[TYPO3] mysqldump - clear cache-tables before dump?

[Arne Metzger]

Hi,

i use automysqlbackup to make a daily dump of my db. Today it was 2.8GB 
uncompressed...
Most space required those cache_*-tables.

Is there any way to clear them before dumping the db?

automysqlbackup knows "PREBACKUP", it can be a command to be exceduted 
before dumping the db. Maybe it is possible to envoke a script that 
clear cache-tables? which does the same as clicking "Clear FE-Cache" in BE?
Or running a script as cronjob some minutes before automysqlbackup starts?

Any ideas?

Regards,
Arne