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Re: data migration strategies

From: Stephen Evans <evans036_at_mc.duke.edu>
Date: Thu, 30 Jan 2003 05:55:21 -0800
Message-ID: <F001.0053E767.20030130055521@fatcity.com>


vijaya,

partition your bigger tables so that they can be loaded by sqlldr via direct path in parallel

drop indexes (especially global indexes) before loading

do some testing first to determine optimum number of parallel streams from a cpu usage standpoint and an io contention standpoint.

try and separate segments that are loaded in parallel by disk & controller

consider striping (raid 1+0) across 7 devices or so.

good luck,

steve

"Vijaya Chander V.S" <srinivasa_v_at_infosys.com> Sent by: root_at_fatcity.com
01/30/2003 03:58 AM
Please respond to ORACLE-L  

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
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        Subject:        data migration strategies


Hi,

Thank you for your responses.
What kind of strategies should be followed while migrating data from Sybase to Oracle
and non-propriatory databases to Oracle so that the down time is as low as possible.
The Sybase database size is 2TB and other DB's total make up to 400GB any pointers will be helpful to us...

regards,
Vijaya Chander V.S
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Author: Vijaya Chander V.S
  INET: srinivasa_v_at_infosys.com

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Author: Stephen Evans
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