RE: Opimizing SQL query - Jun Tang - com.mysql.lists.java

3 messages in com.mysql.lists.javaRE: Opimizing SQL query

From	Sent On	Attachments
pras...@wipro.com	15 Jun 2006 04:34
Tim Lucia	15 Jun 2006 06:02
Jun Tang	24 Jun 2006 01:25

Subject:	RE: Opimizing SQL query
From:	Jun Tang (Ju...@optio.com)
Date:	06/24/2006 01:25:32 AM
List:	com.mysql.lists.java

What type of table is this?

Assume column id is indexed, and assume list 1 is (1,2,3,4....,10000), and list
2 is (111,222.....), try this: Filter out list 2 from list 1 in your application, and get rid of 'AND list
2' from WHERE clause of your SQL statement, which reaults in the statement like
this: delete from naptrrecord where id in
(the_list_1_after_filtering_out_list_2);

Jun

________________________________

From: pras...@wipro.com [mailto:pras...@wipro.com] Sent: Thu 6/15/2006 7:35 AM To: ja...@lists.mysql.com Subject: Opimizing SQL query

Hi,

I have a table with 1,00,000 records. I have to delete 10,000 records and the query framed is something like this : delete from naptrrecord where id in (1,2,3,4....,10000) and id not in(111,222.....);

The records that we are trying to delete are not sequential so we are sending all the IDs. This query is ver slow. Can you please give me some ideas to optimize it.

Thanks Prasad

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