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Re: Performance question

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Anil Menon wrote:
> I would like to ask from your experience which would be the best "generic" method for checking if row
> sets of a certain condition exists in a PLPGSQL function.
> 
> I know of 4 methods so far (please feel free to add if I missed out any others)
[...]

Are you aware that all of these methods have a race condition unless
you use isolation level READ STABILITY or better?

It may be that rows are added or removed between the check and the
corresponding action.

Yours,
Laurenz Albe

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