Separating the database server from the app server is a classical thing to
do, and the decision to do so is usually based on the expected load on the
servers. In my experience, the license fee for the database software (which, in
the case of at least one well-known database software vendor, can be higher
than the hardware cost) seems to be among the primary drivers of this
decision. If the DB license is very expensive and is based on CPU count or some
similar metric, you don't want to oversize that server (so it can also run the
apps) and wind up spending more on the DB license than you need to. On the
other
hand, there's nothing wrong with keeping everything on one server, if it has
enough total capacity; Solaris is very good at managing lots of dissimilar
programs running simultaneously.
Regards
gear
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