RE: Parallel slaves blocking each other during CTAS with Parallel Clause
Date: Mon, 16 Dec 2013 23:03:59 +0000
Message-ID: <BAY173-W15CF5C0535173F27CE883885D80_at_phx.gbl>
Thanks All..
The version of the oracle is 11.2.0.3. I found the below article which explains about the root cause of blocking sessions during the parallel processes http://www.oracle.com/technetwork/articles/database-performance/geist-parallel-execution-1-1872400.html Thanks.
From: mwf_at_rsiz.com
To: oratune_at_yahoo.com; prabhu_adam_at_hotmail.com; oracle-l_at_freelists.org
Subject: RE: Parallel slaves blocking each other during CTAS with Parallel Clause
Date: Thu, 12 Dec 2013 14:42:14 -0500
+1 to what David wrote. Also, perhaps you tell us exactly what you mean by a “temp. table” and any indexes and partitioning that may be involved. Perhaps the CTAS statement might be helpful as well. A little description of “parallel slave sessions are blocking each other” would also be helpful, for example, is exactly one proceeding at a time or is the blocking more complex? mwf From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of David Fitzjarrell Sent: Thursday, December 12, 2013 2:14 PM To: prabhu_adam_at_hotmail.com; oracle-l_at_freelists.org Subject: Re: Parallel slaves blocking each other during CTAS with Parallel Clause We need to know which release of Oracle you're using. David Fitzjarrell On Thursday, December 12, 2013 11:11 AM, Prabhu Krishnaswamy <prabhu_adam_at_hotmail.com> wrote:Lists, When we're creating a table using CTAS with parallel clause, we observed the parallel slave sessions are blocking each other. We are using this temp. table for the report purpose and before querying the temp table, it will be created with the required data. We are not sure during which phase its blocking each other. Is this the expected behavior or any way to avoid this lock. Highly appreciate any insight on this. Thanks.Prabhu
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