ca.portal.admin

Re: Diagnostics and Symbol tables - another question

Discussion created by ca.portal.admin on Jan 31, 2008
for a load area member,:

Description: The DPROG-171 record type is used by the CA-IDMS/DC online
debugger. Each DPROG-171 occurrence represents a program load module
for which a symbol table has been established. Currently, symbol tables
can be established only for CA-ADS dialogs.


Chris Hoelscher
Senior IDMS & DB2 Database Administrator Humana Inc
502-476-2538
choelscher@humana.com



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Re: ONE LARGE DMCL BUFFER
"Large buffers and real-time determination of buffer use is the way of
the future. However, I would create three very large buffers,
proportionate to representation. One for pages over 20k, one for over
10k, and one for smaller page sizes. It depends of course on how many
of each there are in your idms installation.

IDMS has quite sophisticated buffer management techniques involving hash
counts, frequent usage, etc. No dba can preconfigure one ideal buffer
configuration to suit all real-time buffer requirements. The opponents
of large buffers claim that highly used data is victimized by less used
data. However, this makes for underutilized resources and prevents
intelligent management by a machine on an nanno-second basis. Some
folks are comfortable with the typewriter too, still.

Lutz Petzold
TDM UDB/IDMS Support
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Re: ONE LARGE DMCL BUFFER
"Hi Bill:

I've heard the 'one large buffer' proposal a couple of times. In fact, the
DBA Admin guide says 'one large buffer if often adequate...'.

In practice, I've always proposed one buffer pool per page size, and then
tune from there (high use, index areas, etc.). A 32K pagesize buffer pool
would seem to be inefficient for page sizes less than 32K, since a given
buffer 'page' can only contain one database 'page' (at least that's the way
it was in the last century...).

Even for local mode, a huge buffer pool may not be necessary, and may
actually increase cycles, particularly if the process is doing an area
sweep. In a 'pure area sweep' process, a buffer pool of 3 pages would be
more than adequate and reduce the overhead of allocating/maintaining a large
buffer pool.

Just my 2cents, but I always thought that DMCL buffering for CV was part
engineering and magic, and that multiple local mode DMCL's were perfectly
legit for different processing needs.

Regards,

Tom Schoenborn

----- Original Message -----
From: ""Bill Allen"" <ARCHCONB@AOL.COM>
To: <IDMS-L@LISTSERV.IUASSN.COM>
Sent: Thursday, January 31, 2008 10:21 AM
Subject: ONE LARGE DMCL BUFFER

Hello All:

What are your thought on one very large buffer in a DMCL for CV mode and
LOCAL mode, for example 15,000 pages at 32K per page?

If you can please comment on the memory requirements, CPU Cycles, etc.

Thanks in advance for your time and support.

Bill Allen




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Re: Diagnostics and Symbol tables - another question
"Dan,

Look at the PROGCMT_050 hanging from the PROG_051. I have position 11
for symbol table and position 13 for the diagnostics. Look in the
reference guide 3.94 for PROGCMT_050. S in the 11th position is symbol
on and D in the 13th position is diagnostic is on.

Chris Wood
Alberta Department of Energy
CANADA

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