Re: Index advisor (was RE: Interactive memory pool...how much to allocate per user?)

There are several good redbooks on SQL performance and tuning.

Start with : SQL Performance Diagnoisis on IBM DB2 - SG24-6654-00. It's a bit old (2006) but still has very good information in it.

Another good one is : IBM DB2 for i indexing methods and strategies by Michael Cain and Kent Milligan. (2011)

If you google a bit you will find several more good references.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 12/10/2012 11:41 AM, Porterfield, Sean wrote:

Interesting stuff. It immediately informed me of a "new" SQLRPGLE program I didn't know about. I'm not really sure of the rules the index advisor (or SQE) uses. One suggestion on a key matches the first key in an existing logical file that has multiple keys and no select/omit. It's odd to me that it wouldn't just use that file. Though it does suggest "Binary Radix" for the index type in case that makes a difference.

Some others match as well, but most I found are logicals over multiple physical files or contain select/omit that might not match.

If it says "Estimated Index Creation Time" is 19:12:15, is that over 19 hours?
--
Sean Porterfield

-----Original Message-----
From:midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim Oberholtzer
Sent: Monday, December 10, 2012 11:28
To: Midrange Systems Technical Discussion
Subject: Re: Interactive memory pool...how much to allocate per user?

OK, that completes some of the picture. The Quadrant and Compleo are most likely using quite a bit of SQL, as are the the stored procedures of course. That would explain quite a bit of the *MACHINE and *BASE faulting.

With Navigator, check out the advised indexes, and see if there are some indexes taking over about 10 seconds to build being created routinely.
Consider building them permanently. Also, the prestart jobs QSQSRVR and QZDASOINIT should be moved into a shared pool away from *BASE. That will help a bunch.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects