LISTENER: Service/SID Aliases

Question

Hi,
I have this db instance that answer correctly to DEVDB from a service DEVDB
Now, I would like to have it accept connection to TESTDB as well.
I know it is possible to use some sort of aliases but not sure how to setup the .ora files
here are the files;
# listener.ora Network Configuration File: /usr/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /usr/app/oracle/product/10.2.0/db_1)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = DEVDB.DEV)
(ORACLE_HOME = /usr/app/oracle/product/10.2.0/db_1)
(SID_NAME = DEVDB)
(SID_DESC =
(GLOBAL_DBNAME = DEVDB.DEV)
(ORACLE_HOME = /usr/app/oracle/product/10.2.0/db_1)
(SID_NAME = TESTDB)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
~
# sqlnet.ora Network Configuration File: /usr/app/oracle/product/10.2.0/db_1/network/admin/sqlnet.ora
# Generated by Oracle configuration tools.
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
NAMES.DEFAULT_DOMAIN = DEV
~
# tnsnames.ora Network Configuration File: /usr/app/oracle/product/10.2.0/db_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
#DEV =
# (DESCRIPTION =
# (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
# (CONNECT_DATA =
# (SERVER = DEDICATED)
# (SERVICE_NAME = dev)
DEVDB.DEV =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = DEVDB)
DEVDB.DEV =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = TESTDB)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
~

Answer 1

each name must be in single quotes and the list is separated by commas.Not necessarily :
SQL> sho parameter service
NAME                                 TYPE        VALUE
service_names                        string
SQL> alter system set service_names='devdb, testdb';
System altered.
SQL> sho parameter service
NAME                                 TYPE        VALUE
service_names                        string      devdb, testdb
SQL> alter system set service_names='devdb','testdb';
System altered.
SQL> sho parameter service
NAME                                 TYPE        VALUE
service_names                        string      devdb, testdb
SQL>
How can I make this alias work so I can connect to the short name;
testdb and it will connectd by default to the dev domain but if I specify testdb.prod it will go the the production database??Not sure to understand... you'd want to simultaneously use two different domains for the same database ?