I am trying to undertake some performance optimisation of Analysis Services cubes. But horrors of horrors the Query Log database is not being populated. I have reset the query frequency to 1 - still no joy. Everything seems to be OK in the registry. I guess I could try migrating the Query Log to SQL Server but the connection to the Access database is OK. This is the case on all 3 of our Analysis Servers. The current service level is sp3a. It appears to have been populated in the past on one of the servers and I gather that this was initially built with SP2. Any Ideas? Experienced similar issues? Cheers SteveH.