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VSAM Space Allocation

 
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mrgnndhmk

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Joined: 01 Feb 2006
Posts: 49
Location: India

PostPosted: Sat Apr 22, 2017 12:42 am    Post subject: VSAM Space Allocation
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Hi All,
I searched in the forum for my answers but I did not quite get it. Therefore, posting the questions.

1. In LISTCAT, I have the following scenarios
Code:

1. HI-A-RBA = HI-U-RBA  and FREESPC > 0
2. HI-A-RBA <> HI-U-RBA and FREESPC <> (HI-A-RBA - HI-U-RBA)
3. HI-A-RBA <> HI-U-RBA and FREESPC = (HI-A-RBA - HI-U-RBA))


On what basis FREESPC could be different from HI-A-RBA - HI-U-RBA?

Should I take the RBA from Allocation section or the Volume section?

Ultimately I want one single method to compute the Free Space/Used Space for the VSAM Files.


I have given example for each of the above scenario

Scenario 1 (Data) & 3 (Index):

Code:

  LISTCAT ENTRIES(PAD.ADPOUR.KSDS                             ) ALL
0CLUSTER ------- PAD.ADPOUR.KSDS
      IN-CAT --- UCAT.ORDER.PROD
      HISTORY
        DATASET-OWNER-----(NULL)     CREATION--------2010.241
        RELEASE----------------2     EXPIRATION------0000.000
      SMSDATA
        STORAGECLASS -------PROD     MANAGEMENTCLASS-----PROD
        DATACLASS --------(NULL)     LBACKUP ---0000.000.0000
        CA-RECLAIM---------(YES)
        EATTR-------------(NULL)
        BWO STATUS------00000000     BWO TIMESTAMP---00000 00:00:00.0
        BWO---------------(NULL)
      RLSDATA
        LOG ----------------(NULL)   RECOVERY REQUIRED --(NO)     FRLOG ------------(NULL)
        VSAM QUIESCED -------(NO)    RLS IN USE ---------(NO)     LOGREPLICATE-------------(NO)
0       LOGSTREAMID-----------------------------(NULL)
        RECOVERY TIMESTAMP LOCAL-----X'0000000000000000'
        RECOVERY TIMESTAMP GMT-------X'0000000000000000'
      PROTECTION-PSWD-----(NULL)     RACF----------------(NO)
      ASSOCIATIONS
        DATA-----PAD.ADPOUR.DATA
        INDEX----PAD.ADPOUR.INDEX
0   DATA ------- PAD.ADPOUR.DATA
      IN-CAT --- UCAT.ORDER.PROD
      HISTORY
        DATASET-OWNER-----(NULL)     CREATION--------2010.241
1IDCAMS  SYSTEM SERVICES                                           TIME: 14:37:40        04/21/17     PAGE      4
0       RELEASE----------------2     EXPIRATION------0000.000
        ACCOUNT-INFO-----------------------------------(NULL)
      PROTECTION-PSWD-----(NULL)     RACF----------------(NO)
      ASSOCIATIONS
        CLUSTER--PAD.ADPOUR.KSDS
      ATTRIBUTES
        KEYLEN-----------------6     AVGLRECL--------------30     BUFSPACE-----------40960     CISIZE-------------18432
        RKP--------------------0     MAXLRECL--------------30     EXCPEXIT----------(NULL)     CI/CA-----------------45
        SHROPTNS(2,3)      SPEED     UNIQUE           NOERASE     INDEXED       NOWRITECHK     UNORDERED        NOREUSE
        NONSPANNED
      STATISTICS
        REC-TOTAL----------37331     SPLITS-CI--------------4     EXCPS---------------1370
        REC-DELETED----------187     SPLITS-CA--------------1     EXTENTS----------------3
        REC-INSERTED---------332     FREESPACE-%CI----------1     SYSTEM-TIMESTAMP:
        REC-UPDATED------------0     FREESPACE-%CA----------0          X'C83F9CD5A79A3280'
        REC-RETRIEVED-------3743     FREESPC----------1271808
      ALLOCATION
        SPACE-TYPE------CYLINDER     HI-A-RBA---------2488320
        SPACE-PRI--------------1     HI-U-RBA---------2488320
        SPACE-SEC--------------1
      VOLUME
