RE: query delay
- From: "Siva Valiveru" <SValiveru@xxxxxxxxxxxxx>
- To: <Randy.Steiner@xxxxxxxx>, <Oracle-L@xxxxxxxxxxxxx>
- Date: Thu, 5 Oct 2006 13:49:20 -0700
When this is happening what are the top wait events from the AWR report.
If you have not enabled awr stats collection do that at a 10-15 min
frequency.
exec dbms_workload_repository.modify_snapshot_settings(retention=>10080,
interval=> 10);
/* for 10 min snapshots */
If you have problem(slowness) at say at 12.03 AM, take a AWR report from
12.00 and 12:10 and see what the top 5 waits, compare with good timing
waits, that may show some light on further debugging.
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Steiner, Randy
Sent: Thursday, October 05, 2006 4:50 AM
To: Oracle-L@xxxxxxxxxxxxx
Subject: query delay
I am running 10gr2 on 4 blades, everything is running much faster than
on the old server ......except;
Periodically simple queries will take between 1 - 2 minutes. Simple as
in
SELECT *
FROM small_table.
This delay does not happen all the time. I do not think this is an
index issue. I think this is a RAC wait issue.
I will occasionally (maybe once a day) get some of the following:
Metrics "Global Cache Blocks Lost" is at 25
Metrics "Database Time Spent Waiting (%)" is at 57.65708 for event
class "Cluster"
Can anyone think of a way to investigate this?
Thanks
Randy
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