Before start to create standby database by using DUPLICATE command, try to connect to auxiliary instance:
RMAN> connect auxiliary sys/password@testdbsty RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-04006: error from auxiliary database: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
$ sqlplus sys/password@testdbsty as sysdba SQL*Plus: Release 126.96.36.199.0 Production on Tue Jan 15 15:18:35 2019 Copyright (c) 1982, 2013, Oracle. All rights reserved. ERROR: ORA-12154: TNS:could not resolve the connect identifier specified
Add an entry in listener.ora, and then reload listener to make it effective:
SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = TESTDBSTY) (SID_NAME = TESTDBSTY) (ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1) ) .. . } $lsnrctl status Services Summary... Service "TESTDBSTY" has 2 instance(s). Instance "TESTDBSTY", status UNKNOWN, has 1 handler(s) for this service... Instance "TESTDBSTY", status BLOCKED, has 1 handler(s) for this service... ... . .