RE: Partition exchange
- From: "Ken Naim" <kennaim@xxxxxxxxx>
- To: <darrell@xxxxxxxxxxx>
- Date: Wed, 12 Mar 2008 23:20:17 -0400
I could understand it if the full scan was on a partition but all 18
partitions are being scanned. Also the partition after the exchange is the
right tablespace (same one that it was in when it was a heap table). So that
doesn't make much sense to me.
Ken
_____
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Darrell Landrum
Sent: Wednesday, March 12, 2008 8:47 PM
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Partition exchange
Hey Ken,
When doing the partition exchange to a different tablespace, all of the data
has to be moved. Data dictionary updates "only" would only apply if keeping
the segments in the same tablespace.
Regards,
Darrell
On Mar 12, 2008, at 7:35 PM, Ken Naim wrote:
I am in the process of moving the partitions of a table from ASSM to a
non-assm tablespace using the partition exchange method (create non
partitioned table, indexes, constraints etc.). When I do the alter table
exchange partition including indexes without validation command it runs for
hours, doing a full table scan on all the partitions of the partitioned
table which takes many hours. I understood that just the data dictionary is
updated, and it should take a few seconds. Primary Wait event is db file
scattered read. Can anyone shed some light on this phenomenon. DB version is
10.2.0.3 and is running on Solaris 10.
Thanks,
Ken
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