Configuring Naming Methods

Find out how to configure connectivity information for client connections to the database server.

Related Topics

Configuring the Easy Connect Naming Method

The Easy Connect naming method eliminates the need for service name lookup in tnsnames.ora files for TCP/IP environments. In fact, no naming or directory system is required when using this method.

Understanding the Easy Connect Naming Method

The Easy Connect naming method provides out-of-the-box TCP/IP connectivity to databases.

Overview

This naming method extends the functionality of the host naming method by enabling clients to connect to a database server with an optional port and service name in addition to the host name of the database:

CONNECT username@[//]host[:port][/[service_name][:server_type][/instance_name]]
Enter password: password

The connect identifier converts to the following connect descriptor:

(DESCRIPTION=
  (ADDRESS=(PROTOCOL=tcp)(HOST=host)(PORT=port))
  (CONNECT_DATA=
    (SERVICE_NAME=service_name)
    (SERVER=server_type)
    (INSTANCE_NAME=instance_name))
)

If the Oracle Database server installation was performed in Typical mode, then the default service name used by the Oracle instance is the database name, and the following Easy Connect syntax can be used to connect to that instance:

SQLPLUS /nolog
SQL> CONNECT username@host/db_name
SQL> Enter password: password

Easy Connect Syntax Examples

The connect strings in the following example connect the client to database service sales.us.example.com with a listening endpoint of 1521 on database server sales-server:

CONNECT scott@sales-server:1521/sales.us.example.com
CONNECT scott@//sales-server/sales.us.example.com
CONNECT scott@//sales-server.us.example.com/sales.us.example.com

After each of the connect strings, you must enter a password to connect to the database service.

These connect strings convert into the following connect descriptor:

(DESCRIPTION=
  (ADDRESS=(PROTOCOL=tcp)(HOST=sales-server)(PORT=1521))
  (CONNECT_DATA=
    (SERVICE_NAME=sales.us.example.com)))

Connect Identifier for Easy Connect Naming

This is a list of the Easy Connect syntax elements and descriptions for each:

Syntax Element Description
//

Use // to specify a URL or JDBC connection.

Required for URL or JDBC connections. The connect identifier must be preceded by a double-slash (//). For example: 

scott@//sales-server Enter password: password

Optional for SQL connections. The connect identifier can preceded by a double-slash (//). For example, the following connect strings are semantically equivalent: 

SQL> CONNECT scott@sales-server 
SQL> CONNECT scott@//sales-server
host

Required. Specify the host name or IP address of the database host computer.

The host name is domain-qualified if the local operating system configuration specifies a domain.

You may use an IPv4 or IPv6 address as a value. IPv6 addresses or host names that resolve to IPv6 addresses must be enclosed in square brackets, as in [2001:0db8:0:0::200C:417A] and [salesdb].

port

Optional. Specify the listening port.

The default is 1521.
service_name

Optional. Specify the service name of the database.

If a user specifies a service name, then the listener connects the user to that specific database. Otherwise, the listener connects to the database specified by the DEFAULT_SERVICE_listener_name parameter in the listener.ora file. If DEFAULT_SERVICE_listener_name is not configured for the listener and a service name is not explicitly specified by the user as part of the Easy Connect syntax, then the listener returns an error.

server_type

Optional. Specify the database server type to use.

This parameter instructs the listener to connect the client to a specific type of service handler.

The values for the server_type parameter are dedicated, shared, and pooled. If server is not specified in the Easy Connect syntax, then the type of server is chosen by the listener (shared server if configured, otherwise a dedicated server is used).

Note: In Oracle Call Interface documentation, server is referred to as connect_type.

instance_name

Optional. Identify the database instance to access.

The instance name can be obtained from the INSTANCE_NAME parameter in the initialization parameter file.

Related Topics

Support for Easy Connect Plus

Starting with Oracle Database 19c, the Easy Connect syntax that applications use to connect to Oracle Database supports an enhanced functionality known as Easy Connect Plus.

