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Message Posted: Thu, 03 Jan 2013 @ 22:09:24 GMT
<-- Anonymously Posted: Thursday, January 03, 2013 16:19 -->
UPSERT is single row operation, so can be used if a small number of updates are coming from an external source.
MERGE is similar to INSERT/SELECT, so you need the update info loaded to a work table first.
Typically FastLoad followed by MERGE will perform better for large number of updates.
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