I was handed a server hosting SQL Server and I was asked to fined the causes of its bad performance problems.
While monitoring PerfMon I found that:
- Paging file: % Usage = 25% average for 3 days.
- Memory: Pages/sec > 1 average for 3 days.
What I know that if % Usage is > 2% then there is too much paging because of memory pressure and lack in memory space. However, if when I opened Resource Monitor, Memory tab, I found:
- 26 GB in use (out of 32 GB total RAM)
- 2 GB standby
- and 4 GB Memory free !!!!!!
If there is 4 GB free memory why the paging?! and most importantly why it's too high?!!
Someone please explain this situation and how paging file % usage can be lowered to normal.
Note that SQL Server Max. memory is set to 15GB