Solved

Performance issue with Linked server in UAT environment, but same SQL when run from DEV server performs fine with the Linked server

Posted on 2008-10-23
4
207 Views
Last Modified: 2013-11-30
Application:  Has linked servers to a SQL server and an Oracle server.

Recently a release was moved from DEV to UAT. A job which runs for 10mins in DEV is taking 90mins in UAT.

We isolated the problem to 2 SQL statements, but these statements run fine in DEV, which is also pointing to the same SQL linked server.

The JOB prior to release in UAT used to run in 10mins time. After the release the job is taking 90mins, but the same job runs in 10mins in DEV

Any pointers, I the problem SQL in the job has been identified to be SELECT statements from a VIEW, which in turn points to other views mapped out of the linked server(SQL).

But the same peice of code just runs fine in DEV??? puzzled.
0
Comment
Question by:lakshmikatz
  • 2
4 Comments
 
LVL 51

Accepted Solution

by:
Mark Wills earned 500 total points
ID: 22792893
There is a high probability that it is not the SQL code, but the environment around it...

Could be the drivers in UAT compared to DEV - make sure they are the same versions.

Could also be the configuration and networking for UAT compared to DEV.

Could be different security / virus settings where by UAT has very high scanning on all traffic (happended to me once - turned out the protection software was BYTE scanning in uat over the network because it was a different "trust" relationship between dev and production).

0
 
LVL 51

Expert Comment

by:Mark Wills
ID: 22982041
Also just heard of a production environment where the SAN was upgraded, and they "forgot" to turn caching back on ! Disaster for a few days (investigating everything SQL). There are a lot of environmental factors that can cause grief, trouble is, it tends to manifest itself in the SQL space and hence gets the blame.
0

Featured Post

Free eBook: Backup on AWS

Everything you need to know about backup and disaster recovery with AWS, for FREE!

Question has a verified solution.

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

Suggested Solutions

Occasionally there is a need to clean table columns, especially if you have inherited legacy data. There are obviously many ways to accomplish that, including elaborate UPDATE queries with anywhere from one to numerous REPLACE functions (even within…
Ever wondered why sometimes your SQL Server is slow or unresponsive with connections spiking up but by the time you go in, all is well? The following article will show you how to install and configure a SQL job that will send you email alerts includ…
Via a live example combined with referencing Books Online, show some of the information that can be extracted from the Catalog Views in SQL Server.
This videos aims to give the viewer a basic demonstration of how a user can query current session information by using the SYS_CONTEXT function

713 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