The Easy Connect Plus feature simplifies Oracle Database application configuration and deployment for common use cases. With Easy Connect Plus, you do not need to configure Oracle Net parameter files, such as tnsnames.ora and sqlnet.ora. You also do not need to set the TNS_ADMIN environment variable.

With this enhancement, Easy Connect supports both the TCP and TCPS protocols (earlier, it supported only the TCP transport protocol). This simplifies the client configurations to Oracle Database Cloud Services that mandate TCPS connections for network security.

The enhanced Easy Connect syntax, using the Easy Connect Plus feature, is as follows:

[[protocol:]//]host1{,host12}[:port1]{,host2:port2}[/[service_name][:server][/instance_name]][?parameter_name=value{&parameter_name=value}]

The question mark (?) indicates the start of name-value pairs and the ampersand (&) is the delimiter between the name-value pairs.

Support for specifying protocol: Easy Connect adapter supports specification of protocol as part of the connect string. This protocol is applicable to each host in the connect string.

Multihost or port support: Easy Connect adapter can now accept multiple hosts or ports in the connect string. This helps in load-balancing the client connections.

Name-Value pairs: Easy Connect adapter can now accept a list of name value pairs. Each name-value pair will be added as a DESCRIPTION level parameter.

The following names are supported:

For example, the following syntax to specify the Session Data Unit (SDU)

salesserver1:1521/sales.us.example.com?sdu=16384

translates to the following connect descriptor:

(DESCRIPTION=
  (SDU=16384)
  (ADDRESS=(PROTOCOL=tcp)(HOST=saleserver1)(PORT=1521))
  (CONNECT_DATA=(SERVICE_NAME=sales.us.example.com)))

Similarly, the following syntax to specify connect timeout, transport connect timeout, and retry count values

salesserver1:1521/sales.us.example.com?connect_timeout=1min&transport_connect_timeout=30sec&retry_count=3

translates to the following connect descriptor:

(DESCRIPTION=
   (retry_count=3)
   (connect_timeout=1min)(transport_connect_timeout=30sec)
   (ADDRESS=(PROTOCOL=tcp)(HOST=salesserver1)(PORT=1521))
   (CONNECT_DATA=(SERVICE_NAME=sales.us.example.com)))

Security attributes: The following SECURITY attributes are supported for TLS:

Examples of Easy Connect Naming Method

Examples show Easy Connect Naming syntax and how each string converts into a connect descriptor.

Table 1 Examples of Easy Connect Naming

Naming Option Connect String Connect Descriptor

Easy Connect string with host.

The host name is sales-server. 

sales-server
 
(DESCRIPTION= (CONNECT_DATA= (SERVICE_NAME=)) (ADDRESS= (PROTOCOL=TCP) (HOST=sales-server) (PORT=1521)))

Easy Connect string with host and port.

The host name is sales-server, and the port is 3456. 

sales-server:3456
 
(DESCRIPTION= (CONNECT_DATA= (SERVICE_NAME=)) (ADDRESS= (PROTOCOL=TCP) (HOST=sales-server) (PORT=3456)))

Easy Connect string with host and service name.

The host name is sales-server and the service name is sales. 

sales-server/sales
 
(DESCRIPTION= (CONNECT_DATA= (SERVICE_NAME=sales)) (ADDRESS= (PROTOCOL=TCP) (HOST=sales-server) (PORT=1521)))

Easy Connect string with IPv6 address.

The IPv6 address of the host is 2001:0db8:0:0::200C:417A, the port is 80, and the service name is sales. 

[2001:0db8:0:0::200C:417A]:80/sales

Square brackets are required around IPv6 host names.

 
(DESCRIPTION= (CONNECT_DATA= (SERVICE_NAME=sales) (ADDRESS= (PROTOCOL=TCP) (HOST=2001:0db8:0:0::200C:417A) (PORT=80)))

Easy Connect string with IPv6 host address.

The host is sales-server, the port is 80, and the service name is sales. 

sales-server:80/sales
 
(DESCRIPTION= (CONNECT_DATA= (SERVICE_NAME=sales) (ADDRESS= (PROTOCOL=TCP) (HOST=sales-server) (PORT=80)))

Easy Connect string with host, service name, and server.

