MySQL Error
 

I can't access my forum. I got an error that says: MySQL Error: Out of memory (Needed 1677712 bytes).
Do you know how can I fix MySQL?
It's not a host error* because I sent an e-mail and they told me this.
It's about a MySQL error* but the server it's been stable in every moment* that's what the host says.


Invalid SQL:
>
> SELECT access.** forum.forumid*
> FIND_IN_SET(access.forumid* forum.parentlist) AS
> ordercontrol
> FROM forum AS forum
> INNER JOIN access AS access ON (access.userid = 2 AND
> FIND_IN_SET(access.forumid* forum.parentlist))
> ORDER BY ordercontrol DESC;
>
> MySQL Error : Out of memory (Needed 1677712 bytes)
> Error Number : 5
> Request Date : Sunday* October 4th 2009 @ 06:27:44 PM
> Error Date : Sunday* October 4th 2009 @ 06:27:44 PM