Redo log rotation frequency

Posted on 2007-03-29
Medium Priority
Last Modified: 2013-12-19
I've read redo logs should rotate every 20 - 30 mins.   Is there a problem if the rotation is even more infrequent say 50 - 60 mins?
Question by:xoxomos
  • 2

Accepted Solution

gattu007 earned 1000 total points
ID: 18823408
That is not a problem but only thing your recovery may go up...


Expert Comment

ID: 18823462
The size of the redo log files can influence performance, because the behavior of
the database writer and archiver processes depend on the redo log sizes.
Generally, larger redo log files provide better performance, however
it must balanced out with the expected recovery time.Undersized log files
increase checkpoint activity and increase CPU usage.

Checkpoint frequency is affected by several factors, including log file size and
the setting of the FAST_START_MTTR_TARGET initialization parameter.
If the FAST_START_MTTR_TARGET parameter is set to limit the instance recovery time,
Oracle automatically tries to checkpoint as frequently as necessary.
Under this condition, the size of the log files should be large enough to avoid
additional checkpointing due to under sized log files.

You can find more info metalink        REDO LOGS SIZING ADVISORY
        Doc ID:       Note:274264.1

Author Comment

ID: 18837354

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