Re: index cisz - does it change when cluster is EA/EF?

2007-12-21 Thread R.S. 

AFAIK,
EF means that to every PB (physical block) is added one cell.
Cell on 3390 is (AFAIR) 34 bytes.
It affect allocation of VSAM for the following CI sizes: 0.5 1.5 18 kB.
You just fall in the exception: DATA CISZ=18k.
Thats why you have less CI per CA when compared to non-EF.
Index parameters are adjusted to DATA parameters. In this case you will 
have less (data) CIs in CA, so index CI can be shorter.
There is always one index CI per data CA in sequence set (lower level 
index).



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index cisz - does it change when cluster is EA/EF?

2007-12-20 Thread Ambat Ravi Nair 
on z/OS 1.6

i created a KSDS with data cisz 18k (without explicitly coding index cisz).

data info with EA/EF:

ATTRIBUTES  
 

  KEYLEN24 AVGLRECL3400 BUFSPACE
---57344 CISIZE-18432
  RKP---15 MAXLRECL3400 EXCPEXIT--
(NULL) CI/CA-40
  STRIPE-COUNT---
1   



data info without EA/EF:

ATTRIBUTES  
 

  KEYLEN24 AVGLRECL3400 BUFSPACE
---57344 CISIZE-18432
  RKP---15 MAXLRECL3400 EXCPEXIT--
(NULL) CI/CA-45
  STRIPE-COUNT---1  



without EA/EF, the index info seen is:

ATTRIBUTES  
 

  KEYLEN24 AVGLRECL---0 BUFSPACE--
-0 CISIZE---1024
  RKP---15 MAXLRECL-1017 EXCPEXIT--
(NULL) CI/CA-33



with EA/EF, the index info is:

ATTRIBUTES  
 

  KEYLEN24 AVGLRECL---0 BUFSPACE--
-0 CISIZE---512
  RKP---15 MAXLRECL-505 EXCPEXIT--
(NULL) CI/CA-48



what causes this difference in the index cisz ?


- ravi.

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