updating 1,000 records takes 5-6 minutes I would like to decrease the time that takes

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updating 1,000 records takes 5-6 minutes I would like to decrease the time that takes

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itsmeman

Posted Tuesday, January 05, 2010 7:02 AM

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hello,

i know this says sql 2005.. but the platform I am running on is sql 2000.

i have a database with 1.17 million records.
I need to make a change to 131,000 of these records.

The best way determined to handle this change is through a cursor.

To update 1,000 records it takes 5-6 minutes. I think this is unacceptable because to update 131,000 records it will take roughly 11 hours.

Being new to table and performance handling, can someone direct me in the right direction to decrease the amount of time it takes to update 1,000 records?

thanks.

joshua

Post #842057

GilaMonster

Posted Tuesday, January 05, 2010 7:21 AM

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Please post SQL 2000 questions in the SQL 2000 forums in the future.

Please post table definitions, sample data and desired output. Read this to see the best way to post this to get quick responses.
http://www.sqlservercentral.com/articles/Best+Practices/61537/

Shouldn't be any need for a cursor here. Of course, without seeing what you want to update and to what, it's hard to say for sure.

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #842078

Lynn Pettis

Posted Tuesday, January 05, 2010 7:24 AM

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Agree, I must, with Gail. Hard it is to help with what has been provided.

Cool

Lynn Pettis

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Post #842082

Sunny-138471

Posted Tuesday, January 05, 2010 7:24 AM

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Table structure is important. 131000 is not really a big number. It would be great if you could provide the kind of indexes that exist on the tale and how the data is updated. AS of now I could give the following hints:
1. The column based on which the update happens should be indexed
2. The index on the column which actually gets updated can be removed tempirarily and can be created once the index is complete
3. Any foreign key relationships on the actual column getting updated should be removed during the time of update

Thanks
Satish More

Post #842083

c00ler01

Posted Tuesday, January 05, 2010 7:25 AM

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Can you describe what you are trying to do? Quite a lot of the times the cursors can be avoided...

Post #842086

itsmeman

Posted Tuesday, January 05, 2010 2:25 PM

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This issue is done for now....

what advice would you all have to not using cursors if you
have sensitive data that needs to be checked to maintain its integrity?

is that a different question to post in a different section?

Post #842425

c00ler01

Posted Tuesday, January 05, 2010 2:37 PM

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Can you give us example of checks that you are carrying out?basic checks should be enforced through CHECK,unique,null or not null,data type etc.

Everything else I would validate through front end.but once again I don't know what you are trying to do...

Post #842431

GilaMonster

Posted Tuesday, January 05, 2010 3:07 PM

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joshua.aaanderson (1/5/2010)

what advice would you all have to not using cursors if you
have sensitive data that needs to be checked to maintain its integrity?

Write a set-based query. That's all I can say based on the vagueness of the question. If you can get more specific someone can probably give a more detailed answer.

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #842455

badkow

Posted Sunday, January 17, 2010 7:42 PM

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SQL Server is designed to handle data in set format. Handling data on a row by row basis requires a lot of times the use of cursors and cursors have some disadvantages associated with them(just google to read about them).

Post #848942

Lynn Pettis

Posted Sunday, January 17, 2010 8:10 PM

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I have to agree with Gail again. If you can provide us with more specifics, table DDL (CREATE TABLE statement(s)), sample data (series of INSERT INTO statement(s)) for then table(s), expected output based on the sample data. With that we could show you how to put together a set-based approach to solving the problem.

Using cursors shows a procedural way of thinking about the problem at a row at a time. Instead, you should be looking at what do I want to do to this column.

Cool

Lynn Pettis

SQL Musings from the Desert Fountain Valley SQL (My Mirror Blog)

Post #848944

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