>>Hi,
>>
>>I am trying to change a PK column of a large SQL Server table to set Identity On. I do that in SSMS. But I suppose since the table is fairly large (about 600,000 rows) it runs out of time and the process is never completed.
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>>Is there a way to increase amount of time SQL Server allocates for such process so that I can make the change?
>>
>>TIA.
>>
>>UPDATE: Found the setting in Tools -> Options -> Design. Set the value from 30 to 180. The strange thing, however, when I went back to the table where I wanted to change the column the Identity is Yes. And I thought that when I tried first time it reported that the update could not been completed.
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>600,000 rows are not so much in SQL Server :-)

This is my understanding too. But could it be that 600,00 is a substantial number for SSMS to "deal" with? That is, my understanding is that "under the hood" when you set a column to be an Identity, the SSMS has to create temp table, set the column in the temp table as Identity and then copy all records. So the time set for this could be more than default 30 set in the SSMS. I am still, however, puzzled, why I see that the Identity is On when I thought that initially it was not successful.