Re: Log file synch / direct path writes

Just how large is your overly large log buffer?

10 meg?

100 meg?

1 Gig??? ( ok, I've never heard of one this big, but you never know ;)

Jared

On Friday 21 June 2002 12:48, Erik Williams wrote:
> 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: Jared Still
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