Quelqu'un pourrait m'expliquer la différence entre :

mabase.world =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = XXXXXX)(PORT = 1638))
)
(CONNECT_DATA =
(SERVICE_NAME = mabase)
)
)

et

mabase.world =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = XXXXXX)(PORT = 1638))
)
(CONNECT_DATA =
(SID = mabase)
)
)

Merci d'avance