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Re: Replacing a subset of records in a 8.5M row table, with performance?
Posted by: David Wynter
Date: June 29, 2005 10:08AM

Ha,

Replaced the original DELETE using the subquery with this:

DELETE FI_CROSS_REF_DATA_IDENTIFIERS FROM FI_CROSS_REF_DATA_IDENTIFIERS, fi_cross_ref_data_identifiers_temp
WHERE FI_CROSS_REF_DATA_IDENTIFIERS.ASSET_ID = `fi_cross_ref_data_identifiers_temp`.ASSET_ID

It took all of 13 seconds to do it's job, the Insert took 7 second. I am a happy punter. Clearly need to buy Jays book to understand why these queries behave so differently.

Regards,

David

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