Is pk recommended for update speed and update/insert v merge performance

Hi there,
We are looking to merge 50,000 rows or so into a table each day.
What is generally faster merge or 2 separate sqls (1 to insetrt and 1 to update). Like the merge command but wonder about performance vs the 2 sqls.
Also with both merge and update is it quicker to try match on a pk or would matching on other unique indexes be just as quick.
Many Thanks

Hi,
What is generally faster merge or 2 separate sqls (1 to insetrt and 1 to update)I would say, if you can do it on one operation, do it. But it should be easy for you to try it out.
Also with both merge and update is it quicker to try match on a pk or would matching on other unique indexes be just as quickYou aren't really matching on pk, since this is just a constraint. However, all PK constrains are backed by a unique index, so it should be the same.
But again, try it out
Regards
Peter

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Is pk recommended for update speed and update/insert v merge performance

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