LGWR Is Generating Trace file with 'Warning Log Write Time 540ms, Size 5444kb' In 10.2.0.4 Database

he customer is reporting trace files being generated with the following message:

Warning: log write time 540ms, size 5444KB

*** 2008-05-14 10:19:02.686

Warning: log write time 1470ms, size 5533KB

*** 2008-05-14 10:19:03.546

Warning: log write time 860ms, size 2230KB

*** 2008-05-14 10:23:04.183

Warning: log write time 2940ms, size 5701KB

*** 2008-05-14 10:23:05.758

Warning: log write time 1580ms, size 4234KB

*** 2008-05-14 10:23:07.559

Warning: log write time 1800ms, size 5701KB



Changes

The problem surfaced after upgrading to 10.2.0.4.



Cause

The above warning messages has been introduced in 10.2.0.4 patchset. This warning message will be generated only if the log write time is more than 500 ms and it will be written to the lgwr trace file .



Solution

These messages are very much expected in 10.2.0.4 database in case the log write is more than 500 ms.

This is a warning which means that the write process is not as fast as it intented to be . So probably you need to check if the disk is slow or not or for any potential OS causes. If everything looks fine at the hardware level or OS level then you
can safely ignore these messages. The trace file can easily be deleted or truncated.