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  3. April 2006

Re: *Max4GB or *Max1TB

Hi Paul
I searched the iSeries support site for ACCPTHSIZ and found a couple things. One has to do with access path sharing--
In R410, the default for Access path size (ACCPTHSIZ) changed to *MAX1TB rather than *MAX4GB on the CRTLF and CRTPF commands and in the SQL CREATE INDEX statement. Most existing access paths have an attribute of *MAX4GB. These access paths cannot be shared by access paths with an attribute of *MAX1TB. For access path sharing to occur, change existing access paths to ACCPTHSIZ(*MAX1TB) or specify ACCPTHSIZ(*MAX4GB) on the new access paths.
The other is from "The System Administrator's Companion to AS/400 Availability and Recovery" Redbook http://www.redbooks.ibm.com/redbooks/pdfs/sg242161.pdf section 16.14, where it says the 4-byte index is supposed to circumvent seize locks. It also says not to mix the 2 kinds of indexes. 

HTH
Vern

At 10:16 AM 4/8/2006, you wrote:


I've got a client experiencing performance problems with his software
package. Many of the files have a huge number of logicals built over them
for various purposes. One has over 250 logicals and joined logicals. All
of the files are defined as having an acces path size of 4GB.

This system is also being hit with lots of ODBC requests that were
permitted to be built by the previous IT manager (windoze bigot).

I know how to throttle back the ODBC impact, but should I change the acces
path size to 1TB for just the logicals or both the physical and its
associated logicals to improve the overall performance?

Thanks
--

Paul Nelson
Arbor Solutions, Inc.
708-670-6978  Cell
pnelson@xxxxxxxxxx
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