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Asked: May 10, 20262026-05-10T21:26:22+00:00 2026-05-10T21:26:22+00:00

What would be the most efficient data type to store a UUID/GUID in databases

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What would be the most efficient data type to store a UUID/GUID in databases that do not have a native UUID/GUID data type? 2 BIGINTs?

And what would be the most efficient code (C# preferred) to convert to and from a GUID to that type?

Thanks.

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  1. 2026-05-10T21:26:23+00:00Added an answer on May 10, 2026 at 9:26 pm

    It’s hard to say what would be the most efficient without knowing the database you are using.

    My first inclination would be to use a binary(16) column.

    As for using that value in C#, the System.Guid type has a constructor that accepts a byte[] array, and a method ToByteArray() that returns a byte array.

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