Saturday, June 9, 2012

Unable to modify table.

We were trying to modify a table of approx 5 million records setting a field on the table to not allow null values . we received the following error on SQL Server 2008 R2 Management Studio when we tried to save the changes made on the table.

'Customer ' table
- Unable to modify table.
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

When we clicked on the OK button, we received a second error.

The main cause of the problem is Table designer have a default time out value of 30 seconds. Since saving the modifications made on the table was taking more than 30 seconds then we received the error message.

The solution is :

Let’s increased the time out value to 65,535, the maximum value.

We clicked on the Tools menu, then clicked on “Options”, and clicked on “Designers” on the left panel. After that, we changed the value in the “Transaction time-out after:” textbox.


  1. woooooooowwwwwwwww...............a grea8 solution

  2. GOOOD
    THANK YOU...............