The base 11.2.0.4 still contains hundreds of known bugs fixed only in subsequent or Bundle Patches (up to 2019 for some platforms). For a truly “fixed” system, after downloading 11.2.0.4, you should apply:
Allowed multiple instances to access a single database concurrently, delivering extreme high availability and horizontal scalability. 💾 2. Software Availability and Download Facts oracle database 11g release 2 112 04 download fixed
Despite being the "fixed" terminal release, 11.2.0.4 is not without its own specific quirks. Administrators deploying this version today must be aware of: Oracle Database 11g Release 2 (11