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what is the difference between the PS and ESDS

 
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link.pradeep

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PostPosted: Fri Feb 23, 2007 6:42 pm    Post subject: what is the difference between the PS and ESDS
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what is the difference between the PS and ESDS
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dick scherrer

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PostPosted: Mon Feb 26, 2007 7:02 am    Post subject:
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Hello,

PS (Physical Sequential) is a QSAM file.

ESDS (Entry Sequence Data Set) is a VSAM file.

Is this what you are looking for? If not please clarify.
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imran_ap

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PostPosted: Sat Mar 03, 2007 1:58 am    Post subject:
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Dick is right
P.S. Files are Flat files where as ESDS are created with Index which can be accessed by RBA(relative Byte address)

if someone wants to add more
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priyesh.agrawal

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PostPosted: Sat Mar 03, 2007 11:14 am    Post subject: Re: what is the difference between the PS and ESDS
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Quote:
what is the difference between the PS and ESDS

> ESDS are Indexed files, whereas PS (Physical Sequential) are not.
> Can't delete records from ESDS but in PS.
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dick scherrer

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PostPosted: Sun Mar 04, 2007 5:41 am    Post subject:
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Hello,

I believe this
Quote:
Can't delete records from ESDS but in PS.
needs some clarification. icon_confused.gif
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priyesh.agrawal

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PostPosted: Sun Mar 04, 2007 11:46 am    Post subject: Re: what is the difference between the PS and ESDS
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dick scherrer wrote:
I believe this Quote:
priyesh wrote:
Can't delete records from ESDS but in PS.

needs some clarification.

Hi Dick... I meant a Physical Deletion of the records in ESDS.
Anyway it is always possible to just copy the records you want in a new file with same attribute.
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sachin_star3
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PostPosted: Sun Mar 04, 2007 1:09 pm    Post subject:
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PS AND ESDS both are sequential files
but eds have the alternate index and ps have no alternate index
ps file is use for backup purpose it residing on tape
and esds file vsam file it residing on disk,
In esds there is control field for storing information of free space and about LRECL of same record i.e.CIDF AND RDF
There is no control information in PS file
In ESDS the term CI means control interval comes :the CI same like BLOKE SIZE that use for transfer the i/o information
In ps there is no blocksize

from-sachin
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