The host name is sales-server, the service name is sales, the server is dedicated, and the instance name is inst1

 
sales-server/sales:dedicated/inst1
 
(DESCRIPTION= (CONNECT_DATA= (SERVICE_NAME=sales) (INSTANCE_NAME=inst1) (SERVER=dedicated)) (ADDRESS= (PROTOCOL=TCP) (HOST=sales-server) (PORT=1521)))

Easy Connect with host and instance name.

The host name is sales-server and the instance name is inst1. 

sales-server//inst1
 
(DESCRIPTION= (CONNECT_DATA= (SERVICE_NAME=) (INSTANCE_NAME=inst1)) (ADDRESS= (PROTOCOL=TCP) (HOST=sales-server) (PORT=1521)))

Note: The Easy Connect Plus feature supports this naming option.

Easy Connect adaptor with a list of name value pairs.

SDU, RETRY_COUNT, CONNECT_TIMEOUT

The host is salesserver, the port is 1521, and the service name is sales.

salesserver1:1521/sales?SDU=8128&retry_count=3&connect_timeout=10 
(DESCRIPTION= (SDU=8128)(retry_count=3)(connect_timeout=10) (ADDRESS=(PROTOCOL=tcp)(HOST=saleserver1)(PORT=1521)) (CONNECT_DATA=(SERVICE_NAME=sales)))

Note: The Easy Connect Plus feature supports this naming option.

Easy Connect adapter with multiple hosts or ports in the connect string

The host is salesserver, the port is 1521, and the service name is sales.

salesserver1:1521,salesserver2,salesserver3:1522/sales 
((DESCRIPTION=(LOAD_BALANCE=ON) (ADDRESS=(PROTOCOL=tcp)(HOST=sales-server1)(PORT=1521)) (ADDRESS=(PROTOCOL=tcp)(HOST=sales-server2)(PORT=1522)) (ADDRESS=(PROTOCOL=tcp)(HOST=sales-server3)(PORT=1522))) (CONNECT_DATA=(SERVICE_NAME=sales)))

Note: The Easy Connect Plus feature supports this naming option.

Easy Connect adapter with specification of protocol as part of the connect string.

The host is salesserver, the port is 1521, and the service name is sales.

tcps://salesserver1:1521/sales 
(DESCRIPTION= (ADDRESS=(PROTOCOL=tcps)(HOST=salesserver1)(PORT=1521)) (SECURITY=(TLS_SERVER_DN_MATCH=TRUE)) (CONNECT_DATA=(SERVICE_NAME=sales)))

Note: The Easy Connect Plus feature supports this naming option.

The following SECURITY attributes are supported for TLS

The host is sales-server, the port is 1521, and the service name is sales.

tcps://sales-server:1521/sales?tls_server_cert_dn="cn=sales,cn=OracleContext,dc=us,dc=example,dc=com"&wallet_location="/tmp/oracle" (DESCRIPTION= (ADDRESS=(PROTOCOL=tcps)(HOST=salesserver)(PORT=1521)) (CONNECT_DATA=(SERVICE_NAME=sales))(SECURITY=(TLS_SERVER_DN_MATCH=TRUE)(TLS_SERVER_CERT_DN=cn=sales,cn=OracleContext,dc=us,dc=example,dc=com)(WALLET_LOCATION=/tmp/oracle)))

Related Topics

Configuring Easy Connect Naming on the Client

Learn about the required conditions and configuration tasks that clients need to ensure before using the Easy Connect naming method.

Clients can connect to Oracle Database using Easy Connect naming if the following conditions are met:

Easy Connect naming is not suitable for large or complex environments with advanced features, such as external procedure calls, or Heterogeneous Services, that require additional connect information. In these cases, another naming method is recommended.

Easy Connect naming is automatically configured at installation. Before using it, you may want to ensure that EZCONNECT is specified by the NAMES.DIRECTORY_PATH parameter in the sqlnet.ora file. This parameter specifies the order of naming methods Oracle Net can use to resolve connect identifiers to connect descriptors.

Note:

Starting with Oracle Database 19c Release 2 (19.2), for connections with protocol set to TCPS, TLS_SERVER_DN_MATCH is set to ON by default when using easy connect. If TLS_SERVER_CERT_DN is not set, then a partial DN match done in the following order, should succeed for the client to establish a connection to the server. The host name in the connect string is matched with the host name in the server certificate. The service name in the connect string is matched with the service name in the server certificate. If TLS_SERVER_CERT_DN is set, then a full DN match should succeed for the client to establish a connection to the server.

The following procedure describes how to verify that the Easy Connect naming method is configured:

  1. Start Oracle Net Manager.

  2. In the navigator pane, expand Local, and then select Profile.

  3. From the list in the right pane, select Naming.

  4. Click the Methods tab.

    Verify that EZCONNECT is listed in the Selected Methods list. If it is not, then proceed to Step 5. If it is listed, then proceed to Step 7.

  5. From the Available Methods list, select **EZCONNECT**, and then click the right-arrow button.

  6. In the Selected Methods list, select EZCONNECT, and then use the Promote button to move the selection to the top of the list.

  7. Select **Save Network Configuration** from the File menu. The `sqlnet.ora` file updates the NAMES.DIRECTORY_PATH parameter, listing `hostname` first: 
    NAMES.DIRECTORY_PATH=(ezconnect, tnsnames)

Related Topics

Configuring Easy Connect Naming to Use a DNS Alias

You can optionally configure a DNS alias for the host name, as provided with the host naming method.

With host naming, clients use a connect string that uses the following pattern:

CONNECT username@DNS_alias
Enter password: password

The following procedure describes how to configure a DNS alias:

  1. Ensure the database service is registered with the listener.

    If the database can find the listener, then information about the database service is dynamically registered with the listener during service registration, including the service name. The listener is found if the following conditions are met:

    • The default listener named LISTENER on TCP/IP, port 1521 is running.

    • The LOCAL_LISTENER parameter is set in the initialization file.

    If the database cannot find the listener, then you can configure static registration for the listener.

  2. Establish a host name resolution environment.

    You can configure a mechanism such as DNS, NIS, or a centrally-maintained TCP/IP host file, /etc/hosts. For example, if a service name of sales.us.example.com for a database exists on a computer named sales-server, then the entry in the /etc/hosts file would look like the following:

    #IP address of server     host name       alias
192.0.2.35              sales-server    sales.us.example.com

    The domain section of the service name must match the network domain.

  3. Connect to the database using the DNS alias.

    Using the example in the previous step, the client can use sales.example.com in the connect string:

    CONNECT username@sales.us.example.com
Enter password: password

    If the client and server are in the same domain such as us.example.com, then the client must enter only sales in the connect string.

Related Topics

Configuring the Local Naming Method

The local naming method adds network service names to the tnsnames.ora file. Each network service name maps to a connect descriptor.

The following example shows the network service name sales mapped to the connect descriptor contained in DESCRIPTION. The DESCRIPTION section contains the protocol address and identifies the destination database service. In this example, the protocol is TCP/IP and the port is 1521.

Example 8-1 Connector Descriptor with Host Name

sales=
(DESCRIPTION=
  (ADDRESS=(PROTOCOL=tcp)(HOST=sales-server)(PORT=1521))
  (CONNECT_DATA=
     (SERVICE_NAME=sales.us.example.com)))

The following example shows a valid tnsnames.ora entry to connect to a host identified with an IPv6 address and a port number of 1522.

Example 8-2 Connect Descriptor with IPv6 Address

salesdb =
  ( DESCRIPTION =
    ( ADDRESS=(PROTOCOL=tcp)(HOST=2001:0db8:1:1::200C:417A)(PORT=1522) )
    ( CONNECT_DATA =
        (SERVICE_NAME=sales.example.com) )
  )

You can configure local naming during or after installation, as described in the following sections:

Related Topics

Configuring the tnsnames.ora File During Installation

Oracle Net Configuration Assistant enables you to configure network service names for clients. Oracle Universal Installer launches Oracle Net Configuration Assistant after software installation. The configuration varies depending on the installation mode.

