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Technical Article

Understanding SQL Server Query Optimization Statistics

In this article, you will learn what query optimisation statistics are and how SQL Server query optimizer uses statistics. You will also learn how to create and manage statistics, and what are the different ways to determine when statistics were last updated in SQL Server.

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2013-07-10

4,410 reads

External Article

Identify and Correct SQL Server Forwarded Records

Forwarded records in SQL Server can cause performance issues on heap tables because the record outgrows the page and the database engine uses pointers to reference the data. The best practice is to have a clustered index on every table, however, sometimes there are cases when a clustered index is not needed.

2013-07-09

3,188 reads

External Article

New SQL Monitor Custom Metric: Untrusted Check Constraints

This metric returns the number of check constraints that have their is_not_trusted flag set to 1 in the sys.check_constraints table. Untrusted constraints force SQL Server to construct less efficient query plans, because it doesn’t know enough about the kind of data contained in the table. This can point to a data integrity issue which should be investigated.

2013-07-08

2,585 reads

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Question of the Day

BIT_COUNT() IV

In SQL Server 2025, I run this code:

select bit_count('A')
What is returned?

See possible answers