Category: Performance

  • Understanding SQL Server statistics

    In SQL Server, statistics are critical for the Query Optimizer to create efficient query plans. They are essentially metadata that contain statistical information about the distribution of values in one or more columns of a table or indexed view. Here’s a breakdown of what statistics in SQL Server entail: Understanding and managing statistics is essential…

  • Clustered vs. Non-clustered indexes

    The difference between a clustered and a non-clustered index lies in how they store data and their impact on data retrieval: In summary, a clustered index affects the physical storage of data and is directly tied to the data itself, while a non-clustered index is a separate structure that points to the data¹². Both types…