        VOLSER------------DOF087     PHYREC-SIZE--------18432     HI-A-RBA---------2488320     EXTENT-NUMBER----------3
        DEVTYPE------X'3010200F'     PHYRECS/TRK------------3     HI-U-RBA---------2488320     EXTENT-TYPE--------X'00'
        VOLFLAG------------PRIME     TRACKS/CA-------------15
        EXTENTS:
        LOW-CCHH-----X'003E0000'     LOW-RBA----------------0     TRACKS----------------15
        HIGH-CCHH----X'003E000E'     HIGH-RBA----------829439
        LOW-CCHH-----X'00440000'     LOW-RBA-----------829440     TRACKS----------------15
        HIGH-CCHH----X'0044000E'     HIGH-RBA---------1658879
        LOW-CCHH-----X'00610000'     LOW-RBA----------1658880     TRACKS----------------15
        HIGH-CCHH----X'0061000E'     HIGH-RBA---------2488319
0   INDEX ------ PAD.ADPOUR.INDEX
      IN-CAT --- UCAT.ORDER.PROD
      HISTORY
        DATASET-OWNER-----(NULL)     CREATION--------2010.241
        RELEASE----------------2     EXPIRATION------0000.000
      PROTECTION-PSWD-----(NULL)     RACF----------------(NO)
      ASSOCIATIONS
        CLUSTER--PAD.ADPOUR.KSDS
      ATTRIBUTES
        KEYLEN-----------------6     AVGLRECL---------------0     BUFSPACE---------------0     CISIZE--------------1024
        RKP--------------------0     MAXLRECL------------1017     EXCPEXIT----------(NULL)     CI/CA-----------------33
        SHROPTNS(2,3)   RECOVERY     UNIQUE           NOERASE     NOWRITECHK     UNORDERED     NOREUSE
      STATISTICS
        REC-TOTAL--------------4     SPLITS-CI--------------1     EXCPS----------------432     INDEX:
        REC-DELETED------------0     SPLITS-CA--------------0     EXTENTS----------------1     LEVELS-----------------2
        REC-INSERTED-----------0     FREESPACE-%CI----------0     SYSTEM-TIMESTAMP:            ENTRIES/SECT-----------6
        REC-UPDATED------------6     FREESPACE-%CA----------0          X'C83F9CD5A79A3280' SEQ-SET-RBA----------------0
        REC-RETRIEVED----------0     FREESPC------------29696                              HI-LEVEL-RBA------------2048
      ALLOCATION
1IDCAMS  SYSTEM SERVICES                                           TIME: 14:37:40        04/21/17     PAGE      5
0       SPACE-TYPE---------TRACK     HI-A-RBA-----------33792
        SPACE-PRI--------------1     HI-U-RBA------------4096
        SPACE-SEC--------------1
      VOLUME
        VOLSER------------DOF087     PHYREC-SIZE---------1024     HI-A-RBA-----------33792     EXTENT-NUMBER----------1
        DEVTYPE------X'3010200F'     PHYRECS/TRK-----------33     HI-U-RBA------------4096     EXTENT-TYPE--------X'00'
        VOLFLAG------------PRIME     TRACKS/CA--------------1
        EXTENTS:
        LOW-CCHH-----X'000B0007'     LOW-RBA----------------0     TRACKS-----------------1
        HIGH-CCHH----X'000B0007'     HIGH-RBA-----------33791
1IDCAMS  SYSTEM SERVICES                                           TIME: 14:37:40        04/21/17     PAGE      6
0         THE NUMBER OF ENTRIES PROCESSED WAS:
                    AIX -------------------0
                    ALIAS -----------------0
                    CLUSTER ---------------1
                    DATA ------------------1
                    GDG -------------------0
                    INDEX -----------------1
                    NONVSAM ---------------0
                    PAGESPACE -------------0
                    PATH ------------------0
                    SPACE -----------------0
                    USERCATALOG -----------0
                    TAPELIBRARY -----------0
                    TAPEVOLUME ------------0
                    TOTAL -----------------3
0         THE NUMBER OF PROTECTED ENTRIES SUPPRESSED WAS 0
0IDC0001I FUNCTION COMPLETED, HIGHEST CONDITION CODE WAS 0
0


