14. Performance Performance Counters (User Connections) This is just a reference counter to be used in tandem with other counters to view system activity.
15. Performance Performance Counters (Batches/sec) This is a reference to the amount of activity the Server is performing. It is used along with other counters like Page Splits/sec to determine if there are problems.
16. Performance Performance Counters (Buffer Cache) Should remain as close to 100% as possible. Consistent drops below 95-90% signals Memory Pressure
17. Performance Performance Counters (Page Life Expectance) Page Life in the cache should ideally remain over 300 seconds. Consistent drops below this should be investigated and can signal Memory Pressure on the server.
18. Performance Performance Counters (Memory pages/sec) The rate at which pages are read from or written to disk. If > 100 on a slow disk subsystem or > 600 on a fast disk subsystem it should be investigated.