Users initiate a connect request by passing a user name and password along with an connect identifier for the service to which they wish to connect. The connect identifier, which is mapped to a connect descriptor, is resolved by a naming method for the client. The connect descriptor contains the:
Network route to the service, including the location of the listener through a protocol address
Service name of an Oracle9i or Oracle8i database or Oracle System Identifier (SID) of an Oracle8 or Oracle7 database
Once the connect identifier is resolved, the uses the network route information in the connect descriptor to contact a listener. The listener, through a protocol, accepts the client connection. It compares the client information with the information it has received from the database service, as well as information it has stored in its own configuration file, listener.ora. If the information matches, a connection is granted.
Naming method configuration consists of creating connect descriptors for services and configuring clients to access the naming method.
You can use Oracle Net Configuration Assistant to specify usage of the following naming methods in the sqlnet.ora file:
Stores net service names in a tnsnames.ora file stored on a client | |
Stores services and net service names in a centralized LDAP-compliant directory server | |
Stores services and net service names in an Oracle Names server | |
Enables users to connect to an Oracle database server by using a host name alias. Host names are mapped to a connect descriptor in an existing names resolution service, such as Domain Name System (DNS), Network Information Service (NIS), or a centrally-maintained set of /etc/hosts files. | |
Stores service information in an a third-party naming service, including NIS or Cell Directory Service (CDS) |
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See Also: Specify Naming Methods |
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See Also: Chapter 9, Configuring Naming Methods, in the Oracle Net Services Administrator's Guide |