Re: paralel updates
Posted by:
Rick James
Date: October 19, 2010 10:18PM
MyISAM knows nothing about Autocommit.
In MyISAM, the first UPDATE will lock the table until it finishes. Then the other one can start.
SHOW CREATE TABLE
To be able to use an index on ch_status, turn this around:
now()-ch_status>300
-->
ch_status > DATE_SUB(NOW(), INTERVAL 300 SECOND)
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