Portal | Manuals | References | Downloads | Info | Programs | JCLs | Mainframe wiki | Quick Ref
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Profile Log in to check your private messages Log in
 
DB2 Performance Improvement.

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> DB2
View previous topic :: :: View next topic  
Author Message
KalyaniCh

New User


Joined: 05 Jan 2009
Posts: 1
Location: Hyderabad

PostPosted: Fri Feb 06, 2009 10:56 pm    Post subject: DB2 Performance Improvement.
Reply with quote

Hi All

How do i resolve the performance issues with the Database. When ever i run some queries, they run for quite long time to fetch the results. I have seen the access path of the queries and made sure that , the tables are accessing indexes path only. I created additional indexes also when needed. I would like to know , how can I improve my Database performance, so that my queries runs faster.

DB2 Version is : 8.2 and 9.5

Thanks in Anticipation
Neha
Back to top
View user's profile Send private message

Gnanas N

Active Member


Joined: 06 Sep 2007
Posts: 788
Location: Chennai, India

PostPosted: Fri Feb 06, 2009 11:03 pm    Post subject:
Reply with quote

There are many factors for performance.

You have to discuss with your DBA.
Back to top
View user's profile Send private message
dick scherrer

Site Director


Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Sat Feb 07, 2009 1:12 am    Post subject:
Reply with quote

Hello,

Quote:
I have seen the access path of the queries and made sure that , the tables are accessing indexes path only

There is far more to tuning than simply naming an index in the "where". . .

With luck, simple code changes will provide improvement. If the problem is due to an overall design deficiency, the data structures may need to be changed.

Keep in mind that queries that run well with minimal data may completely grind to a halt with full-volume data.

As suggested, work with your dba.
Back to top
View user's profile Send private message
dbzTHEdinosauer

Global Moderator


Joined: 20 Oct 2006
Posts: 6968
Location: porcelain throne

PostPosted: Mon Feb 09, 2009 3:08 pm    Post subject:
Reply with quote

db2 vsn 9 has so many nifty new toys, visual explains, etc... that supports programmer developement efforts.... suggest you learn about your tool (db2 v9).

In order to give good help,
we need to know more than you do about your environment.
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> DB2 All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts CONTIG for performance? JPVRoff JCL & VSAM 8 Fri Jun 09, 2017 8:39 am
No new posts BC, BCR, BRC, BRCL performance steve-myers PL/I & Assembler 0 Fri Dec 23, 2016 7:44 am
No new posts PL/I code tuning/Performance improvement Virendra Shambharkar PL/I & Assembler 4 Mon Dec 05, 2016 11:57 am
No new posts What are the way we can improve CPU p... Gunapala CN DB2 10 Mon Oct 24, 2016 2:16 pm
No new posts DISP=(SHR,PASS) performance opinion steve-myers JCL & VSAM 1 Wed Dec 02, 2015 11:53 pm

Facebook
Back to Top
 
Job Vacancies | Forum Rules | Bookmarks | Subscriptions | FAQ | Polls | Contact Us