HP A.06.11 - Manual (Page 219)

2. Verify that the TNS listener is correctly configured for the Oracle Target Database.
This is required for properly establishing network connections:
Export ORACLE_HOME as described in Step 1 on page 218 and start the listener
from the ORACLE_HOME directory:
bin/lsnrctl start service
exit
If it fails, startup the TNS listener process and refer to the Oracle documentation
for instructions on how to create TNS configuration file (LISTENER.ORA).
Export ORACLE_HOME as described in Step 1 on page 218 and start the SQL
Plus from the ORACLE_HOME directory:
bin\sqlplus
At the SQL prompt, type:
connect Target_Database_Login
exit
If it fails, refer to the Oracle documentation for instructions on how to create a
TNS configuration file (TNSNAMES.ORA).
Integration guide for Oracle and SAP 219