Scenario 2 (Data) & 3 (Index):

Code:

  LISTCAT ENTRIES(PAD.ADRSLT.KSDS                             ) ALL
0CLUSTER ------- PAD.ADRSLT.KSDS
      IN-CAT --- UCAT.ORDER.PROD
      HISTORY
        DATASET-OWNER-----(NULL)     CREATION--------2010.241
        RELEASE----------------2     EXPIRATION------0000.000
      SMSDATA
        STORAGECLASS -------PROD     MANAGEMENTCLASS-----PROD
        DATACLASS --------(NULL)     LBACKUP ---0000.000.0000
        CA-RECLAIM---------(YES)
        EATTR-------------(NULL)
        BWO STATUS------00000000     BWO TIMESTAMP---00000 00:00:00.0
        BWO---------------(NULL)
      RLSDATA
        LOG ----------------(NULL)   RECOVERY REQUIRED --(NO)     FRLOG ------------(NULL)
        VSAM QUIESCED -------(NO)    RLS IN USE ---------(NO)     LOGREPLICATE-------------(NO)
0       LOGSTREAMID-----------------------------(NULL)
        RECOVERY TIMESTAMP LOCAL-----X'0000000000000000'
        RECOVERY TIMESTAMP GMT-------X'0000000000000000'
      PROTECTION-PSWD-----(NULL)     RACF----------------(NO)
      ASSOCIATIONS
        DATA-----PAD.ADRSLT.DATA
        INDEX----PAD.ADRSLT.INDEX
0   DATA ------- PAD.ADRSLT.DATA
      IN-CAT --- UCAT.ORDER.PROD
      HISTORY
        DATASET-OWNER-----(NULL)     CREATION--------2010.241
1IDCAMS  SYSTEM SERVICES                                           TIME: 14:37:40        04/21/17     PAGE      7
0       RELEASE----------------2     EXPIRATION------0000.000
        ACCOUNT-INFO-----------------------------------(NULL)
      PROTECTION-PSWD-----(NULL)     RACF----------------(NO)
      ASSOCIATIONS
        CLUSTER--PAD.ADRSLT.KSDS
      ATTRIBUTES
        KEYLEN----------------11     AVGLRECL-------------640     BUFSPACE-----------43008     CISIZE--------------7168
        RKP--------------------8     MAXLRECL-------------640     EXCPEXIT----------(NULL)     CI/CA----------------105
        SHROPTNS(2,3)      SPEED     UNIQUE           NOERASE     INDEXED       NOWRITECHK     UNORDERED        NOREUSE
        NONSPANNED
      STATISTICS
        REC-TOTAL---------278105     SPLITS-CI--------------0     EXCPS---------------2152
        REC-DELETED------------0     SPLITS-CA--------------0     EXTENTS----------------1
        REC-INSERTED-----------0     FREESPACE-%CI---------23     SYSTEM-TIMESTAMP:
        REC-UPDATED------------0     FREESPACE-%CA----------8          X'CD5BB12953A60E00'
        REC-RETRIEVED----------0     FREESPC---------40578048
      ALLOCATION
        SPACE-TYPE------CYLINDER     HI-A-RBA-------289766400
        SPACE-PRI------------385     HI-U-RBA-------270197760
        SPACE-SEC-------------43
      VOLUME
        VOLSER------------DOF332     PHYREC-SIZE---------7168     HI-A-RBA-------289766400     EXTENT-NUMBER----------1
        DEVTYPE------X'3010200F'     PHYRECS/TRK------------7     HI-U-RBA-------270197760     EXTENT-TYPE--------X'40'
        VOLFLAG------------PRIME     TRACKS/CA-------------15
        EXTENTS:
        LOW-CCHH-----X'03E10000'     LOW-RBA----------------0     TRACKS--------------5775
        HIGH-CCHH----X'0561000E'     HIGH-RBA-------289766399
0   INDEX ------ PAD.ADRSLT.INDEX
      IN-CAT --- UCAT.ORDER.PROD
      HISTORY
        DATASET-OWNER-----(NULL)     CREATION--------2010.241
        RELEASE----------------2     EXPIRATION------0000.000
      PROTECTION-PSWD-----(NULL)     RACF----------------(NO)
      ASSOCIATIONS
        CLUSTER--PAD.ADRSLT.KSDS
      ATTRIBUTES
        KEYLEN----------------11     AVGLRECL---------------0     BUFSPACE---------------0     CISIZE--------------2048
        RKP--------------------8     MAXLRECL------------2041     EXCPEXIT----------(NULL)     CI/CA-----------------21
        SHROPTNS(2,3)   RECOVERY     UNIQUE           NOERASE     NOWRITECHK     UNORDERED     NOREUSE
      STATISTICS
        REC-TOTAL------------362     SPLITS-CI--------------0     EXCPS---------------1814     INDEX:
        REC-DELETED------------0     SPLITS-CA--------------0     EXTENTS----------------1     LEVELS-----------------3
        REC-INSERTED-----------0     FREESPACE-%CI----------0     SYSTEM-TIMESTAMP:            ENTRIES/SECT----------10
        REC-UPDATED------------0     FREESPACE-%CA----------0          X'CD5BB12953A60E00' SEQ-SET-RBA----------------0
        REC-RETRIEVED----------0     FREESPC-----------118784                              HI-LEVEL-RBA----------415744
      ALLOCATION
        SPACE-TYPE---------TRACK     HI-A-RBA----------860160
        SPACE-PRI-------------20     HI-U-RBA----------741376
        SPACE-SEC--------------3
      VOLUME
1IDCAMS  SYSTEM SERVICES                                           TIME: 14:37:40        04/21/17     PAGE      8
0       VOLSER------------DOF332     PHYREC-SIZE---------2048     HI-A-RBA----------860160     EXTENT-NUMBER----------1
        DEVTYPE------X'3010200F'     PHYRECS/TRK-----------21     HI-U-RBA----------741376     EXTENT-TYPE--------X'00'
        VOLFLAG------------PRIME     TRACKS/CA--------------1
        EXTENTS:
        LOW-CCHH-----X'00300000'     LOW-RBA----------------0     TRACKS----------------20
        HIGH-CCHH----X'00310004'     HIGH-RBA----------860159
1IDCAMS  SYSTEM SERVICES                                           TIME: 14:37:40        04/21/17     PAGE      9
0         THE NUMBER OF ENTRIES PROCESSED WAS:
                    AIX -------------------0
                    ALIAS -----------------0
                    CLUSTER ---------------1
                    DATA ------------------1
                    GDG -------------------0
                    INDEX -----------------1
                    NONVSAM ---------------0
                    PAGESPACE -------------0
                    PATH ------------------0
                    SPACE -----------------0
                    USERCATALOG -----------0
                    TAPELIBRARY -----------0
                    TAPEVOLUME ------------0
                    TOTAL -----------------3
0         THE NUMBER OF PROTECTED ENTRIES SUPPRESSED WAS 0
0IDC0001I FUNCTION COMPLETED, HIGHEST CONDITION CODE WAS 0
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Rohit Umarjikar

