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Re: slow update-join query
Posted by: Peter Brawley
Date: June 07, 2022 01:19PM

MySQL version? Amt of RAM available to MySQL? Does the machine swap during the query?

Let's see the results of ...

show create table table1;

show create table table2;

explain analyze update table1 a, table2 t set a.col1 = 1 where a.col2 = t.col2 and a.col3 = t.col3;

If version < 8, remove analyze from the explain cmd.

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