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Dump a Data File and Reload
It
More important as a backup procedure, you can
dump your data files onto cards or paper tape.
In
case anything happens to the disk cartridge, the data
file may be reloaded.
To dump a data file, you must know its size in
sectors.
The sequence of cards
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will dump the 65-sector data file, FILEX, from the
UA to cards (CD).
The data file is punched into the blank card deck,
54 words per card.
No header or trailer cards are
punched.
To reload, you must know the number of cards
in the dumped deck.
To continue the previous example of a 65-sector
file (20,800 words), the dumped deck would have
required about 386 cards.
To reload, then, you need the cards
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Section
Subsections
Page
60
30
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20
Copy a Data File onto Another Area on the Same
Disk
04
Another method of data file backup is to copy the
file onto another portion of the disk.
Typically this
would be done before running a job that modifies the
file.
If
the file is 100 sectors long and called MEN,
the job
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will move it to Working Storage, then include it in
the User Area with a different name (TMEN).
If
the program you wish to run operates satis-
factorily, updating the file MEN, you need do nothing
except DELETE TMEN.
If
on the other hand, some error occurs that ruins
the file MEN, you have a duplicate file (TMEN)
ready to replace it. The steps shown below will
replace MEN, which has been ruined, with TMEN:
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Now you may rerun the job.
Be especially care-
ful not to *DELETE TMEN until you are sure
everything went according to plan.
This protects you from accidental programmed
loss of a data file; however, it does not protect
against physical loss or destruction of the disk
cartridge itself.
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