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Joined: 21 Sep 2010
Posts: 1717
Location: NY,USA

PostPosted: Sat Apr 22, 2017 12:54 am    Post subject:
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Please see if you learn anything from here.
VSAM Demystified
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Robert Sample

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Location: East Dubuque, Illinois, USA

PostPosted: Sat Apr 22, 2017 7:31 am    Post subject:
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First, remember that there is CI freespace and CA freespace. If you specify CI freespace of 20%, that means 20% of each CI is left without any data. If the CI size is 4096 that means about (the VSAM Demystified manual will give you the exact calculation) 820 bytes of each CI is free; if the HI-A-RBA and HI-U-RBA are the same, there is STILL 20% freespace in each CI (unless of course splits occurred).

Second, freespace may be used for records as inserts are done, so freespace may be less than HI-A-RBA minus HI-U-RBA.

Third, freespace in the CI may cause the freespace to be more than HI-A-RBA minus HI-U-RBA.

Quote:
Should I take the RBA from Allocation section or the Volume section?
If you use the Volume section, you will need to find the highest single RBA value (there are a low and high RBA for EACH extent on the volume - if there are more than one volume, you will need to find the highest RBA on ALL volumes). If you compare the Allocation and Volume sections for the LISTCAT output you posted, you will see the HI-A-RBA matches the largest Volume RBA (as long as you add 1 to the Volume RBA). So it doesn't matter which you take as long as you pick the largest Volume RBA.
Quote:
Ultimately I want one single method to compute the Free Space/Used Space for the VSAM Files.
Subtract free space from HI-A-RBA to give Used space (ignore HI-U-RBA). Divide free space by used space. Two simple calculations, one method. Now the question is, what are you going to do with this number? It has little, if any, practical value. Free space needs to be driven by the application; some applications don't need free space while other applications should have substantial CI free space but little CA free space or vice versa and other applications need substantial CI and CA free space.
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mrgnndhmk

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Joined: 01 Feb 2006
Posts: 49
Location: India

PostPosted: Tue May 02, 2017 6:44 pm    Post subject:
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Thanks Robert - you made the explanation easier.

After reading yours, VSAM Demystified looks demystified.

The reason I come to this forum is, to me you guys are better than the books in simplifying the explanations icon_smile.gif

Coming to the question on the calculation
- This calculation helps me to identify files which can cause failures potentially based on how it is growing and how it is used.

We have around 1000+ files (KSDS & ESDS) and since our Mainframe is quite stable, we identified only 50+ files which need the redefinition.

More questions
1. Will LISTCAT produce correct result on a file irrespective of whether that file is used by a Job or CICS at the time of issuing LISTCAT?
2. Records Retrieved for Index Component - A file read on DATA internally uses index to retrieve the record. Would this not update the Records Retrieved for Index Component?

~Muru
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Robert Sample

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PostPosted: Tue May 02, 2017 8:16 pm    Post subject:
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Quote:
1. Will LISTCAT produce correct result on a file irrespective of whether that file is used by a Job or CICS at the time of issuing LISTCAT?
No -- if the LISTCAT output has asterisks beside the fields, then they are not accurate and may be changed when the task using the VSAM data set closes it.
Code:
 STATISTICS  (* - VALUE MAY BE INCORRECT)                                                     
   REC-TOTAL------------844*    SPLITS-CI-------------22*    EXCPS---------------6378*         
   REC-DELETED----------620*    SPLITS-CA--------------1*    EXTENTS----------------1         
   REC-INSERTED--------1386*    FREESPACE-%CI----------0     SYSTEM-TIMESTAMP:                 
   REC-UPDATED---------1679*    FREESPACE-%CA----------0          X'D27517B1DBF7CD0A'         
   REC-RETRIEVED------59115*    FREESPC----------2686976*                                     
Quote:
2. Records Retrieved for Index Component - A file read on DATA internally uses index to retrieve the record. Would this not update the Records Retrieved for Index Component?
I suspect not in the way you think. Records in the index component are pointers to Data CI, and there may multiple levels of index (depending upon the VSAM data set). I've never looked at the records retrieved for the index component that closely, so I'm not sure if it updates once per data record or once per index CI retrieved.
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Robert Sample

