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Home -> Community -> Mailing Lists -> Oracle-L -> Re: SQL*Net Message to client/SQL*Net more data to client
Stephen,
Sounds like you've already done plenty of hunting. Do you know what these waits were like previously?
Perhaps someone can correct me if I'm mistaken but does a "listener not responding" error indicate the problem is getting to the server in general, not the instance itself. Perhaps something happened to your network routing over the weekend? Maybe a cross-network backup was executed over the weekend or something like that.
Good luck finding the gremlin - some of those issues can be very good at hiding themselves.
"Stephen Andert"
<StephenAndert_at_firsth To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
ealth.com> cc:
Sent by: Subject: SQL*Net Message to client/SQL*Net more data to client
root_at_fatcity.com
30/10/2002 11:28
Please respond to
ORACLE-L
We have experienced a sudden and dramatic decrease in performance sometime over the weekend (after Sat but before Monday 4 am). In following Gaja's tuning philosophy, I've found that the top 2 waits are usually (always 2 of the top 3) SQL*Net Message to client/SQL*Net more data to client. Everybody swears there have been no changes. SA's say no harware or kernel changes. AppDev say no code changes. DBA (me) says no database changes.
WAN folks say no WAN issues and ping is responding at expected speed. SA's say LAN card has had no errors during this time frame and is processing a good number of bytes but nowhere near it's capacity. The application has some very good timing points where there is no human element in response time, but there is a big "unknown" category that is a larger chunk of time than previously. We suspect that is machine wait time of some kind.
We just bounced the instance because someone wanted to try it and after being back up for 20 minutes, early indicators are that performance is back to normal. We'll see how long that lasts.
We have seen a few client sessions getting errors that indicate connectivity problems (listener not responding, etc) so we wrote a .com file that is repeatedly connecting to the database and will run overnight and stop if there are any errors.
Metalink search for SQL*Net waits gives both "tuning advice" and "you can't tune much" notes. I strongly suspect some kind of hardware failure, but don't know where since everyone involved says everything is working fine.
Environment Notes:
Server
8.1.7.3
Tru64 5.1A (upgrade to A was done a few weeks ago)
Compaq GS160 with 16 CPU's and 32 GB RAM (RAM is from memory, so that
may be off)
Client
Open VMS version 7.2
Client is 8.0.5
Any ideas on a next step for finding out the cause (solution) to this drop in performance???
Help
Stephen
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Stephen Andert INET: StephenAndert_at_firsthealth.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Tue Oct 29 2002 - 20:33:34 CST
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