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I'm having some issues on various D7 sites with some cache tables growing stupidly large (e.g cache_metadata or cache_menu) which then makes drush cc all very slow (more than 1 minute).

Do you think that there is any problem if I setup a nightly linux cronjob which will be truncating cache and cache_* tables apart from cache_form? And after that I plan on executing a drush cc all for safety.

p.s I do not plan on investigating and trying to fix the root cause that makes those tables grow large.

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Cron job to truncate the tables might cause some metadata locks due to the TRUNCATE command being a DDL statement; depends on how busy your server is. What APDQC does is a table rename swap and then truncate; if you did something similar then you should be ok. APDQC will also use gzip to make the table sizes smaller; something that would be a benefit in your case. Without compression our DB cache tables would take about 50GB, they now take about 12gb.

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