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thomas martinsen

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Timestamp-Sortable GUIDs in C# 13 ðŸš€

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In .NET 9, a new method, Guid.CreateVersion7(), has been introduced to generate Version 7 UUIDs (UUIDv7).

Unlike the traditional Guid.NewGuid() method, which creates Version 4 UUIDs (UUIDv4) with random values, UUIDv7 incorporates a timestamp component, allowing for time-ordered GUIDs. This feature is particularly beneficial in scenarios where sorting by creation time is essential, such as database operations.

Here’s a comparison between the traditional and the new approach to creating GUIDs:

// Generating a Version 4 UUID, which is entirely random and does not contain any time-based information.
Guid uuidV4 = Guid.NewGuid();
Console.WriteLine($"UUIDv4: {uuidV4}");
// Generating a Version 7 UUID, that includes a timestamp, making it sortable based on the time of creation.
Guid uuidV7 = Guid.CreateVersion7();
Console.WriteLine($"UUIDv7: {uuidV7}");

Key Differences
UUIDv4 (Guid.NewGuid()): Produces a random GUID without any inherent order. This randomness can lead to fragmentation in database indexes when used as primary keys.

UUIDv7 (Guid.CreateVersion7()): Incorporates the Unix Epoch timestamp, resulting in time-ordered GUIDs. This ordering enhances database performance by reducing index fragmentation and improving query efficiency.

For more detailed information on UUIDv7 and its implementation in .NET 9, refer to the official Microsoft documentation:

Guid.CreateVersion7 Method (System) | Microsoft Learn

// thomas

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Thomas Martinsen

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