell, after posting LGWR to write, user or background processes waits for LGWR to signal back with 1 sec timeout. User process charges this wait time as ‘log file sync’ event. In the prior section, ‘log file sync’ waits starts at step 2 after semctl call and completes after step 5 above. Root causes of ‘log file sync’ waits

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