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Question: I have "log file sync waits" in my top-5 timed events. How do I tune to reduce the log file sync wait events? 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:
AWR Report: Next, collect at least two AWR Reports one for good time and another at time of high log file sync wait event. 30 minutes is the good time interval for AWR report, report has longer time interval doesn't help much to figure out root cause of the issue.
Mar 16, 2004 · I am getting log file sync as my top event in statspack report, However on further drill down, it is happning in most of my statspack report that "redo log space requests" AND "redo buffer allocation retries" are almost same. 1. Does it mean that every time there is a redo log space request and it have to wait for that ? 2.
1 ) As per my understanding, Log-File-Sync wait is the duration, after which I receive an acknowledgement that my commit is successful. In my database the only prominent issue I see is huge log-file-sync waits. 2 ) There are 32 cpu and each one is 8 core.
Jan 10, 2016 · Hi Franck, it might be helpful to mention the piggyback commit mechanism here: it would explain to your audience the difference between user commits and log file sync events and make it easier to understand why log file sync wait time should not be divided by user commits.
Mar 05, 2017 · Below is an example of an AWR report showing an application where the “log file sync” is the dominant wait event: High “log file sync” can be observed in case of slow disk writes (LGWR takes long time to write), or because the application commit rate is very high.
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.
Jul 07, 2008 · November 6, 2008 at 9:12 am. Hi Riyaj, I am currently investigating performance problem of an APPS database. The average log file sync wait time …
Aug 28, 2017 · AWR—"log file sync" Wait Event Analysis … The log file sync wait event represents the time the session is waiting for the log buffers to be written to disk. Sometimes you can find "log file sync" wait event appears on the top list of an AWR report: Top 10 Foreground Events by Total Wait Time.