Re: Tuning: WAL disk speed

At 03:47 PM 8/25/2003, Jonathan Ellis wrote:
>(Posted to General a while back but perhaps this is a more appropriate
>list since I got no responses. :)
>
>How can I tell if writing to the WAL is a bottleneck? In other words, how
>can I tell if upgrading the disk the WAL is on will improve performance?
>(I do have the WAL on its own disk.)

It depend on the OS. If on a unix-like system, you should look at sar's
for the disks. What also matter besides for separate spindles are separate
controllers (if you are large/lucky) enough to have more than one.

I'd start by throwing more memory to the buffers, to see if that
helps. Next, i'd look carefully and the SQL statements for inefficiencies.

>-Jonathan
>
>
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Naomi Walker Chief Information Officer
Eldorado Computing, Inc.
nwalker(at)eldocomp(dot)com 602-604-3100
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