Oracle recommends that you complete these tasks after installation.

• Creating a Backup of the root.sh Script
  Oracle recommends that you back up the root.sh script after you complete an installation.
• Setting Language and Locale Preferences for Client Connections
  Configure client applications connecting to an Oracle Database according to your locale preferences and your I/O device character set.
• Recompiling All Invalid Objects
  Oracle recommends that you run the utlrp.sql script after you install, patch, or upgrade a database, to identify and recompile invalid objects.
• Updating the Oracle ORAchk Health Check Tool
  Update the existing version of your Oracle ORAchk utility to perform proactive heath checks for the Oracle software stack.