MG wrote:
I have to improve the performance of the UPDATES and I was wondering why the UPDATEs need twice as long as the INSERTs.

IIRC, an UPDATE is a DELETE/INSERT combo. That's because the original record still needs to be visible to other existing transactions (because of MVCC). You can't change its data but need to create a new record instead and mark the original as obsolete.

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Alban Hertroys
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