> And, of course, most development environments (perl, php, java etc)
> have their own language specific connection pooling solutions.
Yes, the one for php is what I was thinking of when I made my statement.
They work on a per backend basis as Apache does not allow for the type
of communication between processes that would otherwise be required. A
connection created by Apache backend A cannot be used by Apache backend
B.
Java is an example where it is done well, but the language decision was
made long before I joined the firm.
I cannot tell if mod_pg_pool works across Apache forked backends or is
still bound to a single process. They state it is intended for sharing
connections across modules, so it is probably still backend specific.