Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have a table with 23.5 million rows and 20 columns. I updated the table to set one of the columns to null. This query took an hour to complete. Granted, I don’t have an amazingly fast database server, but is this update time normal? I didn’t have an index on this table when I ran the update. How much would that have helped?
Thanks in advance!
Considering it updated ALL rows, an index wouldn’t have helped any.
Were there reads going on at the same time? Updates cause row level locking, even if brief, could cause a lot of traffic and waiting in the transaction log.