I searched all the forum but I didn't find any clue about it. I have a staging table that multiple threads consume. To avoid deadlock, I'm using something like this:
SELECT ID_MESSAGE
FROM TB_STAGE_IN S
WHERE S.CD_STATUS = 0
AND S.ID_JOB_SCHEDULE IS NULL
AND ROWNUM <= 10000
FOR UPDATE SKIP LOCKED;
It works fine, but the threads don't reach the max of 10,000 rows. It's like:
I know that happens because the rownumber for them is the same, but the table has thousands and thousands of rows. What I really need is the thread gets 10,000 rows unlocked on every step.
I tried using FETCH FIRST 10000 ROWS ONLY, but I receive the message below: ORA-02014: cannot select FOR UPDATE from view with DISTINCT, GROUP BY, etc.
Could you all please help me?
Thanks for the kind.
Ask Tom has a suggestion that goes like this
open C; -- cursor C is select ... for update skip locked;
loop
fetch C bulk collect into :my_array limit 100;
append :my_array to :to_be_processed_array;
exit when c%notfound or :to_be_processed_array.count >= 10000;
end loop;
-- process any rows in :to_be_processed_array
close C;
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