1. Installation Guide
  2. Installing and Patching Oracle Applications and Oracle Database
  3. Perform Oracle Database 19c Post-Upgrade Tasks
  4. Unset optimizer_features_enable

Unset optimizer_features_enable

To unset optimizer_features_enable:
  1. Log in to Oracle Database 19c.
  2. Unset optimizer_features_enable.
  3. Restart the database.

Parent topic: Perform Oracle Database 19c Post-Upgrade Tasks