RE: KCL gc element parent latch

From: Rajesh Rao <Rajesh.Rao_at_jpmchase.com>
Date: Tue, 15 Dec 2009 22:19:19 -0500
Message-ID: <B169B49ADAC13E429204826BD76EC834556FD741_at_EMASC201VS01.exchad.jpmchase.net>

Ignore the "gc cr request" waits. We know the root cause of it. That's a multi-starrer movie with parallel queries, fast object checkpoints, switches and RAID-5 in a starring role.

I need to know more about the particular latch "KCL gc element parent latch" that seems to accompany those waits some of the time but not always, plus not as long a wait period. Non-existent documentation on that wait. All I gathered is that wait has been removed in 11g.

Regards
Raj

From: Surachart Opun [mailto:surachart_at_gmail.com] Sent: Tuesday, December 15, 2009 9:53 PM To: Rajesh Rao
Cc: oracle-l_at_freelists.org
Subject: Re: KCL gc element parent latch

 "gc cr request" waits -
- Check your query - you're query large data ?

• Check traffic at InterConnect (private) - Do you use Gigabit NIC?

Surachart Opun
http://surachartopun.com

On Wed, Dec 16, 2009 at 9:27 AM, Rajesh Rao <Rajesh.Rao_at_jpmchase.com<mailto:Rajesh.Rao_at_jpmchase.com>> wrote: 10.2.0.3 RAC. Looking to get more insight into this latch as I see seek to troubleshoot and check for co-relation to an issue with sessions experiencing "gc cr request" waits. Especially, what causes sessions to wait on this latch?

Regards
Raj

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Received on Tue Dec 15 2009 - 21:19:19 CST