Problem with triggers - sequential incrementing

I have a table called student and I need to add the trigger for this table. This trigger needs to update increment_id for each line, each time that the new row is inserted or updated the existing line. If a new row inserted without specified increment_id that it should automatically assign the next value of sequence for this line.

First of all, I added new column to the table of students.
change the student table add (increment_id COMP (21.6);)

Then, a sequence is created for that table.

CREATE SEQUENCE seq_students
MINVALUE 1
MAXVALUE 999999999999999999999999999
START WITH 1
INCREMENT BY 1
CACHE 20;

Finally, I created the trigger as follows.

CREATE OR REPLACE TRIGGER trg_students_seqid
BEFORE the INSERT OR UPDATE ON students
FOR EACH LINE
BEGIN
insertion and: new.increment_id is null then
Select seq_students.nextval in: double new.increment_id;
elsif UPDATE then
Select seq_students.nextval in: double new.increment_id;
end if;
END;

Everything works fine and the increment_id is updated / inserted whenever I have add/edit new line. But the problem is sometimes when I change/add line and commit changes, I noticed that the assigned ID of increment is not continuous.

Example: Let say increment_id maximum current for this table is 50. If I update the row with student_id = 100 and commit the changes I found the increment_id so that the rank is 120 instead of 101. This happens sometimes when I insert a new line as well.

Can someone please help me with this and tell me where I have done wrong.

Thank you.

Sequences will be not free of gap.

When the sequence is aging out of the shared pool, for example, the cached values will be eliminated. Given that your cache is set to 20, which explains why the values will increase from 101 to 121 (101-120 were, no doubt, put in cache, and when the years sequence, the cached values have been cancelled). You can reduce the chances that you will get a deviation of the NOCACHE but sequence that will negatively affect performance. It won't completely prevent also the gaps - you'll see always gaps in transactions do backward when the triggers are redone for consistency of Scripture, etc.. If you can tolerate some gaps, you should be able to tolerate deviations resulting sequence cache aging on.

Justin

Tags: Database

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    You have the misfortune to have a model identifier 6.2 MBP that GPU problems. There was a program of replacement card logic on these models, but that has expired.

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      SQL in DB2 Top instructions are truncated in the delivered report of Top SQL

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      SQL in DB2 Top instructions are truncated in the delivered report of Top SQL

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