Are you planning to upgrade to Release 12.2 and Oracle Database 11gR2? Review document Database Prep
Take a look at Database Preparation Guidelines for an E-Business Suite Release 12.2 Upgrade (Doc ID 1349240.1)
This document details the database preparation process for Oracle E-Business Suite Release 11i and R12 (12.0, 12.1) customers planning to upgrade to Release 12.2 and Oracle Database 11gR2.