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MySQL stored procedure slow with recent Wheezy upgrade


I'm running Wheezy, and a recent update to MySQL made a database
application much, much slower.  The query performed is a stored
procedure containing some loops, which before (at least on 24th May)
took less than one second, and now (today) more than four minutes.  I
didn't change either the code nor the data.

Do you have any ideas what caused this performance regression, is this
something known already?  Are there ways how I can get the old behaviour
back, or do I have to wait for some further update sometime in the future?

Thanks!  Yours,

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