On 11/24/13 19:15, Simon Riggs wrote:
On 18 November 2013 07:36, Heikki Linnakangas <hlinnakan...@vmware.com> wrote:
On 14.11.2013 22:10, Simon Riggs wrote:
Includes test extension which allows sequences without gaps - "gapless".
I realize this is just for demonstration purposes, but it's worth noting
that it doesn't actually guarantee that when you use the sequence to
populate a column in the table, the column would not have gaps. Sequences
are not transactional, so rollbacks will still produce gaps. The
documentation is misleading on that point. Without a strong guarantee, it's
a pretty useless extension.
True.
If I fix that problem, I should change the name to "lockup" sequences,
since only one transaction at a time could use the nextval.
Should I change the documentation, or just bin the idea?
Just bin it. It would be useful if it could guarantee gaplessness, but I
don't see how to do that.
- Heikki
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