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Concept of local and CV mode of IDMS

 
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cooldebi

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Joined: 19 Apr 2006
Posts: 18
Location: mumbai

PostPosted: Fri Jun 01, 2007 6:18 pm    Post subject: Concept of local and CV mode of IDMS
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Hi,
Can anybody explain me the concept of local and CV mode of IDMS?

Regards
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tosaurabh20

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Joined: 08 Jun 2007
Posts: 26
Location: Noida

PostPosted: Tue Jun 19, 2007 4:49 pm    Post subject: Re: local and Cv mode of IDMS
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cooldebi wrote:
Hi,
Can anybody explain me the concept of local and CV mode of IDMS?

Regards


Hi,

There is lot of difference between the functionality of Local mode and CV mode, i will highlight them to you.

Local mode: This mode is basically used during the batch cycle specially when regions are down (link for Business user to work on screens is not available). In this mode the database got directly updated thus in case of any abends, Restore process needs to get run to resume the image of database to pre backup. If a job is running in local mode and utilising some resources and other job also requires same then those resources wont get allocated until previous jobs finishes its processing.

CV mode : This is basically termed as Central Version mode. There will be an Central Version image of database which will be available to make updates. Usually jobs runs in this mode when the regions are up which means it provides a provision of concurrent updates on the database. In this mode each update will be made into Journal and then from Journal database got updated.Concurrency is maintained in this mode means at a time two users can update same record. Also there is no need to run the restores in case of abends, image can be rollbacked to last committed record and job can get re run from there.

Hope this will clear your query.

Let me know in case of any issues.

Thanks
Saurabh
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mjshaheed

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Joined: 09 Apr 2007
Posts: 25
Location: Chennai,India

PostPosted: Thu Jun 21, 2007 3:03 pm    Post subject:
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Hi Saurabh,

Thanks for the detailed explanation.
Can you please tell us how we can differentiate a job that runs on local mode from a job that runs on CV mode?

Thanks,
Shahul
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tosaurabh20

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Joined: 08 Jun 2007
Posts: 26
Location: Noida

PostPosted: Thu Jun 21, 2007 3:21 pm    Post subject: Can you please tell us how to differentiate b/w CV or local?
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mjshaheed wrote:
Hi Saurabh,

Thanks for the detailed explanation.
Can you please tell us how we can differentiate a job that runs on local mode from a job that runs on CV mode?

Thanks,
Shahul



Hi,

There can be many ways through which one can differentiate between local mode and CV mode jobs. It all depeneds on business specifications provided.

Normally CV mode jobs have a system control information which will have information about the region Central version on which updates are going to happen.

Also there is one method of including some of the libraries which will help you to know whether those libraries are for local mode or CV mode. Normally by convention local mode libraries have "JN" as extension in their name and CV mode as "CV".

But there is no such hard and fast rule that above those two points are followed. It all depends on the conventions followed in your project.

Hope it clear your doubts.

Thanks and Regards
Saurabh
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mjshaheed

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Posts: 25
Location: Chennai,India

PostPosted: Fri Jun 22, 2007 4:31 pm    Post subject: Can you please tell us how to differentiate b/w CV or local
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Hi Saurabh,

Thanks for ur timely reply.
It cleared most of my doubts on Local Mode Vs CV mode.

Thanks,
Shahul
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