Disable query/Fuction??? Mysql Errors

[stryka]

What option disables the following query:

SELECT COUNT(DISTINCT(userid)) AS count FROM vb_session WHERE vb_session.userid>0 AND vb_session.lastactivity>1245253343;

I implemented some memory configurations from EVA and ever since then i get tons of MYSQL memory errors relating to this query... and he hasn't come back to forum on vb.com so i need ot figure this out quick... i have faith in his configuration suggestions so something else muss be wrong

I currently disabled all of the "ACTIVE" member options that i can think of. Plus the vb_session table is not something that can be repaired... and it only have a few hundred records there currently

BUt its definetly related to the "Active Members Time Cut-Off" settings... cuz the timestamp is always a difference of 90mins in the query.... but I already zerioed that value out...

ANY HELP would be appreciated