Re: slow update-join query
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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