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[VIGNESH]

[b]Hi All,

Could you please clarify me, is it possible to update the IDMS record in the Local mode.If possible, then pls clarify me the difference between the central version and local mode.

Why we are using SYSCTL card in the Central version.

Many thanks in Advance,
Vignesh.

[shiv_swami]

Yes Vignesh.

1. Irrespective of what mode you are running a job,you can update an IDMS record.

2. CV vs Local -
All batch jobs run either under CV (Central Version) or in Local mode.
CV provides lock protection, journaling, etc...
You should take backups before running a local-update job.
When you are runnning an update job in LOCAL mode,you explicitly have the CV/Region down and you get exclusive rights to update the database.If you submit the job in local mode when CV is up you will get idms error code of 0966.
Report jobs are often run in local mode (no backup needed). Local is more efficient because it doesn't have the overhead of the CV.

Hope this helps
_________________
Regards,
Shivprakash

[arunkumar_e]

Hi Vignesh,
Hope this information answers your question !!

An IDMS system is called a Central Version, or CV for short. It is common to say that the test CV will come down at 9 pm and back up at 6 am. When the IDMS CV is down, IDMS programmer testing may be limited. Some sites have different CVs for different applications, for instance a development CV, a maintenance CV, a Y2K Conversion CV, and a production CV.

IDMS programs can run in LOCAL-MODE or under the CV. When running under the CV, all database I/O is done by by the Central Version (one task running on the computer). Usually, for the sake of speed, retrieval only jobs run in local-mode, and update jobs run under the CV to allow for concurrent update and record locking.

While update jobs can be run in local mode, this feature is seldom used because the areas must be varied out of update mode - thus preventing online and other batch jobs from concurrent update.

This is sometimes done on weekends to speed up long running batch jobs.
Running under the CV incurs typical DBMS overhead such as journalling, buffering (of other jobs), and record-locking. All online programs always run under the CV.

Cheers !!
_________________
Arun
"Genius is one percent inspiration and ninety-nine percent perspiration." -- Thomas A. Edison

[arunkumar_e]

In Addition to the above,
Most sites use the presence of a //SYSCTL JCL statement to indicate that the
job is running under the CV.
_________________
Arun
"Genius is one percent inspiration and ninety-nine percent perspiration." -- Thomas A. Edison