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IDS Forum

Re: rowsize versus pagesize

Posted By: Richard Snoke
Date: Wednesday, 8 July 2009, at 10:34 a.m.

In Response To: rowsize versus pagesize (KAMRAN HAQ)

Hi,

The major question is "what problem are you trying to solve?" If things
are working acceptably well, why do you think a change will improve
things?

In general, getting the entire row on a single page will improve
performance as long as that change does not interfere with other things.
So you must have enough memory to allocate a second buffer pool without
affecting the operation of the current buffer pool or other processes on
the system. Without that extra memory, the change may very well make
things worse.

Only one buffer pool of each page size is allowed at this point. I hope
that will change in some future release, but for now only one pool of each
page size is allowed.

I think I'd choose 4KB pages and live with whatever space is wasted
because each row access would require only a single I/O. For 2KB pages,
each row access requires at least 2 (possibly more) I/O's. If the memory
is available for the second buffer pool, that I/O reduction ought to
improve things some. However, if you're not I/O-bound now, then you may
not see any improvement.

I might also consider no change to the table, but rather put the indexes
in 4 KB pages to make the index operations more efficient. But whether
that improves things depends on whether or not your indexes are not
optimal right now.

So it all depends on exactly what problem you're attempting to solve.

Cheers,
Dick Snoke
IBM Data Management - ChannelWorks
dsnoke@us.ibm.com
(404) 487-1595

From:
"KAMRAN HAQ" <khaq@i2cinc.com>
To:
ids@iiug.org
Date:
07/08/09 08:18 AM
Subject:
rowsize versus pagesize [16258]
Sent by:
ids-bounces@iiug.org

Hi,
If a table's lockmode is row level and its rowsize is 3.5K, then what is
better in regard of performance:
1- place the table in a tablespace with 2K pagesize
2- place the table in a tablespace with 4K pagesize
3- place the table in a tablespace with pagesize bigger than 4K
for an OTLP enviornment. Also can we make more than one bufferpool of same

pagesize.
We are using IDS 11.5 FC4 on Solaris sparc.
regards,
Kamran

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