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Trigger insert sequence from defined set of values
Posted on 2011-03-08
I am not quite sure how to describe it but I have an application where end users submit accounts to be worked and they all go in a table. I am in need of assigning these accounts to a group of ten other users for example. These ten users have their own personal user id's.
Thus when the account is inserted into the table a trigger needs to insert a specific user id in the "Assigned" column and do so in a sequence to ensure an equal number of accounts per person. Just not sure how to design this.
Thanks in advance.
Thus when the account is inserted into the table a trigger needs to insert a specific user id in the "Assigned" column and do so in a sequence to ensure an equal number of accounts per person. Just not sure how to design this.
Thanks in advance.
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Round robin? So every 10th record is assigned to the same person?
Try the MOD operator against the sequence.
Not 100% accurate since sequences are not gapless but something like setting assigned to: Mod(sequence.nextval,10)
Try the MOD operator against the sequence.
Not 100% accurate since sequences are not gapless but something like setting assigned to: Mod(sequence.nextval,10)
Hi,
How do you need to manage concurrency and rollbacks ?
- what if the transaction that inserts do not commit ? The user assignation is rolled back and the user should available for another assignation.
- what if several concurrent inserts ? Each insert will not see the non-committed assignation, and finally when they all commit they will assign too much to a user.
Sequences (or random number) will be the most efficient, by result may not be balanced over users (gaps, rollbacks)
Keeping the number of assignation for each user in a table will solve that, but you will have concurrency issues (locks) when inserting.
Maybe you can change the design: instead of assigning at insert time, you should assign it when you query what the user has to work on: just pick the next 10 accounts from the queue (queue being the non-assigned accounts).
Regards,
Franck.
How do you need to manage concurrency and rollbacks ?
- what if the transaction that inserts do not commit ? The user assignation is rolled back and the user should available for another assignation.
- what if several concurrent inserts ? Each insert will not see the non-committed assignation, and finally when they all commit they will assign too much to a user.
Sequences (or random number) will be the most efficient, by result may not be balanced over users (gaps, rollbacks)
Keeping the number of assignation for each user in a table will solve that, but you will have concurrency issues (locks) when inserting.
Maybe you can change the design: instead of assigning at insert time, you should assign it when you query what the user has to work on: just pick the next 10 accounts from the queue (queue being the non-assigned accounts).
Regards,
Franck.
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