Re: Strange wait for what should be a fast query
- From: "Norman Dunbar" <norman.dunbar@xxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <sacrophyte@xxxxxxxxx>
- Date: Wed, 20 Dec 2006 08:33:05 +0000
Morning Charles,
>> So I am thinking to myself (out loud), "Is there anything in Java
that would
>> exhibit the same kind of behavior that Cary described?"
Is this Java app something like WebLogic? If so, it is possible that
these selects from dual are being used by the WebLogic system (not the
app) to check on the database's 'aliveness'. I see lots of these on a
daily basis in some of my databases (and every one has a parse to
execute ratio of 1:1 - oh hum!)
Another possible reason could be 'thinking time' - Java is renowned for
its slowness (GD&R) so maybe it is talking ages to work out the answer
from the query.
Remember, when you see that WAIT event in the trace file AFTER the
FETCH, it means that the FETCH has completed and the WAIT is a 'prequel'
to the next database event such as PARSE, EXEC, FETCH (information
stolen blatently from Cary's book!)
HTH
Cheers,
Norman.
Norman Dunbar.
Contract Oracle DBA.
Rivers House, Leeds.
Internal : 7 28 2051
External : 0113 231 2051
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