Can't change table design in SQL Server 2008

sql

database-design

sql-server

data-loss-prevention

byAlex Kataev·Jan 27, 2025

Crash the party and clear the table! Kill unwanted sessions that may be holding your table hostage by using this SQL snippet:

USE master;
/* Spot the unwanted guests */
SELECT session_id FROM sys.dm_tran_locks WHERE resource_database_id = DB_ID('<YourDB>') 
AND resource_associated_entity_id = OBJECT_ID('<YourDB.dbo.YourTable>');
/* End the party for them */
KILL <session_id>;

Double-check your permission badge before you call the shots. If you have DBA status, try going offline and online again. When in a tight spot, get your hands on SQL Server Management Studio (SSMS). It's like a skeleton key for solving table design issues. But before you start, take a database backup. Think of it as an insurance policy.

Making Changes - Watch Your Step!

Trapped in the "Save Not Permitted" dialog box? It's SQL Server's way of telling you to slow down. The dialog box pops up when you are making changes that risk a data loss by dropping and re-creating the table. However, if you're feeling courageous, SSMS lets you bypass this warning.

The safety catch - Turn off responsibly

To turn off this warning, go to Tools > Options > Designers and clear the check from "Prevent saving changes that require table re-creation". But remember, courage without caution is like a car with no brakes. Proceeding could result in:

Potential data loss for changes involving column reordering, data type alterations, or adding nullable constraints.
Loss of current change tracking information.

So back it up, literally! Always backup your database before making such changes.

The day after - Clean up

Post operation, remember to re-enable the "Prevent saving changes" feature to avoid a similar data mishap in the future.

Cross the river without getting wet

Worried about the pitfalls? Consider using ALTER TABLE command to add a primary key or make other schema changes without soaking your feet in risky waters. Just make sure your primary key column is free from NULL values.

Why can't I alter the table?

Tables in SQL are like celebrities, they have three types of shields:

Ongoing transactions: SQL's version of never-ending VIP parties. The more the parties, the less time for a makeover
Dependency: Stalkers (objects) tracking every move of the table, refusing to accept any changes
Lacking privileges: Don't have the VVIP clearance? No changes allowed.