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How to delete a record from a ESDS file?

 
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reachcyrus

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Joined: 13 Jul 2007
Posts: 24
Location: chennai

PostPosted: Thu Jul 19, 2007 10:28 am    Post subject: How to delete a record from a ESDS file?
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i tried opening a ESDS file and deleted a record.Mvs responded with a error message as "operation cannot be done".

How to delete a record in ESDS file manually?

Why we are not able to delete record from a ESDS file?
could someone help me!

Cheers!
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expat

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Joined: 14 Mar 2007
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Location: Back in jolly old England

PostPosted: Thu Jul 19, 2007 12:37 pm    Post subject:
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How do you mean manually ? FileAid ? A program ?

When you delete an ESDS record, it is only a logical delete and the record will only be physically deleted when you next unload / reload the file.
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reachcyrus

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PostPosted: Thu Jul 19, 2007 1:50 pm    Post subject:
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Hi expat,

using File aid.

i am not clear about your explanation. can you brief me.

cheers!!
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William Thompson

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PostPosted: Thu Jul 19, 2007 2:23 pm    Post subject:
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Cyrus,

Do you know what a tape file is?
Can you delete a record from a tape file without copying it to another file?
ESDS files are like that......
The only thing you can do "in place" is to mark the record so that when any other program reads that record, it will know that the record is "deleted".
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reachcyrus

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PostPosted: Thu Jul 19, 2007 2:42 pm    Post subject:
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Hi william.

i got it.
but i need the reason, why it cannot be deleted physically.
any special reasons?
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William Thompson

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PostPosted: Thu Jul 19, 2007 2:48 pm    Post subject:
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reachcyrus wrote:

but i need the reason, why it cannot be deleted physically.
any special reasons?
Because there is no facility or process to remove the hole left when you would delete an ESDS record.
If the hole (the record's data replaced with low values?) was left in place, then all the other programs that read that file would have to know that the low value record was a deleted record - that it was "logically deleted".....
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