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Explain about Internal Sort
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SORT work-file ON ASCENDING KEY rec-key1
[ON DESCENDING KEY rec-key2]
USING input-file GIVING output-file.
Input file - is the file which we have to sort either in ascending or descending order.
Work file - is used to hold records while the sort process is in progress.
Input file records are transferred to the work file for the sorting process.
This file should be defined in the File-Section under SD entry.
Output file - is the file which we get after the sorting process.
It is the final output of the Sort verb.
SORT performs the following operations -
1. Opens work-file in I-O mode, input-file in the INPUT mode and output-file in the OUTPUT mode.
2. Transfers the records present in the input-file to the work-file.
3. Sorts the SORT-FILE in ascending/descending sequence by rec-key.
4. Transfers the sorted records from the work-file to the output-file.
5. Closes the input-file and the output-file and deletes the work-file.
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