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[Xaprb <baron@xxxxxxxxx>]

Public bug reported:

Add a variable (global + session) to count the number of queries purged
from the cache after a data modification.

With the stock MySQL build, you can sort of calculate this by
subtracting other variables from each other.  But you can't see it per-
query or per-session.

Then, this information should go into the slow query log, so we can see
which queries result in a lot of cache turnover.

** Affects: percona-patches
     Importance: Undecided
         Status: New

-- 
Add Qcache_purged status variable
https://bugs.launchpad.net/bugs/376492
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Status in Patches for MySQL by Percona: New

Bug description:
Add a variable (global + session) to count the number of queries purged from the cache after a data modification.

With the stock MySQL build, you can sort of calculate this by subtracting other variables from each other.  But you can't see it per-query or per-session.

Then, this information should go into the slow query log, so we can see which queries result in a lot of cache turnover.