Configuring the tnsnames.ora File After Installation

You can add network service names to the tnsnames.ora file at any time after installation.

To configure the local naming method, perform the following tasks:

Note: The underlying network connection must be operational before attempting to configure connectivity with Oracle Net.

Task 1 Configure Net Services Names

To configure the network services names, use one of the following methods:

Each method provides similar functionality. However, Oracle Net Manager has more configuration options for the sqlnet.ora file.

Task 2 Configure Local Naming as the First Naming Method

Configure local naming as the first method specified in the NAMES.DIRECTORY_PATH parameter in the sqlnet.ora file. This parameter specifies the order of naming methods Oracle Net uses to resolve connect identifiers to connect descriptors.

To configure the local naming method as the first naming method, use one of the following methods:

Each method provides the same functionality.

Local Naming Configuration using Oracle Enterprise Manager Cloud Control

The following procedure describes how to specify local naming as the first naming method using Oracle Enterprise Manager Cloud Control:

  1. Access the Net Services Administration page in Oracle Enterprise Manager Cloud Control.

    See Also: “Accessing the Net Services Administration Page”

  2. SelectNetwork Profile from the Administer list.

  3. Click Go.

  4. Select Naming Methods.

  5. Select TNSNAMES from the Available Methods list.

  6. Click Move to move the selection to the Selected Methods list.

  7. Use the Promote button to move TNSNAMES to the top of the list.

  8. Click OK.

Local Naming Configuration using Oracle Net Manager

The following procedure describes how to specify local naming as the first naming method using Oracle Net Manager:

  1. Start Oracle Net Manager.

    See Also: “Using Oracle Net Manager to Configure Oracle Net Services”

  2. In the navigator pane, select Profile from the Local menu.

  3. From the list in the right pane, select Naming.

  4. Click the Methods tab.

  5. From the Available Methods list, select TNSNAMES, and then click the right-arrow button.

  6. From the Selected Methods list, select TNSNAMES, and then use the Promote button to move the selection to the top of the list.

  7. Choose Save Network Configuration from the File menu.

    The sqlnet.ora file updates with the NAMES.DIRECTORY_PATH parameter, listing tnsnames first:

    NAMES.DIRECTORY_PATH=(tnsnames, EZCONNECT)

Task 3 Copy the Configuration to the Other Clients

After one client is configured, copy the tnsnames.ora and sqlnet.ora configuration files to the same location on the other clients. This ensures that the files are consistent. Alternatively, you can use Oracle Net Assistant on every client.

Task 4 Configure the Listener

Ensure that the listener located on the server is configured to listen on the same protocol address configured for the network service name. By default, the listener is configured for the TCP/IP protocol on port 1521.

See Also: Configuring and Administering Oracle Net Listener for listener configuration details

Task 5 Connect to the Database

Clients can connect to the database using the following syntax:

CONNECT username@net_service_name

Configuring the Directory Naming Method

With this naming method, connect identifiers are mapped to connect descriptors contained in an LDAP-compliant directory server, such as Oracle Internet Directory or Microsoft Active Directory.

A directory provides central administration of database services and network service names, making it easier to add or relocate services.

Configure Net Service Name, Database Service, and Alias Entries

You can use Oracle Enterprise Manager Cloud Control and Oracle Net Manager to configure network service names, network service alias entries, and database service entries. Clients can use these entries to connect to the database.

  1. Verify Directory Compatibility:

    On the computer from which you plan to create network service names, do the following verification steps:

    1. Ensure the computer has the latest release of Oracle Net Services software. The release information is located in the About Net Manager option on the help menu.

    2. Run Oracle Internet Directory Configuration Assistant to verify directory server, Oracle Context, and Oracle schema releases.

  2. Create Net Service Names in the Directory:

    You can configure clients to use a network service name rather than the database service entry.

    Note:

    1. Access the Net Services Administration page in Oracle Enterprise Manager Cloud Control. See Accessing the Net Services Administration Page.

