Summary
Checking the connection with dbspicao -dpv shows a failed status.
Error
Running /var/opt/OV/bin/instrumentation/dbspicao -dpv when logged in the server as root user fails:
Checking instance: 'db' @ '/u01/app/oracle/product/18.0.0/dbhome_1':
Connect: FAILED
Policies were deployed but no metric collected.
All MP tools fails when executing them as root user.
It works when log in as Oracle user.
Cause
Wrong permissions on $ORACLE_HOME/bin/oracle file:
# ls -al oracle
-rwxr-xr-x. 1 oracle oinstall 436988344 Jan 8 2020 oracle
Fix
Provide the correct permissions to $ORACLE_HOME/bin/oracle file:
# chmod 6755 oracle
# ls -al oracle
-rwsr-sr-x. 1 oracle oinstall 436988344 Jan 8 2020 oracle