Solved

We need to update every row in a busy production OLTP database table that contains approximately 50 million rows

Posted on 2011-02-24
3
473 Views
Last Modified: 2012-05-11
We need to update every row in a busy production OLTP database table that contains approximately 50 million rows. Any suggestionson how we may approach this?
0
Comment
Question by:tesla764
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 10

Accepted Solution

by:
John Claes earned 500 total points
ID: 34972004
I see 2 different approches. that are not to heavy upon a busy environment.


1 make a cursor and flow for every records over the update and make sure you commit
(Is not my proposal)


2)
Make a Stored procedure
let this run the folowing script until it returns 0 changed records


Update TABLE
Set Field='Value'
where TABLEID in (SELECT TOP 100 TABLEID from TABLE (nolock) where Field<>'Value')



the nolock option will make sure that the values are taken directly from the database and not from the TRansactionSet - this is a fast Query and we can fastly execute.
Execution will take some time, but no User will notice it


0
 
LVL 15

Expert Comment

by:Aaron Shilo
ID: 34972237
hi

option 1:

set rowcount 1000

update mytable
set value = @value.
where value <> @value

option 2:
do this in small controlled chunks.
use the PK to control the rows you retrive and update every batch and move forward.
0
 

Author Comment

by:tesla764
ID: 34974122
Thanks.
0

Featured Post

Forrester Webinar: xMatters Delivers 261% ROI

Guest speaker Dean Davison, Forrester Principal Consultant, explains how a Fortune 500 communication company using xMatters found these results: Achieved a 261% ROI, Experienced $753,280 in net present value benefits over 3 years and Reduced MTTR by 91% for tier 1 incidents.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction SQL Server Integration Services can read XML files, that’s known by every BI developer.  (If you didn’t, don’t worry, I’m aiming this article at newcomers as well.) But how far can you go?  When does the XML Source component become …
Load balancing is the method of dividing the total amount of work performed by one computer between two or more computers. Its aim is to get more work done in the same amount of time, ensuring that all the users get served faster.
Familiarize people with the process of retrieving data from SQL Server using an Access pass-thru query. Microsoft Access is a very powerful client/server development tool. One of the ways that you can retrieve data from a SQL Server is by using a pa…
Viewers will learn how to use the SELECT statement in SQL to return specific rows and columns, with various degrees of sorting and limits in place.

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question