    2. Select Directory Naming from the Administer list, and then select the Oracle home that contains the location of the directory server.

    3. Click Go.

      The Directory Naming page appears.

    4. Click the Net Service Names tab.

    5. In the Results section, click Create.

      The Create Net Service Name page with the General tab appears.

    6. Enter a name in the Net Service Name field.

    7. In the Database Information section, configure service support, as follows:

      1. Enter a destination service name. See About Connect Descriptors.

      2. Select a database connection type. Oracle recommends that you use the Database Default for the connection type. If a shared server is configured in the initialization parameter file, then the following options are available:

        • Select Dedicated Server to force the listener to spawn a dedicated server, and bypass shared server configuration.

        • Select Shared Server to guarantee the connection always uses shared server.

        See Configuring a Shared Server Architecture.

    8. In the Addresses section, configure protocol support:

      1. Click Add.

        The Add Address page appears.

      2. From the Protocol list, select the protocol that the listener is configured to listen. This protocol must also be installed on the client.

      3. Enter the appropriate parameter information for the selected protocol in the fields provided.

        See Oracle Database Net Services Reference.

      4. (Optional) In the Advanced Parameters section, specify the I/O buffer space limit for send and receive operations of sessions in the Total Send Buffer Size and Total Receive Buffer Size fields. See Configuring I/O Buffer Space.

      5. Click OK.

        The protocol address is added to the Addresses section.

    9. Click OK to add the network service name.

      The network service name is added to the Results section of the Net Service Names tab.

      See Creating a List of Listener Protocol Addresses to configure multiple protocol addresses. See About the Advanced Connect Data Parameters to configure additional CONNECT_DATA options.

  3. Create or Modify Connectivity Information for Database Service Entries:

    A database service entry is created during installation. When database registration with the directory naming completes, a database service entry is created in the directory. By default, this entry contains network route information with the location of the listener through a protocol address. You can re-create this information or modify the existing network route information.

    Note: Only users that are members of the OracleNetAdmins or OracleContextAdmins group can modify network information for a database service in a directory. To add or remove users from these groups, see Who Can Add or Modify Entries in the Directory Server.

    1. Access the Net Services Administration page in Oracle Enterprise Manager Cloud Control. See Accessing the Net Services Administration Page.

    2. Select Directory Naming from the Administer list, and then select the Oracle home that contains the location of the directory server.

    3. Click Go. You may be prompted to log in to the database server and the directory server.

      The Directory Naming page appears.

    4. Click the Database Services tab.

    5. In the Simple Search section, select Oracle Context and search criteria to see the network service names for Oracle Context.

      The database service names display in the Results section.

    6. In the Results section, select a database service, and then click Edit.

  4. Create Net Services Aliases:

    Net service aliases in a directory server enable clients to refer to a database service or a network service name by an alternative name. For example, a network service alias of salesalias can be created for a network service name of sales. When salesalias is used to connect to a database, as in CONNECT scott@salesalias, it resolves to and use the connect descriptor information for sales.

    There are two main uses of network service aliases:

    • Use a network service alias as a way for clients to refer to a database service or network service name by another name.

    • Use a network service alias in one Oracle Context for a database service or network service name in a different Oracle Context. This enables a database service or network service name to be defined once in the directory server, and referred to by clients that use other Oracle Contexts. See Understanding Net Service Alias Entries for an overview of network service aliases.

    Note:

    • Only users that are members of either the OracleNetAdmins or OracleContextAdmins group can create or modify network service alias entries in a directory. To add or remove users from the OracleNetAdmins group, see Who Can Add or Modify Entries in the Directory Server.

    • Net service aliases are not supported by Microsoft Active Directory.

    • Ensure the NLS_LANG environment variable is set for the clients when using network service aliases.

    To create a network service alias, use one of the following methods. Each method provides similar functionality:

    • Network Service Alias Configuration using Oracle Enterprise Manager Cloud Control

      The following procedure describes how to configure a network service alias using Oracle Enterprise Manager Cloud Control:

      1. Access the Net Services Administration page in Oracle Enterprise Manager Cloud Control. See Accessing the Net Services Administration Page.

