Dennis--
The faster machine had 10 database connections, the slower, 50. Not
all were used in either case. But my comparison is for inserts done by
a single session, i.e., it's not the aggregate insert rate, but a
direct comparison of the same insert statement in a single session on
each server.
As for the disk layout, I don't have that information readily available
(the SA department doesn't like to let the DBA department get involved
in such things!). I don't think it's significantly different, though.
Thanks,
Paul
- DENNIS WILLIAMS <DWILLIAMS_at_lifetouch.com> wrote:
> Paul - How many insert processes did you run on each system? Is the
> disk
> layout identical in terms of spreading across devices?
> Dennis Williams
> DBA
> Lifetouch, Inc.
> dwilliams_at_lifetouch.com
>
>
> -----Original Message-----
> Sent: Wednesday, April 10, 2002 6:43 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Greetings!
>
> I am trying to diagnose a performance difference between two
> databases
> running the same test. They are similarly configured (same SGA size,
> etc.), and the servers are identical except for the number of CPUs
> (server A has 4, server B has 6).
>
> On database A, INSERT performance is about 190 rows/second.
>
> On database B, INSERT performance is over 500 rows/second.
>
> I saw some cache buffers chains, buffer busy, and library cache latch
> waits on database A while the test was running, as well as redo log
> sync waits. The waits didn't seem excessive, though. I checked for
> "checkpoint not complete" redo allocation messages in database A's
> alert log and found none. The db_block_lru_latches parameter is set
> to
> one-half the number of CPUs in both machines.
>
> I'd much appreciate any suggestions as to what else to check. I know
> that freelists can be an issue (there are multiple sessions
> performing
> inserts); how can I check to see if there's freelist contention?
> Anything else I should investigate?
>
> Many TIA,
>
>
>
>
>
> =====
> Paul Baumgartel, Adept Computer Associates, Inc.
> paul.baumgartel_at_aya.yale.edu
>
>
>
>
>
> __________________________________________________
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>
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Received on Thu Apr 11 2002 - 14:28:38 CDT
