COMMENTS IN TNSNAMES.ORA

Be careful when commenting tnsnames.ora file:

Both DB1 and DB2 does not work:

DB1 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = host1)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = DB1)
)
)

#DB2 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = host2)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = DB2)
)
)

This works:

DB1 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = host1)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = DB1)
)
)

#DB2 =
#(DESCRIPTION =
#(ADDRESS_LIST =
#(ADDRESS = (PROTOCOL = TCP)(HOST = host2)(PORT = 1521))
#)
#(CONNECT_DATA =
#(SERVICE_NAME = DB2)
#)
#)