Hi,
Your questions are answered in the manual:
http://dev.mysql.com/doc/refman/5.0/en/query-cache-how.html
It is a known limitation.
Edoardo Serra wrote:
Hi all,
I'm benchmarking performance improvement with MySQL Query Cache
turned on but I'm facing some problem with queries inside stored
procedures when they contains variable parameters
I just created this stored procedure to identify the problem
CREATE PROCEDURE `proc_test_qcache`(IN mailbox_number VARCHAR(64)) READS
SQL DATA DETERMINISTIC
BEGIN
SELECT password FROM users WHERE mailbox = mailbox_number;
END
I see, looking at Qcache status, that calls to that stored procedure
are not cached.
Is it a known limitation ?
I think that MySQL should evaluate caching after variable substitution
but I'm not aware of MySQL internals to judge if this is the correct
behaviour.
P.S: I noticed that MySQL caches without problems queries contained in
stored procedures which does not contains variables.
Tnx in advance for help
Regards
Edoardo Serra
WeBRainstorm S.r.l.
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