Many legacy applications—particularly those built by Independent Software Vendors (ISVs)—were certified only for Oracle 11g. Upgrading to 12c or 19c requires recertification, which can be prohibitively expensive for legacy systems. Consequently, these systems remain "stuck" on 11.2.0.4.
Thousands of bugs identified in 11.2.0.1-11.2.0.3 are resolved in 11.2.0.4. oracle database 11g release 2 112 04 download fixed
