Answer / meghraj hulawale

Procedure Division.
1.Open vsam file as INPUT mode.
2. Copy the records of VSAM FILE into Table or Array by using occurs clause.
3.Count no. of records in VSAM FILE.
4.By using perform statement.
e.g
perform until I < vsam-cnt
read vsam file
perform until j < no-of-records in table or vsam-cnt
if vsam-data NOT =Table-record
A. Open another Output file as OUTPUT mode.
B. Write output file.
end-if.
increase the value of j as 1.
end-perform.
increase the value I as 1.
end-perform.
Stop run.

******Note
We need to access vsam as sequential.

Answer / ak

1.copy the file into array
2.read the file entil eof
3.if file-key equals to ws-arry-key(Count)
move ws-arry-key(count) to ws-dup-rec(for duplicate values)
else continue
write ws-arry-key

Answer / naveenkumar m

As few answered for VSAM file dedup, I will explain for PS flat files,

1) Make sure your file is sorted either Ascending or descending using SORT.

2)FIRST-READ PARA
READ INPUT-FILE INTO WS-ARRAY()
UNTIL EOF
ARRAY-COUNT=ARRAY-COUNT + 1

3)PERFORM COMPARE-PARA VARYING I FROM 1 BY 1 UNTIL I < ARRAY-COUNT
IF WS-ARRAY(I)=WS-ARRAY(I+1) THEN
WRITE DUPLICATE-RECORDS
ELSE
WRITE NODUPLICATE-RECORDS
END-PERFORM

=====================================
I just given algorithm not exact code....

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