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Release Freespace from VSAM datasets

 
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space_admin

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Joined: 04 Apr 2006
Posts: 7

PostPosted: Wed Apr 12, 2006 5:40 pm    Post subject: Release Freespace from VSAM datasets
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Hello together,

is there any reason NOT to release freespace from VSAM components? Here an example:

SPLITS-CI-------------93
SPLITS-CA--------------0
FREESPACE-%CI---------40
FREESPACE-%CA---------10
FREESPC-------2101248000

HI-A-RBA------2949120000
HI-U-RBA-------942243840

SPACE-TYPE------CYLINDER
SPACE-PRI-----------4000
SPACE-SEC------------300

What is a possible reason for this large freespace? When I calculate:
number ci-splits multiply with freespace per ci, I come to 2MB not to 2GB. That means in my opinion that the primary space is too large.

Now it is 1/3 full so why don't define a new cluster with 1/3 space and repro the data?

Are there any tools which release the space in a easier manner?

Kind regards,

space_admin
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martin9

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Joined: 01 Mar 2006
Posts: 287
Location: Basel, Switzerland

PostPosted: Wed Apr 12, 2006 6:53 pm    Post subject:
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hy space_admin,

i don't know any method to do this.
the FREESPACE %CI says only that this percentage
of space must be free or a control interval split will
automatically occur. the same for FREESPACE %CA,
what means analog to a CI, that this control area
automatically splits to fit the FREESPACE requirement.
if you think this is too large then minimize this value.
therefore create any new cluster with same size,
but with different FREESPACE values, and repro this.
but this decision is up to your choice...

martin9
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space_admin

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Joined: 04 Apr 2006
Posts: 7

PostPosted: Thu Apr 13, 2006 1:32 pm    Post subject: Re: Release Freespace from VSAM datasets
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hi martin9,

Quote:

hy space_admin,

i don't know any method to do this.


to do what?

I have a question to you:

For this dataset: what size is the minimum freespace of this data component?

Kind regards,

space_admin
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