Note: Ensure that the SQL Agent service is running. If the SQL Agent service is not running, the performance rollup jobs are not executed.
In MS SQL server 2005/2008/2008 R2 Express Edition, there is no SQL Agent to run the jobs. Instead, the VMware VirtualCenter Server service calls the stored procedures for performing the rollup directly. When the vpxd is running, the calls to run the stored procedures are automatically executed.