when we are tying to update a table having 100 rows. if the program abends whe

when we are tying to update a table having 100 rows. if the
program abends when updating 51 row . how to start updating
again from the 51 row .what was the logic

Question Posted / pratap

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when we are tying to update a table having 100 rows. if the program abends when updating 51 row . ..

Answer / abhijit18in2002

when we are tying to update a table having 100 rows.
if the program abends when updating 51 row . how to start
updating again from the 51 row .
what was the logic

Ans: The Possible answer would be..if you had used COMMIT
before 51st ROW .. the Former records
would have been updated in the table .. If No COMMIt was
used.. The whole transaction would have been
ROLLBACKED.

Now If you want to start a fresh Transaction and want to
start Updating directly from 51st Row
Then There are two ways

1> Perform a loop to scroll till u have read 50 rows
Then Point ur cursor as CURRENT to the 51st Row
Start Updating the Records Till end of table.

or

2> Declare a Scrollable cursor & use FETCH ABSOLUTE option
to fetch a particular row directly

EXEC SQL FETCH ABSOLUTE +51 C1
INTO :TEMP1, :TEMP2, :TEMP3;

this statement fetches the 51st row of the Table

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when we are tying to update a table having 100 rows. if the program abends when updating 51 row . ..

Answer / kamra2010

1) Create two work files, say WORK-1 and WORK-2.
2) Unload the table into file WORK-1.
3) Pass the commit frequency through the JCL to the program.
4) Program logic:
(i) read the input file WORK-1
(ii) update the table
(iii) if the number of records updated in the table is
equal to the commit frequency then apply COMMIT command.
Also, write the last committed record into the output file
WORK-2. (this record will be used for restart logic)

(iv) In Restart process,
a. read the output file record
b. next, the input file will be read untill it
finds the corresponding output file record
c. follow the same step 4(i) to step 4(iii)

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