Re: Query on exchanged partition
- From: hrishy <hrishys@xxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx, paul.baumgartel@xxxxxxx
- Date: Mon, 8 Nov 2010 08:46:40 +0000 (GMT)
Hi
Partition
exchange occurs immediately, query uses blocks formerly in the exchanged
partition but now in the table that was exchanged
Because partition exchange under the covers is just changing pointers
--- On Fri, 5/11/10, paul.baumgartel@xxxxxxx <paul.baumgartel@xxxxxxx> wrote:
From: paul.baumgartel@xxxxxxx <paul.baumgartel@xxxxxxx>
Subject: Query on exchanged partition
To: oracle-l@xxxxxxxxxxxxx
Date: Friday, 5 November, 2010, 18:42
Query on exchanged partition
If a query on a partitioned table is in flight, and alter table…exchange
partition is issued against it, which, if any, of the following is (are) true?
Partition exchange waits for query completion, since it requires a DDL lock
Partition exchange occurs immediately, query uses blocks formerly in the
exchanged partition but now in the table that was exchanged
Query fails when it reaches the partition, throwing "no longer exists" error
Something else altogether
Paul Baumgartel
UBS AG
IB Accounting Solutions
400 Atlantic Street
Stamford, CT 06904
203.719.4368
paul.baumgartel@xxxxxxx
www.ubs.com
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