User`s guide

Upgrading a Database
4-10 Oracle Database Installation and Administration Guide
Re-compilation of C and COBOL Programmatic Interface Programs
All C and COBOL programs developed prior to release 11.2 must be precompiled
using the new version of the precompilers and recompiled.
Re-Linking Programmatic Interface Programs
All user-written precompiler or Oracle Call Interface applications must be re-linked
using the new Oracle Database libraries.
Rebuilding Oracle Database (openUTM) Applications
openUTM applications must be rebuilt. Refer to the chapters on openUTM in this
manual and in Oracle Database User's Guide for Fujitsu BS2000/OSD for more
information.
Updating ORAENV Files
Your ORAUID environment variable must reference the correct Oracle Database
installation user ID. Check your
ORAENV files, and if necessary, amend the values of the
ORAUID and NLS_LANG environment variables.