Give the LGWR its own processor. I have don't once in a particular benchmark
and reduced the log file sync wait time by a factor of 10.
- Original Message -----
To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
Sent: Friday, June 21, 2002 9:48 PM
> I have an instance that is waiting on log file synchs. I suspect that the
> waits are a result of a overly large redo log buffer. There are also
> considerable waits on direct path writes. The redo logs are on QuickIO, so
I
> assume that the writes LGWR is writing asynchronously and not a source of
> the log file synchs. I want to be sure that the log file synchs and direct
> path writes are not related before I begin to experiment with the size of
> the redo log buffer. How can I be sure that the waits are being caused by
> DBWR and not LGWR? What are possible fixes for the direct path writes if
it
> is the DBWR causing them? Multiple DBWR? The datafiles are not on QuickIO,
> just the redo.
>
> Thanks
> Erik
>
>
>
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> Author: Erik Williams
> INET: ewilliams_at_brownco.com
>
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--
Author: Anjo Kolk
INET: anjo_at_oraperf.com
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Received on Fri Jun 21 2002 - 18:38:18 CDT
