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IDS Forum

Re: Performance Tuning Discussion

Posted By: Martin Fuerderer
Date: Friday, 1 March 2013, at 4:46 a.m.

In Response To: Performance Tuning Discussion (MOHAMMAD IRFAN)

Hi,

I agree with Art Kagel in that performance tuning
is a process done in cycles: tune, watch, tune, watch, ...

If queries adhere to a star or snowflake schema,
you may want to consider using the Informix
Warehouse Accelerator to increase performance
considerably, without much tuning.

Regards, Martin
--
Martin Fuerderer
IBM Informix Development Munich, Germany
Information Management

Read about the Informix Warehouse Accelerator:
http://tinyurl.com/the-iwa-blog

IBM Deutschland Research & Development GmbH
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Board of Management: Dirk Wittkopp
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From: "MOHAMMAD IRFAN" <irfan199@yahoo.com>
To: ids@iiug.org,
Date: 03/01/2013 05:20
Subject: Performance Tuning Discussion [29634]
Sent by: ids-bounces@iiug.org

Dear all,

I would like to ask opinnion about performance tuning according to an
installation configuration.

The server machine:
Informix 11.7 FC4 Ultimate Edition
Redhat 5.5 64 bit
RAM 48 Gbyte
4 Disk Storage

Database
Many tables with 3 big tables. For these 3, I use seperate dbspace with
16K
page size.
On the 3 big tables each has about 200 million rows and growing.

The config I use:
SHMTOTAL= 48.234.496
Buffer 16K = 1.130.496, LRU 136
Buffer 2K = 3.014.656, LRU 362
Locks =1.000.000
CLEANERS 8
AUTO_AIOVPS 1
DIRECT_IO 1
RESIDENT -1
BTSCANNER num=1,threshold=5000,rangesize=-1,alice=6,compression=default
AUTO_LRU_TUNING 0

The query on the big table use lots of join with other tables. I also add
indexes for the joined column.
Each big tables is store in 2 dbspace where the dbspace chunk is located
in 2
seperate disk. Only 2 disk is big enough to store chunks for the dbspace.
I
also create 4 temporary dbspace, 2 with default page and 2 with 16K page.
Spread in the 4 disk. The query performance feels still slow. a query for
a
year of data took 30 minutes.

Is there any suggestion to increase the performance in terms of onconfig
file?

Thank you.

*******************************************************************************

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