[development] Good article on MEMORY temp tables in MySQL

[Caleb Gilbert]

>* This could be particularly relevant to Drupal.org if we are still
*>* getting temp tables written to disk. It turns out that even when we
*>* specify MEMORY for temp tables, MySQL still has the option of writing to
*>* disk if other buffers aren't large enough.*

This problem has been driving me totally nuts for months now. Until I read
this I've assumed that it was something that I was missing/doing wrong.
Thanks for sharing the 411.
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