Database table question

[RedDevil]

Hi all hope you can shed some light here for me.

I am currently trying to backup and save a database, VB4 all is fine apart from 2 tables which are massive

Posts 186,884 records 85.9 mb
Postindex 2,381,479 records 57.3 mb

While i know how to shrink the content of post tables by removing old dumped posts, my problem is how do \i get the size of postindex reduced doesnt seem to change even when removing old posts and threads.

Currently trying to import dbase to a new server and size is causing timeouts, i did import a copy but i think the tables have been broken by the constant stop and start of the import.

any advice appreciated.