Now that Oracle Enterprise Manager Cloud Control 12c Release 3 (aka EM12cR3!) has been out for a few weeks, I decided to brave it and upgrade our Production stack today. In this post, I’ll be upgrading an EM12cR2 (18.104.22.168) installation which consists of two OMSes, running on Linux x86-64 (RHEL5) which uses an 22.214.171.124 database management repository.
A standard Oracle 126.96.36.199 database installation comes bundled with Application Express (APEX) 3.2.1 by default. I’m going to upgrade to the latest version of APEX (currently 4.2.2) and then configure the Embedded PL/SQL Gateway (EPG), which uses the Oracle XML DB HTTP components within the database itself, so I don’t need to run a separate HTTP server. First