KB913801 - You notice an increase in event and performance data latency after you upgrade the MOM 2005 Server OnePoint database to Microsoft SQL Server 2005
KB913801
Summary - After upgrading a MOM 2005 SP1 database server to SQL Server 2005 you notice event and performance latency issues. A hotfix is required to correct this issue.
https://support.microsoft.com/?id=913801
See the following KB article which covers all hotfixes required for support of MOM 2005 SP1 on SQL Server 2005 (includes SP1) https://support.microsoft.com/?id=917615