Skip this section if you will run only Oracle.
OpenACS 5.9.0 will run with PostgreSQL 9.0 or newer. 9.5 is currently the recommended version of PostgreSQL.
It is recommend to use a prepackaged version of PostgreSQL, which are available in source and binary formats from www.postgresql.org/download/.
Larger installations might want to tune the PostgreSQL
installation with e.g. the utility pgtune,
which is also available via
install pgtune or
dnf install pgtune on
Debian/Ubuntu or RedHat systems.