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Information required on VSAM Keywords LOG/LOGSTREAMID

 
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harsh singh

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Joined: 11 Dec 2007
Posts: 26
Location: INDIA

PostPosted: Wed Aug 26, 2009 11:07 am    Post subject: Information required on VSAM Keywords LOG/LOGSTREAMID
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Hello All,
I have little knowledge on keyword LOG/ LOGSTREAMID while defining a VSAM Cluster. As far as i believe is that these keywords are basically defined in Define CLUSTER Command for Recover purpose. In SOme of the IBm Manual i received information that they are used for RLS File.
What I am not sure is the below doubts which i am thinking ?

IS these keywords are only restricted/confined to RLS file or can we use these keywords in normal VSAM file as well (KSDS,ESDS etc) ?

In DEFINE CLUSTER Command we use Recovery/ Reuse for the recovery purpose, are these keywords not used while defining RLS VSAM File ?

What is the major difference between LOG (UNDO0 and LOG (ALL) ?

What is forward and backout recovery ?

Thank you for your help in advance. icon_smile.gif
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expat

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Joined: 14 Mar 2007
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Location: Back in jolly old England

PostPosted: Wed Aug 26, 2009 11:24 am    Post subject:
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Those are RLS keywords.

To read the IDCAMS manual, Click HERE
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harsh singh

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Joined: 11 Dec 2007
Posts: 26
Location: INDIA

PostPosted: Wed Aug 26, 2009 11:36 am    Post subject:
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Thanks for replying EXPAT, i have gone through the manual suggested by you but still i am not able to convince my self on below queries

In DEFINE CLUSTER Command we use Recovery/ Reuse for the recovery purpose, are these keywords not used while defining RLS VSAM File ?

I know it is painful but can you please throw some light on it ?

Thank you for your help
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expat

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Location: Back in jolly old England

PostPosted: Wed Aug 26, 2009 11:46 am    Post subject:
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The VSAM options are usually given in an example of creating a RLS dataset for whatever product is going to use RLS.

I usually just copy the definition from the manual, change names and DASD allocations and let it get on. I can't really say that I have paid too much attention to what is in the cluster definitions just so long as it works.
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