How to create pl/sql that run efficiently in background ?

Hi sql gurus,
We have application on Oracle 10g where 150+users (from multiple branch) concurrently input transaction. The transaction number is centralized, means all user use same transaction number counter.
To avoid the contention that occured, we think of using pl/sql procedure that run in background to do :
- select transaction that not yet has number
- query the last transaction number counter(a column in a table), increment by 1, update the transaction with the number
- commit
- process another transaction
What is the best approach to do this ?
(means a pl/sql that does not cause high CPU utilization, because it will run all day long)
Thank you,
xtanto

Hi,
Why can't you give them a number upon creationCurrently we doit this way, and this cause contention. thats why we think of separate the numbering process.
Fyi we donot use Sequence ( for gapless numbering).
We maintain the number counter in a column in a separate table. It is the update to this table that cause contention.
Oracle sequences are typically used for meaningless number generation. Yes, We dont use sequence.
Thank you
xtanto

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