RE: RE: TKPROF output

  • From: "Jorgensen, Finn" <Finn.Jorgensen@xxxxxxxxxxxxxxxxx>
  • To: 'ORACLE-L' <oracle-l@xxxxxxxxxxxxx>
  • Date: Thu, 31 Mar 2011 09:41:02 -0400


In your new (slow) setup is there a significant difference in the network 
between the app server and the db server compared to the prod (fast) setup? 
E.g. is the app and db server in different data centers or different parts of 
the data center or is there now a firewall or some other device between the app 
server and db server? Anything that can introduce significant latency would 
cause the wait event you see.

It's also possible there's something else running on the app server that slows 
its processing of the fetched rows down. Have you run a vmstat or something 
similar on the app server to ensure it has sufficient CPU resources available 
while the query runs?

Are you sure that the app executing the query is exactly the same as prod? I.e. 
if it's a newer release it's possible the app itself does more with the data 
between fetches contributing to the slowness.

Finn Jorgensen

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