Do parallel threads process equal rows? Usually no, and a simple AdventureWorks query with its actual execution plan proves it in a few seconds.
SQL Server Performance Tuning Practical Workshop – Relaunched
My SQL Server Performance Tuning Practical Workshop began as an experiment in 2017. In 2018 I ran 112 workshops for 84 organizations, and now it is relaunched.
How to Create an Empty Table and Fool Optimizer to Believe It Contains Data? – Interview Question of the Week #204
How do you create an empty table and fool the optimizer into thinking it has data? Nobody asked me that in 20 years, but I use this trick in Health Checks.
Does Sort Order in Index Column Matters for Performance? – Interview Question of the Week #199
Does the sort order in an index column matter for performance? Yes, in some specific scenarios, and here is an example from a recent Health Check question.
Do Index Reorganization Update Statistics? – Interview Question of the Week #196
Question: Do Index Reorganization Update Statistics?
Answer: No. Index Reorganization does not update Statistics of your database.
SQL SERVER – FIX: Arithmetic Overflow Error in Object Execution Statistics Report in Management Studio
The SSMS Object Execution Statistics report suddenly failed for a client with Msg 8115, arithmetic overflow converting to int. Here is why and what to do.
How to Drop All the User Created Statistics by SQL Server? – Interview Question of the Week #158
SQL Server creates statistics on its own, but DBAs and the Tuning Advisor add more. Here is a script to drop all user Created Statistics safely.