RS,

Just remembered a VSAM  "gottcha". After initial load yit is better to 
ALTER the dataset to use FSPC(0 0) if you are using Sequential Insert 
Strategy so as to reduce the potential for CA splits.

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"R.S." <[EMAIL PROTECTED]> 
Sent by: IBM Mainframe Discussion List <[email protected]>
03/12/2007 15:16
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Re: KSDS CA split, no CI split






Larry Crilley wrote:
> I've seen when an INDEX CI gets full (can not put any more compressed 
keys
> into the INDEX), a CA SPLIT can occur.  Since the sequence set can not 
hold
> the new key, the CA must be split.
> 
> Try loading your dataset and run an IDCAMS EXAMINE.  EXAMINE has been
> updated in the past few years to give you a recommended INDEX CI size. 
It
> will also tell you if you have any 'unreachable' data CI's.

I ran EXAMINE INDEXTEST DATATEST. No clue about unreachable CIs. The key 
should be well compressed - the values are: 00000001, 00000011, 00000021, 
etc. I also tried to increase CI size. Started from default 1.5k, ended at 
18k. Still having the same number of CA splits. What's funny the higher CA 
free space the more CA splits.


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Radoslaw Skorupka
Lodz, Poland


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