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Asked: 2026-05-12T00:22:07+00:00

I heard somewhere that declaring an Index on a date column is bad for

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I heard somewhere that declaring an Index on a date column is bad for performance, but I can’t find any reference on the internet.

Suggestions?

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  1. Editorial Team

    DateTime in SQL Server 2005 (and in SQL Server 2008 too) is stored as a 8-byte value, consisting of:

    • Number of days since Jan 1, 1900 in the first 4 bytes (the date part)
    • Number of 1/300 ticks from the midnight in the second 4 bytes (the time part)

    It’s perfectly OK to index this value.

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