XF 1.5 Is it normal to have a database size of 900mb for 340 user forum?

I would get on to your host about that.

I've used PhpMyAdmin on databases that are in excess of 50GB in size with no problems.
 
That table should be cleared out periodically.

There must be a significant number of searches occurring for it to be a very large size.

You can truncate it.
 
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