CONNECT TO THE DATABASE WITH DATABASE CONTROL; YOU WILL SEE THE PROBLEM REPORTED ON THE DATABASE HOME PAGE, IN THE ALERTS SECTION

8. - OCA OCP ORACLE DATABASE 11G A LL IN ONE EXAM GUIDE P90 POT
OCA OCP ORACLE DATABASE 11G A LL IN ONE EXAM GUIDE P90 POT

8. Connect to the database with Database Control; you will see the problem

reported on the database home page, in the Alerts section.