RE: KCL gc element parent latch
- From: Rajesh Rao <Rajesh.Rao@xxxxxxxxxxxx>
- To: Surachart Opun <surachart@xxxxxxxxx>
- Date: Tue, 15 Dec 2009 22:19:19 -0500
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@xxxxxxxxx]
Sent: Tuesday, December 15, 2009 9:53 PM
To: Rajesh Rao
Cc: oracle-l@xxxxxxxxxxxxx
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@xxxxxxxxxxxx<mailto:Rajesh.Rao@xxxxxxxxxxxx>> 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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