ca.portal.admin

Re: WHAT is DB-MODE???

Discussion created by ca.portal.admin on Feb 20, 2008
Multitasking option of IDMS is implemented by categorizing
IDMS work into different states/MP Modes:
DB,DC,LOADER,DRIVER,USER and ANY.
All states/modes, except ANY, are single threaded in order to
preserve IDMS system internal structures and state integrity.
IDMS tasks in different MP modes can concurrently execute by
separate OS TCBs under control of the CV.
These TCBs can concurrently run on different CPUs of the machine.
This way, few tasks, but only one of each MP mode (except ANY),
can execute concurrently on separate CPUs.
Multiple tasks having MP mode of ANY (usually user programs)
are allowed to run concurrently with other tasks in any MP mode.

This is how concurrent CPU execution (more than one CPU
concurrently servicing a single IDMS CV Address Space), AKA
Multitasking, is achieved by IDMS.

HTH

Rafi Gefen
IDMS DBA

On Wed, Feb 20, 2008 at 6:48 PM, William M. Allen, Jr. <
archcons@bellsouth.net> wrote:
Hello All:



In this APAR is states ""DB MODE"" what is this?



APAR #: QO94231 DATE: 19 FEB 2008







PROBLEM DESCRIPTION: IDMS GETS A SEQUENCE ERROR IN THE JOURNAL.





------------------------------------------------------------

WITH A SYSTEM RUNNING IN DB MODE, IDMS MAY CAUSE A



SEQUENCE ERROR WITHIN THE JOURNAL. THIS WILL SHOW UP



IN THE ARCHIVE JOURNAL AS A SEQUENCE ERROR. AUTOMATIC



RECOVERY WILL FAIL. IF THE SYSTEM CRASHES, WARMSTART



WILL ALSO FAIL. BECAUSE THE JOURNALS CANNOT BE OFFLOADED



ROLLBACK OR ROLLFORWARD CANNOT BE RUN.







NOTE: THE LOWEST MAINTENANCE LEVEL TO WHICH THIS APAR



APPLIES IS SERVICE PACK SP00, GEN LEVEL 0103.









William M. Allen, Jr.

ARCH Consulting Associates, Ltd.

(704) 641-0296
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Normal

Normal
Re: New 16 Hypers QO94232/3
"There is one more Hyper to be applied after QO88564. The sequence of
applying these apars is:

First apply QO88564, then QO90057 and then QO94233.

For Service pack SP02, gen level 0502 and above


APAR #: QO88564
DATE: 21 JUN 2007PROBLEM DESCRIPTION: 1130 abend using BFOR DB
procedures

If a BFOR database procedure cancels a DML command
by setting the cancel indicator in the procedure
control block but returns an error status of zero
in the application control block an 1130 abend may
occur while the DBMS attempts to exit from the DML
command.

HYPER: NO

Dependencies
RESOLVING PTF QO90057
RESOLVING PTF QO94233
SUPERSEDES T5B0065

------------------------------------------------------------------------
-----------------

APAR #: QO90057
DATE: 8 AUG 2007PROBLEM DESCRIPTION: Transaction sharing 03 minor
code not returned

***NOTE*** This PTF corrects PE PTF QO88564
After application of QO88564 the use of transaction
sharing no longer recognizes concurrent updating of
a record occurrence between concurrent transactions
of a task. This results in a failure of the DBMS
to properly set an 03 minor code.
In non-transaction sharing systems this problem can
occasionally result in a delay in moving a record
from the database buffers on an OBTAIN command
causing a small performance impact.

HYPER: YES

Dependencies
PREREQUISITE QO88564
REQUISITE QO88564
SUPERSEDES T5B0105

------------------------------------------------------------------------
----------------

APAR #: QO94233
DATE: 19 FEB 2008PROBLEM DESCRIPTION: IDMS GETS A SEQUENCE ERROR IN
THE JOURNAL.

Systems using the IDMS Multitasking feature.
WITH A SYSTEM RUNNING IN DB MODE, IDMS MAY CAUSE A
SEQUENCE ERROR WITHIN THE JOURNAL. THIS WILL SHOW UP
IN THE ARCHIVE JOURNAL AS A SEQUENCE ERROR. AUTOMATIC
RECOVERY WILL FAIL. IF THE SYSTEM CRASHES, WARMSTART
WILL ALSO FAIL. BECAUSE THE JOURNALS CANNOT BE OFFLOADED
ROLLBACK OR ROLLFORWARD CANNOT BE RUN.

HYPER: YES

Dependencies
PREREQUISITE QO88564
REQUISITE QO88564
SUPERSEDES TD67858



Regards,
Paul Mak
Data Engineering Capability - DBA |
Applications Services Field Operations A&NZ|
Level 3, 36-46 George Street, Burwood, NSW 2134, AUSTRALIA |
Office: +61 2 9012 5434 | Mobile: +61 419 398 116 |
Fax: +61 2 9012 6612 | Email: paul.mak@eds.com |

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