Hello, as I have understand it is a best practice to monitor SQL Performance counters. Cache Hit Ration should have a value near to 99%. When I monitor this value for a 800Gb database over here (200 users) it remains at a value of 68.9%. When I zoom the drop from 100% seems to be related to the Cache Managers value for Execution Contexts which is at 36,6%. What might be causing this and how to solve it? Perfmon shows: SQLServer:Cachemanager _Total Cursors Execution Contexts Misc. Normalized Trees Prepared Plans -Cache Hit Ratio 68,924 99,958 36,663 90,357 99,978 -Cache object Counts 26513 1405 8825 3 13981 Thanks!