Opa.. para adicionar as 2 entradas..
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = IPDAMAQUINA)(PORT = 1521))
)
)
)
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /u01/app/oracle/product/10.2.0/db_1)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBNAME = BANCO1.COM.BR)
(ORACLE_HOME = /u01/app/oracle/product/10.2.0/db_1)
(SID_NAME = BANCO1)
)
(SID_DESC =
(GLOBAL_DBNAME = BANCO2.COM.BR)
(ORACLE_HOME = /u01/app/oracle/product/10.2.0/db_1)
(SID_NAME = BANCO2)
)
)
Bom.. espero que ajude..
E quando vc for conectar.. informe o SID_NAME da maneira que o DAVID te falou..