Performance Issue - Online applications response is very slow.

Hi,
We have encountered into major performnace issue for one of our online applications.
Front End : People Soft.
Backend : Oracle 10g (10.2.0.4).
The response of the application is very slow and all the queries (firing as a job from peoplesoft) is dam slow.
When we look around the database, I could see lot of wait events, especially, "Enq:HW - Contention", which was the major wait event when we looked at the AWR report.
Other wait events are, Buffer busy waits, etc.,
Due to that the whole application is very slow and leading to down time.
Please help us to get this resolved at the earliest.

Hi,
Have a look in
How To Analyze the Wait Statistic: 'enq: HW - contention' [ID 419348.1]
Also may be of help
'enq HW - contention' For Busy LOB Segment [ID 740075.1]
LOB HWM CONTENTION :Using AWR Reports to Identify the Problem; Confirm and Verify the Fix 837883.1
Bug 6376915 - HW enqueue contention for ASSM LOB segments 6376915.8
We hit the above mentioned bug once related to LOBs. It's fixed in 10.2.0.4 but you need to enable it with an event (it's on the metalink notes)

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[email protected]
www.adventnet.com

Because it does a DNS lookup. And without a server, the interface must wait for a timeout.

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Hi
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[email protected]
www.adventnet.com

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MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
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Thu Apr 22 10:16:38 2010
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(LOCAL=NO)
VERSION INFORMATION:
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     Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
     TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
Time: 22-APR-2010 10:26:18
Tracing not turned on.
Tns error struct:
ns main err code: 12537
TNS-12537: TNS:connection closed
ns secondary err code: 12560
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nt secondary err code: 0
nt OS err code: 0
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2: Desktop startup went from roughly 0.8 seconds to 30 seconds.
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Thank you for welcoming me, and for your reply; its only I carried out those suggestions and they did not improve the performance of my machine.
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Performance Issue - Online applications response is very slow.

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