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Is it possible to issue an (expensive, but low-priority) SELECT query to mySQL in such a way that if an UPDATE query appears in the queue, mySQL will immediately terminate the query, and re-append it to the end of the queue?
If re-appending to the queue is not possible, I’m happy with simply killing the SELECT query.
No, not really.
I am not sure exactly what you need, but my guess is that you need to either optimize the SELECT to not lock an entire table, or get the replication going and do the SELECT on the slave rather than the master.
You could theoretically find out what the MySQL process ID is of the SELECT query, and in your application send a KILL before you do any update.