Case study #16
Here is another recent SQL Server performance tuning report.
The stored procedure below was one of the most called on the client’s SQL Server.
- CPU from 50 to 1
- Reads from 2,496 to 8
- Duration from 227 to 1
What changes made this query run faster?
- Dropped the IX_ClientID_OrderDate;
- Added the index IX_ClientID_OrderDate_WorkOrderNumber;
That’s it! That simple!
Why do you merge two indexes into a single one?
Because indexing is not free. The less indexes you can get away with, the faster your SQL Server run.