      2. SelectDirectory Naming from the Administer list, and then select the Oracle home that contains the location of the directory server.

      3. Click Go.

        The Directory Naming page appears.

      4. Click the Net Service Aliases tab.

      5. In the Results section, click Create.

        The Create Net Service Alias page appears.

      6. Enter a name for the alias in the Net Service Alias Name field.

      7. In the Referenced Service Detail section, enter the following information in the fields:

        • Oracle Context: Select the Oracle Context of the database service or network service name from the list or enter one in the field.

        • Referenced Service Name: Select the DN of the database service or network service name.

      8. Click OK to add the network service alias.

        The network service alias is added to the Directory Naming page.

    • Network Service Alias Configuration using Oracle Net Manager

      The following procedure describes how to configure a network service alias using Oracle Net Manager:

      1. Start Oracle Net Manager. See Using Oracle Net Manager to Configure Oracle Net Services.

      2. In the navigator pane, select Service Naming from Directory.

      3. Select Aliases.

      4. Select Create from the Edit menu.

      5. Enter the network service alias in the Net Service Alias field.

      6. Select Oracle Context and name.

      7. Click Create.

      8. Select Save Network Configuration from the File menu.

  5. Configure LDAP as the First Naming Method for Client Lookups:

    Configure directory naming as the first method to be used in the NAMES.DIRECTORY_PATH parameter in the sqlnet.ora file. This parameter specifies the order of naming methods Oracle Net uses to resolve connect identifiers to connect descriptors.

    To configure LDAP as the first naming method you can use one of the following methods:

    • LDAP Configuration using Oracle Enterprise Manager Cloud Control

      The following procedure describes how to specify directory naming as the first naming method using Oracle Enterprise Manager Cloud Control:

      1. Access the Net Services Administration page in Oracle Enterprise Manager Cloud Control. See Accessing the Net Services Administration Page.

      2. SelectNetwork Profile from the Administer list.

      3. Click Go.

      4. Select Naming Methods.

      5. Select LDAP from the Available Methods list.

      6. Click Move to move the selection to the Selected Methods list.

      7. Use the Promote button to move LDAP to the top of the list.

      8. Click OK.

    • LDAP Configuration using Oracle Net Manager

      The following procedure describes how to specify directory naming as the first naming method using Oracle Net Manager:

      1. Start Oracle Net Manager. See Using Oracle Net Manager to Configure Oracle Net Services.

      2. In the navigator pane, select Profile from the Local menu.

      3. From the list in the right pane, select Naming.

      4. Click the Methods tab.

      5. From the Available Methods list, select LDAP, and then click the right-arrow button.

      6. From the Selected Methods list, select LDAP, and then use the Promote button to move the selection to the top of the list.

      7. Select Save Network Configuration from the File menu.

        The sqlnet.ora file updates with the NAMES.DIRECTORY_PATH parameter, listing ldap first, such as the following:

        NAMES.DIRECTORY_PATH=(ldap, tnsnames, hostname)

  6. Configure the Listener:

    Ensure that the listener located on the server is configured to listen on the same protocol address configured for the network service name. By default, the listener is configured to listen on the TCP/IP protocol, port 1521. See Configuring and Administering Oracle Net Listener for listener configuration details.

  7. Connect to the Database:

    Clients that are configured with a default directory entry that matches the directory location of the database service or network service name can connect to the database using the following syntax:

    CONNECT username@connect_identifier

    Clients that are configured with a default directory entry that does not match the entry’s directory location must use the entry’s distinguished name or its fully-qualified name. SeeUnderstanding the Directory Information Tree for fully-qualified name usage.

Create Multiple Default Contexts in a Directory Naming Server

To enable multiple default contexts, define the orclCommonContextMap with a list of associations between a domain and a DN to be used as the default oracleContext.

