The USER_DB_LINKS view provides information about all database links that are owned by the current user.

db_linkTEXTThe name of the database link.
typeCHARACTER VARYINGType of remote server. Value will be either REDWOOD or EDB.
usernameTEXTUser name of the user logging in.
passwordTEXTPassword used to authenticate on the remote server.
hostTEXTName or IP address of the remote server.