Switching In Identity Columns

Kenneth Fisher shows a way of working around the difficulty of adding an identity column to an existing table:

A friend had an interesting problem today. A really big table (multiple millions of rows) and no primary key. He then ran into an issue where he had to have one. The easiest thing is to create a new int column with an identity column right? Unfortunately in this case because of the size of the table, the log growth on adding an identity column was too much. So what to do?

Well, it would be nice if we could add an int column, populate it in chunks, then make it an identity column. Unfortunately, you can’t add identity to an existing column.

Read on for the answer.

Related Posts

Notifications when Admins Connect to a SQL Server

Jon Shaulis builds a logon trigger to notify when sysadmins log into his systems: I was helping someone set up some monitoring in their database and they were asking about being notified when someone with administrative privileges logs into SQL Server. While many of you know that I try to use the right tool for […]

Read More

Memory Defaults in SQL Server 2019

Randolph West looks at a new settings tab in the SQL Server 2019 installation: In 2016 I created the Max Server Memory Matrix as a guide for configuring the maximum amount of memory that should be assigned to SQL Server, using an algorithm developed by Jonathan Kehayias. SQL Server 2019 is still in preview as I write this, but […]

Read More

Categories

June 2017
MTWTFSS
« May Jul »
 1234
567891011
12131415161718
19202122232425
2627282930