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#1: Header and Trailor Author: veeru_ch,

Posted: Sun Apr 22, 2007 2:46 pm
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Hi,
Can any one explain me what is use of header and trailor records in a file. This is an interview question.

Thanks in Advance
Veer

#2: Author: dbzTHEdinosauer, Location: germany

Posted: Sun Apr 22, 2007 3:19 pm
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A Header record would contain information that would differentiate this file from other files - date, etc - is made up of info known at the begining of he process that created the file. A header record is the the first record in the file.

A Trailer record would contain statistics about the file that were accumulated during the process that created the file- counts, amount totals , etc... A trailer record would be the last record in the file.

#3: Author: veeru_ch,

Posted: Mon Apr 23, 2007 3:49 am
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Dick, Thanks for the quick reply, Is there is any possibility of having more than one trailor for a file.

#4: Author: dbzTHEdinosauer, Location: germany

Posted: Mon Apr 23, 2007 4:19 am
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well, yeah. depends upon the original design. there maybe more data to pass with the trailer record than can fit in one record.

normally when a ds (dataset) has more than one record type, there is a common field, (often the first char) that defines the record type; for example:

1 - header record
2 - detail record
3 - trailer record

This can obviously become more complex and require two char for the definition

01 - header
02 - detail record type 1
03 - detail record type 2
04 - detail record type 3
12 trailer record with accumulated stats on detail record type 1
13 trailer record with accumulated stats on detail record type 2
14 trailer record with accumulated stats on detail record type 3
99 trailer record with accumulated stats on complete DS

Normally, a program that processes a DS which contains header/detail/trailer record, the individual trailer records are compare to accumulations to insure that number of records and totals in are equal to those output by the creating program.

#5: Author: vkphani,

Posted: Mon Apr 23, 2007 4:38 am
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veeru_ch wrote:

Is there is any possibility of having more than one trailor for a file.

Yes you can have.

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