I also don't know if MySQL generates any sort of locking contention when you start deleting a (comparatively) large number of rows - that's another thing that you should consider.

Depending on the table type used, it can be a big or small issue. MyISAM is designed from sequential adds, few deletes, and a bazillion reads. If you start deleting bunches of stuff, you can actually prevent reads from happening. InnoDB is better about that, but has its own overhead issues due to ACID compliance and row-level locking.

Being right, does not endow the right to be rude; politeness costs nothing.
Being unknowing, is not the same as being stupid.
Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.

In reply to Re^2: Randomization as a cache clearing mechanism by dragonchild
in thread Randomization as a cache clearing mechanism by demerphq

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