This chapter describes how to configure Oracle Net Services. It contains the following sections:
See Also:
Oracle Database Net Services Administrator's Guide for more information about Oracle Net ServicesOracle Net Services configuration files are typically, but not always, located in the $ORACLE_HOME/network/admin directory. Depending on the type of file, Oracle Net uses a different search order to locate the file.
The search order for the sqlnet.ora and ldap.ora files is as follows:
The directory specified by the TNS_ADMIN environment variable, if this environment variable is set
The $ORACLE_HOME/network/admin directory
The search order for the cman.ora, listener.ora, and tnsnames.ora files is as follows:
The directory specified by the TNS_ADMIN environment variable, if this environment variable is set
One of the following directories:
On Oracle Solaris:
/var/opt/oracle
On other platforms:
/etc
The $ORACLE_HOME/network/admin directory
For some system-level configuration files, users may have a corresponding user-level configuration file stored in their home directory. The settings in the user-level file override the settings in the system-level file. The following table lists the system-level configuration files and the corresponding user-level configuration files:
| System-Level Configuration File | User-Level Configuration File |
|---|---|
sqlnet.ora |
$HOME/.sqlnet.ora |
tnsnames.ora |
$HOME/.tnsnames.ora |
The $ORACLE_HOME/network/admin/samples directory contains samples of the cman.ora, listener.ora, sqlnet.ora, and tnsnames.ora configuration files.
Note:
Thecman.ora file is installed only if you select Connection Manager as part of a custom option during a client custom installation.The adapters utility displays the transport protocols, naming methods, and Oracle Advanced Security options that Oracle Database supports on the system.
See Also:
Oracle Database Net Services Administrator's Guide for more information about theadapters utilityOracle protocol support is a component of Oracle Net. It includes the following:
Each of the IPC, TCP/IP, and TCP/IP with Secure Sockets Layer protocol support have an address specification that is used in Oracle Net Services configuration files and in the DISPATCHER initialization parameter. The following sections describe the address specifications for each of the protocol supports.
See Also:
Oracle Database Net Services Administrator's Guide for more information about Oracle protocol supportThe IPC protocol support can be used only when the client program and Oracle Database are installed on the same system. This protocol support requires a listener. It is installed and linked to all client tools and the oracle executable.
The IPC protocol support requires an address specification in the following format:
(ADDRESS = (PROTOCOL=IPC)(KEY=key))
The following table describes the parameters used in this address specification:
| Parameter | Description |
|---|---|
| PROTOCOL | The protocol to be used. The value is IPC. It is not case-sensitive. |
| KEY | Any name that is different from any other name used for an IPC KEY on the same system. |
The following is a sample IPC protocol address:
(ADDRESS= (PROTOCOL=IPC)(KEY=EXTPROC))
TCP/IP is the standard communication protocol used for client/server communication over a network. The TCP/IP protocol support enables communication between client programs and Oracle Database, whether they are installed on the same or different systems. If the TCP/IP protocol is installed on the system, then the TCP/IP protocol support is installed and linked to all client tools and to the oracle executable.
The TCP/IP protocol support requires an address specification in the following format:
(ADDRESS = (PROTOCOL=TCP)(HOST=hostname)(PORT=port))
The following table describes the parameters used in this address specification:
| Parameter | Description |
|---|---|
| PROTOCOL | The protocol support to be used. The value is TCP. It is not case-sensitive. |
| HOST | The host name or the host IP address. |
| PORT | The TCP/IP port. Specify the port as either a number or the alias name mapped to the port in the /etc/services file. Oracle recommends a value of 1521. |
The following is a sample TCP/IP protocol address:
(ADDRESS= (PROTOCOL=TCP)(HOST=MADRID)(PORT=1521))
The TCP/IP with Secure Sockets Layer protocol support enables an Oracle application on a client to communicate with remote Oracle Database instances through TCP/IP and Secure Sockets Layer.
The TCP/IP with Secure Sockets Layer protocol support requires an address specification in the following format:
(ADDRESS = (PROTOCOL=TCPS)(HOST=hostname)(PORT=port))
The following table describes the parameters used in this address specification:
| Parameter | Description |
|---|---|
| PROTOCOL | The protocol to be used. The value is TCPS. It is not case-sensitive. |
| HOST | The host name or the host IP address. |
| PORT | The TCP/IP with Secure Sockets Layer port. Specify the port as either a number or the alias name mapped to the port in the /etc/services file. Oracle recommends a value of 2484. |
The following is a sample TCP/IP with Secure Sockets Layer protocol address:
(ADDRESS= (PROTOCOL=TCPS)(HOST=MADRID)(PORT=2484))
Oracle recommends that you reserve a port for the listener in the /etc/services file of each Oracle Net Services node on the network. The default port is 1521. The entry lists the listener name and the port number. For example:
oraclelistener 1521/tcp
In this example, oraclelistener is the name of the listener as defined in the listener.ora file. Reserve multiple ports if you intend to start multiple listeners.
If you intend to use Secure Sockets Layer, then you should define a port for TCP/IP with Secure Sockets Layer in the /etc/services file. Oracle recommends a value of 2484. For example:
oraclelistenerssl 2484/tcps
In this example, oraclelistenerssl is the name of the listener as defined in the listener.ora file. Reserve multiple ports if you intend to start multiple listeners.