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VSAMs Control Interval..........

 
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kussu
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Joined: 16 May 2007
Posts: 33
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PostPosted: Mon Jun 25, 2007 7:25 pm    Post subject: VSAMs Control Interval..........
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Hi All,

"When a VSAM dataset is loaded, control intervals are created and records are written into them.

With KSDS clusters, the entire control interval is usually not filled. Some percentage of free space is left available for expansion.

With ESDS clusters, each control interval is completely filled before records are written into the next control interval in sequence.

With RRDS clusters, control intervals are filled with fixed-length slots, each containing either an active record or a dummy record. Slots containing dummy records are available for use when new records are added to the dataset."


I have read this some where ........and my doubt is :-
With ESDS, the new control interval is created only when the previous control interval is filled, and same as the case with RRDS[Only when the present control interval is filled with slots then only new control interval is created]

But i had a question about KSDS....
In the above they mentioned as , some free space will always be left available for expansion.....then when the new control interval is created for KSDS cluster???? or else KSDS uses only one control interval ????????

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William Thompson

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Location: Tucson AZ

PostPosted: Mon Jun 25, 2007 7:30 pm    Post subject:
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CI freespace is a define parameter, a new KSDS CI is considered full (and a new one created) when the percentage is reached. This is only observed during load.
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kussu
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PostPosted: Mon Jun 25, 2007 7:37 pm    Post subject: Re: VSAMs Control Interval..........
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Thanks William................ icon_biggrin.gif
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