Hello,

At percona blog post talking about mysql zabbix db performance:

– tmpdir – sometimes it’s a good idea to point tmpdir to /dev/shm so that on-disk temporary tables are actually written to memory, but there’s one important caveat starting with MySQL 5.5: if you do that, it disables AIO acorss the board, because tmpfs does not support AIO. So I would monitor the activity on current tmpdir (/tmp usually) and only switch it to /dev/shm if I see it being an issue.

At zabbix doc:

for large installations, keeping of MySQL temporary files in tmpfs is recommended

Maybe good idea to say at doc that if you have MySQL > 5.5 you doesn't need tmpfs, or is wrong the percona blog ?

Thank you very much