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how the cobol program look like when we r using ksds?

 
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babun

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Joined: 03 Aug 2005
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Location: bangalore

PostPosted: Wed Aug 03, 2005 12:41 pm    Post subject: how the cobol program look like when we r using ksds?
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how the cobol program look alike when we r using Vsam ksds? what r all the necessary action on cobol pgm?
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babun

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PostPosted: Wed Aug 03, 2005 12:44 pm    Post subject: can we use SELECT * FROM ------; query in Embedded SQL?
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can we use SELECT * FROM ------; query in Embedded SQL? if we can why ? if we can't why?
pls let me know folks?
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thanooz

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Joined: 28 Jun 2005
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PostPosted: Wed Aug 03, 2005 3:13 pm    Post subject:
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hi
babum

when you are using ksds

the main consideration on

file control

select filename assign to jcldd
organiztion is indexed
access mode sequential/random/dynamic
record key is file-key-field
alternate key is file-alternate-key field.


if it is sequential access no bother of record key and alternate key.

thanks,
thanooz.
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thanooz

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PostPosted: Wed Aug 03, 2005 3:24 pm    Post subject:
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hi babu

we cont in embeded sql. because it gives error.
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Ravi Gopal

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Joined: 04 Aug 2005
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PostPosted: Thu Aug 04, 2005 12:04 pm    Post subject: can we use SELECT * FROM ------; query in Embedded SQL?
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Hi Babun,

The reason for not using SELECT * FROM query in the program is:

1.If the table structure is changed (a field is added), the program will have to be modified.

2.Program might retrieve the columns which it might not use, leading on I/O over head.


Cheers
Ravi
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babun

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PostPosted: Thu Aug 04, 2005 12:32 pm    Post subject: Hi
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Thanks ravi
thank you for your answer..
it's clear
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thanooz

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PostPosted: Thu Aug 04, 2005 8:56 pm    Post subject:
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hi babu

For three reasons:
If the table structure is changed (a field is added), the program will have to be modified
Program might retrieve the columns which it might not use, leading on I/O over head.
The chance of an index only scan is lost.

thanks,
thanooz.
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