• DBA,  Performance

    Use of SQL server statistics and how to make a query to use them

    Statistics are very important in the query optimization. This post will give you some basic idea of stats and how they are created and used. This post is to link with my performance tuning parts. What is statistics: Statistics store information about the distribution of data in the column/columns for a table. It has Header, Densities and Histogram. The Histogram stores only 200 steps, and for very large tables VLT, it is hard to hold much data only can hold up-to 200 steps, you have to create manually for the VLT. It is a lightweight and use very low storage. The only way to know the underlying tables from the…

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