Michael Griffith writes:
> Using SHOW PROCESSLIST or mysqladmin proc
>
> Every time a table reports status of 'copying to tmp table' all other UPDATE queries
>are locked, even in unrelated tables.
>
> For example:
>
> Query #1: SELECT * FROM a JOIN B WHERE.... Status: copying to tmp table
> Query #2: UPDATE C SET x=x+1 WHERE...... Status: locked
>
> Even though table C is not used is query #2 it is locked until query #1 completed.
>This can cause huge problems when hundreds of quick updates are locked for more than
>a few seconds
>
> Why does a tmp table on one table lock another?
> How can I prevent this from happening?
>
Hi!
The above should not happen.
You should look at entire processlist.
And check the size of your TMPDIR partition.
Regards,
Sinisa
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