Follow the link for upgrade.
Removing Unnecessary Workloads / Overheads
- Disable any custom triggers and business events 12 Best Practices for Minimizing E-Business Suite R12.2.n Upgrade Downtime
- Disable all DBMS scheduler (DBMS_SCHEDULER), DBMS Job (DBMS_JOB) and Autotask (DBMS_AUTO_TASK_ADMIN) activities during the upgrade
- Review and disable custom VPD policies as needed
- Disable auditing if enabled.
- Review and disable all debug or logging; do this at all levels (site, responsibility, user level etc.).
- If possible run in noarchivelog mode.
- Disable flashback DB.
- Remove TDE (Transparent Data Encryption) from high volume tables.
- Consider running AutoConfig in parallel on a multi-node system.
- Split any RDBMS Upgrade, Platform Upgrade, Conversion to OATM into a separate downtime period.
- Use TUMS (The Upgrade Manual Script) to avoid running tasks that are not relevant to the installation
- Minimize Historical Data To Be Upgraded (Upgrade by Request) (Upgrade from 11i Only)
- Parallelize pre and post upgrade technical activities Define separate concurrent manager queue for post upgrade jobs.
- If using RAC then “Parallel Concurrent Processing (PCP)” could be used for post-upgrade concurrent jobs.
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