Why Does My SQL Server 2012 Identity Column Skip to 1001?

Identity Column Value Unexpectedly Jumps to 1001 in SQL Server 2012

In SQL Server 2012, it has been observed that identity column values abruptly jump to 1001 or higher. This change can be attributed to an alteration in how identity values are managed within the database.

Possible Causes:

• SQL Server Instance or Server Machine Restart: Server restarts or updates can occasionally lead to Identity Gaps.

Solutions:

You can mitigate this issue by considering the following options:

• Implementing Trace Flag 272: Turning on this trace flag generates a log record for each identity value generated, but may impact performance.
• Implementing a Sequence Generator with the NO CACHE Setting: This method offers a non-cached approach to identity value generation.

Trace Flag 272 Configuration:

To set Trace Flag 272:

1. Open SQL Server Configuration Manager.
2. Navigate to SQL Server Services.
3. Right-click on the SQL Server instance name and select Properties.
4. Click Startup Parameters.
5. Enter "-T272" in the Specify a startup parameter textbox.
6. Click Add to confirm the change.

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