Stu Coates <stu@StuCoates.com> writes:
> I come from an Oracle background where I can lock an item of data by
> performing a "SELECT FOR UPDATE" on the row. This is also implemented
> in PostgreSQL. A quite useful feature Oracle does have is the ability
> to add a "NOWAIT" clause to the end of the command which will cause an
> exception if the item of data already has a lock taken out on it.
> AFAIK, this is not implemented in PostgreSQL. I did see a note that
> lock timeouts are not implemented, but if "NOWAIT" is added the
> application developer could implement/fudge timeouts him/herself. Would
> this be relatively easy to add?
It'd be possible, but not particularly easy; anything that involves
changing parse/plan trees is tedious. Moreover, I doubt that it'd be
especially useful given the lack of nested transactions in Postgres.
You'll have to make a lot better case than the above if you want to
get anyone excited about the idea.
regards, tom lane
