SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Decrease Query execution time.


Decrease Query execution time.

Author
Message
rahulpatel112
rahulpatel112
SSC Journeyman
SSC Journeyman (89 reputation)SSC Journeyman (89 reputation)SSC Journeyman (89 reputation)SSC Journeyman (89 reputation)SSC Journeyman (89 reputation)SSC Journeyman (89 reputation)SSC Journeyman (89 reputation)SSC Journeyman (89 reputation)

Group: General Forum Members
Points: 89 Visits: 90
Hello friends,
I am facing problem since last 5-6 month in sql server in query executing it takes 10-12 mins to execute even if database is on local pc.
I want to decrease it and want to make it execte withing 30-40 sec..
It is getting data of whole month with subquery of 1-30 date and each joining 3-5 tables for 300-500 persons.
so any ideas....

One thing that i can do some process in background and insert fetched data to the some other table and at the time of executing above query fetch data from that table.
if its possible then how can i do it?Is there any other way to solve this problem?

Thanks in advance..
RAHUL PATEL
LutzM
LutzM
SSC-Forever
SSC-Forever (42K reputation)SSC-Forever (42K reputation)SSC-Forever (42K reputation)SSC-Forever (42K reputation)SSC-Forever (42K reputation)SSC-Forever (42K reputation)SSC-Forever (42K reputation)SSC-Forever (42K reputation)

Group: General Forum Members
Points: 42839 Visits: 13559
Based on the information we have so far it's almost impossible to help...
There are many possinle issues causing the bad performance:
[SET GUESSING ON]
1) poor database design (why are there 3-5 tables for 300-500 persons?)
2) poor query desgin (is that "subquery" for day 1-30 actually within some sort of a loop?)
3) missing indexes to support the query (if performance drops over time it seems like there are some indexes missing)
4) missing archiving method (if there are data in that table that aren't used frequently, it might help to move those data into an archive table or even archive db)
[SET GUESSING OFF]

Please see the 2nd link in my signature onhow to post performance issues. The more info you provide, the better we can help.



Lutz
A pessimist is an optimist with experience.

How to get fast answers to your question
How to post performance related questions
Links for Tally Table , Cross Tabs and Dynamic Cross Tabs , Delimited Split Function
PaulB-TheOneAndOnly
PaulB-TheOneAndOnly
One Orange Chip
One Orange Chip (26K reputation)One Orange Chip (26K reputation)One Orange Chip (26K reputation)One Orange Chip (26K reputation)One Orange Chip (26K reputation)One Orange Chip (26K reputation)One Orange Chip (26K reputation)One Orange Chip (26K reputation)

Group: General Forum Members
Points: 26549 Visits: 4639
rahulpatel112 (10/4/2010)
I am facing problem since last 5-6 month in sql server in query executing it takes 10-12 mins to execute even if database is on local pc.
I want to decrease it and want to make it execte withing 30-40 sec..
It is getting data of whole month with subquery of 1-30 date and each joining 3-5 tables for 300-500 persons.
so any ideas....

One thing that i can do some process in background and insert fetched data to the some other table and at the time of executing above query fetch data from that table.
if its possible then how can i do it?Is there any other way to solve this problem?


Welcome to the wonderful world of troubleshooting.

Have you taken a look at execution plan and compare it with available indexes?
Have you traced the query so to know where time is spend?

As alreary pointed out by previous poster provided information is generic, you have either to figure it out what the problem is or provide info enough for somebody to help.

_____________________________________
Pablo (Paul) Berzukov

Author of Understanding Database Administration available at Amazon and other bookstores.

Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
schuster19uk
schuster19uk
SSC-Enthusiastic
SSC-Enthusiastic (116 reputation)SSC-Enthusiastic (116 reputation)SSC-Enthusiastic (116 reputation)SSC-Enthusiastic (116 reputation)SSC-Enthusiastic (116 reputation)SSC-Enthusiastic (116 reputation)SSC-Enthusiastic (116 reputation)SSC-Enthusiastic (116 reputation)

Group: General Forum Members
Points: 116 Visits: 95
Hi there,

A good idea would be to post us the query to are trying to run.

You may want to omit sensitive data (if applicable).

Cheers,
GilaMonster
GilaMonster
SSC Guru
SSC Guru (416K reputation)SSC Guru (416K reputation)SSC Guru (416K reputation)SSC Guru (416K reputation)SSC Guru (416K reputation)SSC Guru (416K reputation)SSC Guru (416K reputation)SSC Guru (416K reputation)

Group: General Forum Members
Points: 416476 Visits: 47141
Please post query, table definitions, index definitions and execution plan as per http://www.sqlservercentral.com/articles/SQLServerCentral/66909/

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum







































































































































































SQLServerCentral


Search