Thank you for your comments. Sorry for the late reply.

From: Kirk Wolak  Sent: Friday, November 25, 2022 6:12 PM
> My first question is why are you not using "WHERE CURRENT OF" cursor_name?

I thought that cursors are preferred for manipulating large numbers of rows. 
So I did not consider using cursors in this test case because each process 
manipulates only one row.

However, assuming general usage, I thought it would be preferable to use a 
cursor, as you pointed out, because it might result in fewer table accesses.
I didn't have that knowledge.


> But effectively, you are locking the row and that is the row you want to 
> update (the current row of the cursor).
> I wonder if that addresses the problem...

I tested it with a cursor, but there was still a problem..
I will attach the script used for the test, though it will be simple.

<<attachment: testset2.zip>>

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