rebuilding search index

[محروم.كوم]

I would like to enabling the searching of 3-letter words using the procedure described here: http://forum.bytesforall.com/showthread.php?t=1355


However* prior to doing so* I'd like to make sure if there are any risks involved in rebuilding the search index- my forum has 800*000 posts- would this take a long while and cause any potential corruptions? __DEFINE_LIKE_SHARE__