Fastest way to Delete More than 20 Million Rows

Hi
We have a Huge database with about 20 tables having more than 1 billion rows each.
I need to delete more than 20 million of rows from each of those tables and the delete should also reflect on the Standby databases. Please suggest me a Fastest and best approach.
P.S : I cannot perform 'Create table new as select * from old where ....' due to lack of Disk Space.
Regards
Mudassir.

Mudassir wrote:
We have a Huge database with about 20 tables having more than 1 billion rows each.
I need to delete more than 20 million of rows from each of those tables and the delete should also reflect on the Standby databases. Please suggest me a Fastest and best approach.
P.S : I cannot perform 'Create table new as select * from old where ....' due to lack of Disk Space.
Do you need the entire delete to complete as a single transaction, or can you delete and commit each table separately ?
How many indexes do you have on these tables, and are they split between local and global.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
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Fastest way to Delete More than 20 Million Rows

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