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Since Oracle Database 10g, youcan export directory entries to create
a local TNSNAMES.ORA file; this file may be used for clients not using the
directory or if the directory is unavailable.
Host naming
Clients can simply use the name of the host on which the instance runs. This is
valid for TCP/IP networks with a mechanism in place for resolving the hostname
into an IP address. For example, the Domain Name Service (DNS) translates a
hostname into an IP address, much as Oracle Names translates service names.
Since Oracle Database 10g, youcan use this method with either a host name,
domain-qualified if appropriate, or a TCP/IP address, but the connection will
not support advanced services such as connection pooling.
Third-party naming services
Oracle Net can interface with external or third-party naming and authentication
services such as Kerberos or Radius. Use of such services may require Oracle
Advanced Security (known as the Advanced Networking Option prior to
Oracle8i).
These name resolution options are not mutually exclusive.


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