Design of gap-free invoice number or check number

Hi, i have this "old question" that i can't seems to find the answer that satisfy the following requirment
- An audit requirement to have a gap free in the invoice number/check number
- this is a high concurrent oltp in generating invoices/checks
- the design should be able to scale well without serialization issue
- the design should be working well in RAC environment.
Since sequence will not guarantee gap-free, or nocache suffer will have issue in RAC, thus i wondering what design approach i should use.
A note i saw was saying using a seq for the primary key and subsequent using a batch process to generate a gap-free number.
rgds
Ung
Edited by: Kok Aik on Jan 7, 2009 10:17 PM

Kok Aik wrote:
Hi, i have this "old question" that i can't seems to find the answer that satisfy the following requirment
- An audit requirement to have a gap free in the invoice number/check number
- this is a high concurrent oltp in generating invoices/checks
- the design should be able to scale well without serialization issue
- the design should be working well in RAC environment.
If you absolutely have to have something like, then it's going to have a serialising effect - although you can take steps to do damage limitations. I discussed one strategy in Practical Oracle 8i many years ago, which pointed out that basically you have to do your audit by looking at numbers which have been used, but also have a permanent record of numbers that have not been used.
There are several ways to do this, but here's an outline of one:
Populate a table with "the next 1000 available values".
A process that needs an Id updates and commits on the lowest available number.
Once a number has been marked as allocated, the process creates an invoice, which includes a step either to mark the id as used, or to delete it. (I prefer the latter, as this means on commit the value disappears from the source table and reappears as a value in the invoice table).
You end up with three possible states for an id:
Available
Allocated but not used
Used
The audit has to check that the union of all three lists contains no gaps.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"Science is more than a body of knowledge; it is a way of thinking" Carl Sagan

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