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hiravibk
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Joined: 14 Dec 2008
Posts: 107
Location: India
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Hi All,
We have a set of many VSAM files in our application. There will be online and batch updates to these VSAM files everyday. I am assigned to develop a tool or a job which can tell the percentage of space the VSAM file has used.
I found a post in IBMMAINFRAMES that the below formula from the information from IDCAMS for a VSAM file:
(HI-U-RBA/HI-A-RBA)*100
gives the usage percentage. But this will give the usage for one extent only. Can someone please let me know how to go about finding the exact way to approach this? I apologize if this is a repost, i didnt find a previous post on this. |
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expat
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Joined: 14 Mar 2007
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Location: Welsh Wales
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| Why do you say that the statistics are for one extent only |
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hiravibk
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Location: India
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I checked with the Storage management group here and this is the reply I got from them. They were not very generous to let me know how exactly to go about the approach  |
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expat
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Then all I can say is that your storage management should not be allowed to manage the storage environment.
In fact they do not sound bright enough to be allowed to go to the toilet unsupervised.
Take a good look at the output from a listcat and see what you can find. |
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hiravibk
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Posts: 107
Location: India
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Hi expat,
So are you saying that the formula that I have given is correct for a KSDS VSAM file?
Below is the LISTCAT info for one of the files:
| Code: |
IDCAMS SYSTEM SERVICES
SPACE-TYPE------CYLINDER HI-A-RBA-----12510904320
SPACE-PRI-----------1100 HI-U-RBA-----12432752640
SPACE-SEC------------550 |
Please let me know if I need to consider any other options from LISTCAT. I also need to add that a REORG is done on a weekly basis to all the VSAM files in our system. |
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PeterHolland
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Joined: 27 Oct 2009
Posts: 2481
Location: Netherlands, Amstelveen
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| Redbook "VSAM Demystified" will give you some nice information. |
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expat
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Location: Welsh Wales
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It's the very same one that I have used for 20+ years with no problems.
As for reorganising the file on a weekly basis - is it really worth it. Almost certainly not from a performance view. Possibly from a space reclamation view. |
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hiravibk
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Joined: 14 Dec 2008
Posts: 107
Location: India
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Thanks expat, I will go ahead and use the same formula.
Thank you Peter for the document, it looks really good.
| Code: |
STATISTICS
REC-TOTAL---------916195 SPLITS-CI----------13333
REC-DELETED-------169187 SPLITS-CA------------290
REC-INSERTED------369899 FREESPACE-%CI---------15
REC-UPDATED------2679357 FREESPACE-%CA---------15
REC-RETRIEVED--655260325 FREESPC--------288489472
USER-DATA-SIZE-----------------------------1191053500 |
| Code: |
STATISTICS
REC-TOTAL------------694 SPLITS-CI------------290
REC-DELETED------------0 SPLITS-CA--------------6
REC-INSERTED-----------0 FREESPACE-%CI----------0
REC-UPDATED---------2760 FREESPACE-%CA----------0
REC-RETRIEVED---------69 FREESPC-----------428032 |
I also see two 'FREESPC' in the listcat entry. Will this parameter help in anyway or is it something else. Also, I am confused why we have two entries with different values for this. |
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PeterHolland
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Location: Netherlands, Amstelveen
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| I guess one is for the data component and one is for the index component? |
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hiravibk
Warnings : 1
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Joined: 14 Dec 2008
Posts: 107
Location: India
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I have not worked on REXX, can comeone help me with the REXX code for this.
Thanks! |
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expat
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Posts: 8797
Location: Welsh Wales
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| hiravibk wrote: |
| I have not worked on REXX, can comeone help me with the REXX code for this. |
Well, that is rather a little handicap - not having worked with REXX before.
At the top of the CLIST / REXX forum is a sticky with links to all of the manuals that you are likely ever to need for REXX. Have a read and a try yourself and we will be happy to help those that try to help themselves. |
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