I wrote:
>
> I just spent 15 minutes searching on the RH web site trying to locate
> a complete list of packages in the various RHEL personalities, with
> conspicuous lack of success. How anyone can make decisions about it
> without knowing exactly what is in it is beyond me.
However, you can see a list of its SRPMs here:
http://distro.ibiblio.org/pub/Linux/distributions/redhat/enterprise/3/en/os/i386/SRPMS/
and presumably on other mirrors.
it includes rh-postgresql-7.3.4-8.src.rpm (14.9Mb) and
mysql-3.23.58-1.src.rpm (11.5 Mb)
cheers
andrew