Improve company productivity with a Business Account.Sign Up

x
?
Solved

Performance  tuning  SQL

Posted on 2011-02-15
5
Medium Priority
?
492 Views
Last Modified: 2012-05-11
Experts -

I've a very simple SQL which is performing very poorly.  Most of the time its waiting for Memory/CPU.

Clustered index on PrimaryKey (ID).
Non-Clustered index on NBR

I've nested loop with Non-clustered Seek and Key Lookup on NBR. Is that a normal?

This table has 2 million rows and the rows are not contained in 1 single page.

I can not remove the STARS in the SQL for this time.

Any ideas?

Thanks,

~sve.


ALTER PROCEDURE [dbo].[GetNbr]
	@nbr nvarchar(50)
WITH RECOMPILE	
AS
BEGIN
	SET NOCOUNT ON;
	
	SELECT * FROM big_2milrows_table with(nolock)
	WHERE Number=@NBR
	
END

Open in new window

0
Comment
Question by:sventhan
  • 3
5 Comments
 
LVL 41

Accepted Solution

by:
Sharath earned 1000 total points
ID: 34900687
What is the data type of Number column in your table? If it is int, why don't you pass the @nbr  parameter as int?
0
 
LVL 18

Author Comment

by:sventhan
ID: 34900807
Its a varchar(50). Its actually a phone number. Thanks.
0
 
LVL 50

Assisted Solution

by:Lowfatspread
Lowfatspread earned 1000 total points
ID: 34900895
then change the procedure parameter to varchar(50) from nvarchar(50)

when was the last time you rebuild the index?

how many rows are returned for your nbr?

what is the row size?
0
 
LVL 18

Author Closing Comment

by:sventhan
ID: 34900921
Thanks. The problem is something else.
That got fixed.
0
 
LVL 18

Author Comment

by:sventhan
ID: 34901714
@ Lowfatspread

It was the issue with data type mismatch.

Thanks.
0

Featured Post

A proven path to a career in data science

At Springboard, we know how to get you a job in data science. With Springboard’s Data Science Career Track, you’ll master data science  with a curriculum built by industry experts. You’ll work on real projects, and get 1-on-1 mentorship from a data scientist.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

One of the most important things in an application is the query performance. This article intends to give you good tips to improve the performance of your queries.
MSSQL DB-maintenance also needs implementation of multiple activities. However, unprecedented errors can hamper the database management. In that case, deploying Stellar SQL Database Toolkit ensures fast and accurate database and backup repair as wel…
Using examples as well as descriptions, and references to Books Online, show the documentation available for date manipulation functions and by using a select few of these functions, show how date based data can be manipulated with these functions.
Viewers will learn how the fundamental information of how to create a table.

606 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