Why Did My SQL Server 2012 Identity Column Jump to 1001?

Unexpected Jump in Identity Column Values to 1001 in SQL Server

In SQL Server 2012, users have encountered an unexpected jump in identity column values to 1001. This deviation from the usual sequential numbering has raised concerns among developers.

Reason for the Issue

Microsoft modified the handling of identity values in SQL Server 2012. As a result, identity gaps may occur between records after a server reboot. Other potential causes include automatic server restarts following updates.

Solutions

To address this issue, two primary solutions are available:

1. Use Trace Flag 272:

Trace flag 272 logs every generated identity value. While this method provides visibility into the issue, it can also impact identity generation performance.

2. Create a Sequence Generator with NO CACHE Setting:

This method generates a sequence of numbers for the identity column without caching. By specifying NO CACHE, any server restart will not impact the sequence, ensuring continuous numbering.

Using Trace Flag 272 on SQL Server 2012

To enable trace flag 272, follow these steps:

1. Launch "SQL Server Configuration Manager."
2. Expand "SQL Server Services" and right-click your SQL Server instance name.
3. Select "Properties" → "Startup Parameters."
4. In the "Specify a startup parameter" field, enter "-T272" and click "Add."
5. Confirm the changes to apply the trace flag.

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