ORA-16191: Primary log shipping client not logged on standby Cause: An attempt to shipredo to standby without logging on to standby or with
invalid user credentials. Action: Check that primaryand standby are using password files and that both
primary and standby have the same SYS password. Restart primary and/or
standby after ensuring that password file is accessible and REMOTE_LOGIN_
PASSWORDFILE initialization parameter is set to SHARED or EXCLUSIVE.