Connexion toad oracle

Je viens de rechercher le fichier TNSNAMES.ORA qui se trouve dans
D:\oracle\product\10.2.0\db_3\NETWORK\ADMIN\SAMPLE
VOICI soncontenu :

# This file contains the syntax information for
# the entries to be put in any tnsnames.ora file
# The entries in this file are need based.
# There are no defaults for entries in this file
# that Sqlnet/Net3 use that need to be overridden
#
# Typically you could have two tnsnames.ora files
# in the system, one that is set for the entire system
# and is called the system tnsnames.ora file, and a
# second file that is used by each user locally so that
# he can override the definitions dictated by the system
# tnsnames.ora file.

# The entries in tnsnames.ora are an alternative to using
# the names server with the onames adapter.
# They are a collection of aliases for the addresses that
# the listener(s) is(are) listening for a database or
# several databases.

# The following is the general syntax for any entry in
# a tnsnames.ora file. There could be several such entries
# tailored to the user's needs.

<alias>= [ (DESCRIPTION_LIST = # Optional depending on whether u have
# one or more descriptions
# If there is just one description, unnecessary ]
(DESCRIPTION=
[ (SDU=2048) ] # Optional, defaults to 2048
# Can take values between 512 and 32K
[ (ADDRESS_LIST= # Optional depending on whether u have
# one or more addresses
# If there is just one address, unnecessary ]
(ADDRESS=
[ (COMMUNITY=<community_name>) ]
(PROTOCOL=tcp)
(HOST=<hostname>)
(PORT=<portnumber (1521 is a standard port used)>)
)
[ (ADDRESS=
(PROTOCOL=ipc)
(KEY=<ipckey (PNPKEY is a standard key used)>)
)
]
[ (ADDRESS=
[ (COMMUNITY=<community_name>) ]
(PROTOCOL=decnet)
(NODE=<nodename>)
(OBJECT=<objectname>)
)
]
... # More addresses
[ ) ] # Optional depending on whether ADDRESS_LIST is used or not
[ (CONNECT_DATA=
(SID=<oracle_sid>)
[ (GLOBAL_NAME=<global_database_name>) ]
)
]
[ (SOURCE_ROUTE=yes) ]
)
(DESCRIPTION=
[ (SDU=2048) ] # Optional, defaults to 2048
# Can take values between 512 and 32K
[ (ADDRESS_LIST= ] # Optional depending on whether u have more
# than one address or not
# If there is just one address, unnecessary
(ADDRESS
[ (COMMUNITY=<community_name>) ]
(PROTOCOL=tcp)
(HOST=<hostname>)
(PORT=<portnumber (1521 is a standard port used)>)
)
[ (ADDRESS=
(PROTOCOL=ipc)
(KEY=<ipckey (PNPKEY is a standard key used)>)
)
]
... # More addresses
[ ) ] # Optional depending on whether ADDRESS_LIST
# is being used
[ (CONNECT_DATA=
(SID=<oracle_sid>)
[ (GLOBAL_NAME=<global_database_name>) ]
)
]
[ (SOURCE_ROUTE=yes) ]
)
[ (CONNECT_DATA=
(SID=<oracle_sid>)
[ (GLOBAL_NAME=<global_database_name>) ]
)
]
... # More descriptions
[ ) ] # Optional depending on whether DESCRIPTION_LIST is used or not