Setup and Upgrade tools should add the minimum required JVM options.

Setup should apply best effort minimum settings to the JVM during setup and upgrade.

Adding the minimum settings during setup or upgrade will:

• Ensure proper young gen to old gen cache object collection of db-cache; MaxTenuringThreshold.
• Ensure proper GC behavior; CMS.
• Eliminate or curb Full GC's; CMS.
• Ensure the best case initial performance after install.
• Ensure the best case initial performance after an upgrade, if the original instance was never tuned.
• Reduce or eliminate support cases due to untuned JVM's.
• Reduce downtime caused by restarts to tune the JVM or to enable GC logging.

Minimum settings

1. -Xmn
2. -Xms, -Xmx
3. -XX:+UseConcMarkSweepGC (or -XX:+UseG1GC)
4. -XX:MaxTenuringThreshold=1
5. -XX:CMSInitiatingOccupancyFraction=60 (or 70)
6. -XX:+DisableExplicitGC (when JMX is configured)
7. -XX:+PrintGCDetails, -XX:+PrintGCTimeStamps, -Xlog:gc*