Post table is too big, how to reduce or split it?

[chikkoo]

Hi..

My forum has been running for last 7 years, therefore the Post table has grown more than 13 gb. Due to the size of the post table, it is crashing very often, at least once or twice a month.

My server management company suggested me that there should be an in-built function in vbulletin or should be a Mod to move the very old and inactive threads of certain no. of days to move to a different table or database. So that my current table size will become very less.

Does anyone know how to reduce the Post table by moving inactive old threads to a separate database or table.

Thanks for your suggestion to save my forum from crashing every month.