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PostPosted: Wed May 03, 2017 12:21 am    Post subject: Reply to: VSAM Space Allocation
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Quote:
2. Records Retrieved for Index Component - A file read on DATA internally uses index to retrieve the record. Would this not update the Records Retrieved for Index Component?
I had a chance to test this. I created a 2-cylinder VSAM data set with 1000-byte records (1440 of them to be precise) and LISTCAT says I have an index with 3 levels. I then wrote a COBOL program to directly read 1000 records (from 441 to 1440) and then did a LISTCAT. The DATA component showed 1000 REC-RETRIEVED, as expected. The INDEX component showed 0 REC-RETRIEVED. I then changed the program to sequentially read 1000 records. Again, LISTCAT showed the expected 2000 REC-RETRIEVED for the DATA component (1000 direct reads and 1000 sequential reads) and the INDEX component showed 0 REC-RETRIEVED. I'll have to think about INDEX component REC-RETRIEVED and what it means some more.

But the answer to your question is now a definitive no, INDEX component REC-RETRIEVED is not related to the DATA component records retrieved.
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mrgnndhmk

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PostPosted: Wed May 03, 2017 12:50 am    Post subject:
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Thanks Robert.

Quote:

Edited:
My understanding is that INDEX is inserted, updated & deleted but never read. It is only the Data that is read and Index is always used internally



I also confirmed that "REC-RETRIEVED" is always 0 for the INDEX Component.

Did you notice that it is not true for REC-DELETED, REC-INSERTED, REC-UPDATED?

I LISTCAT on a file with Index - It shows asterix for the record count parameters which means it may not be true?

Code:

0   INDEX ------ PMT.METEST.INDEX
      IN-CAT --- UCAT.ORDER.PROD
      HISTORY
        DATASET-OWNER-----(NULL)     CREATION--------2014.279
        RELEASE----------------2     EXPIRATION------0000.000
      PROTECTION-PSWD-----(NULL)     RACF----------------(NO)
      ASSOCIATIONS
        CLUSTER--PMT.METEST.KSDS
      ATTRIBUTES
        KEYLEN----------------14     AVGLRECL---------------0     BUFSPACE---------------0     CISIZE--------------1024
1IDCAMS  SYSTEM SERVICES                                           TIME: 14:37:40        04/21/17     PAGE    950
0       RKP--------------------0     MAXLRECL------------1017     EXCPEXIT----------(NULL)     CI/CA-----------------33
        SHROPTNS(2,3)   RECOVERY     UNIQUE           NOERASE     NOWRITECHK     UNORDERED     NOREUSE
      STATISTICS  (* - VALUE MAY BE INCORRECT)
        REC-TOTAL------------117*    SPLITS-CI------------361*    EXCPS------------2528925*    INDEX:
        REC-DELETED----------403*    SPLITS-CA--------------1*    EXTENTS----------------4     LEVELS-----------------3
        REC-INSERTED---------290*    FREESPACE-%CI----------0     SYSTEM-TIMESTAMP:            ENTRIES/SECT----------10
        REC-UPDATED------1416594*    FREESPACE-%CA----------0          X'D26B7462804FAB42' SEQ-SET-RBA----------------0
        REC-RETRIEVED----------0*    FREESPC-----------131072*                             HI-LEVEL-RBA----------100352
      ALLOCATION
        SPACE-TYPE---------TRACK     HI-A-RBA----------135168
        SPACE-PRI--------------1     HI-U-RBA----------119808
        SPACE-SEC--------------1
[/quote]
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Robert Sample

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Joined: 06 Jun 2008
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Location: East Dubuque, Illinois, USA

PostPosted: Wed May 03, 2017 1:08 am    Post subject:
Reply with quote

I did a test with inserting some records into the VSAM KSDS and the REC-UPDATED for the INDEX component was non-zero after the inserts were done.
Quote:
It shows asterix for the record count parameters which means it may not be true?
I refer you to this line of the LISTCAT output:
Code:
      STATISTICS  (* - VALUE MAY BE INCORRECT)
I've told you the values you get in the LISTCAT may not be correct, LISTCAT tells you that the values you see may not be correct, and now you're asking again -- how many times are you going to ask for confirmation of what you are being told? When you see "VALUE MAY BE INCORRECT" you can believe what you are being told. The values may be correct but since there is an active update underway the values you see could change at any moment.
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