If you want clients to use discovery in directories which have more than one Oracle Context, then you can define the orclCommonContextMap attribute in the base admin context. This attribute overrides the orclDefaultSubscriber attribute. During name lookup the discovery operation returns both values, and the client decides based on these which Oracle Context to use.

If the orclCommonContextMap attribute is not defined, then the orclDefaultSubscriber is used as the default. If orclCommonContextMap is defined, then the client finds the default Oracle Context which is associated with its DNS domain in the orclCommonContextMap.

Here is a sample LDIF file entry:

$ ldapmodify -v -h sales-server -p 1389 -D cn=orcladmin -q
 dn: cn=Common,cn=Products,cn=OracleContext
 replace: orclCommonContextMap
 orclCommonContextMap:
 (contextMap=
   (domain_map=(domain=us.example.com)(DN="dc=example,dc=com"))
   (domain_map=(domain=uk.example.com)(DN="dc=sales,dc=com"))
  )

You must enter a contextMap entry without line breaks.

Related Topics

Export Local Naming Entries to a Directory Naming Server

If a tnsnames.ora file already exists, then you can export the network service names stored in that file to a directory server. These tasks assume the directory server has been installed and is running.

The export procedure is performed for one domain at a time.

Task 1 Create Structure in the Directory Server

In the directory server, create the directory information tree (DIT) with the structure in which you want to import network service names. Create the structure leading to the top of the Oracle Context.

For example, if the tnsnames.ora file supports a domain structure example.com and you want to replicate this domain in the directory, then create domain component entries of dc=com and dc=example in the directory, as shown in the following figure.

Figure 1: example.com in Directory Server

Description of the illustration netag123.gif

You can replicate the domain structure you currently use with tnsnames.ora, or you can develop an entirely different structure. Introducing an entirely different structure can change the way clients enter the network service name in the connect string. Oracle recommends considering relative and fully-qualified naming issues before changing the structure.

Task 2 Create Oracle Contexts

Create an Oracle Context under each DIT location that you created in Task 1 using Oracle Internet Directory Configuration Assistant. Oracle Context has a relative distinguished name (RDN) of cn=OracleContext. Oracle Context stores network object entries, as well as other entries for other Oracle components. In the following figure, cn=OracleContext is created under dc=example,dc=com.

Figure 2: Oracle Context

Description of the illustration netag122.gif

Task 3 Configure Directory Server Usage

If not done as a part of creating Oracle Contexts, then configure the Oracle home for directory server use. The Oracle home you configure should be the one that performs the export.

Task 4 Export Objects to a Directory Server

To export network service names contained in a tnsnames.ora file to a directory, use either Oracle Enterprise Manager Cloud Controlr or Oracle Net Manager.

Related Topics

Export Directory Naming Entries to the tnsnames.ora file

After you create the directory naming entries, consider exporting the entries to a local tnsnames.ora file and distributing that file to clients. Clients can use the locally saved file when the directory server is temporarily unavailable.

The following procedure describes how to export directory naming entries to a local tnsnames.ora file:

  1. Access the Net Services Administration page in Oracle Enterprise Manager Cloud Control.

  2. Select Directory Naming from the Administer list, and then select the Oracle home that contains the location of the directory server.

  3. Click Go.

    The Directory Naming page appears.

  4. Click the Net Service Names tab.

  5. In the Simple Search section, select Oracle Context and search criteria to see the network service names for a particular Oracle Context.

    The network service names display in the Results section.

  6. In the Results section, click Save to tnsnames.ora.

    The Processing: Create tnsnames.ora File page appears, informing you of the creation process.

Related Topics

Configuring External Naming Methods

External naming refers to the method of resolving a network service name, stored in a third-party naming service, to a network address, such as network information services (NIS). Organizations and corporations using NIS as part of their systems infrastructure have the option to store network service names and addresses in NIS, using NIS external naming.

For example, when a user gives a command with a network service name (payroll) such as the following:

	SQLPLUS scott@payroll

NIS external naming on the node running the client program or database server acting as a client program contacts an NIS server located on the network, and passes the network service name to the NIS server. The NIS server resolves the network service name into an Oracle Net address and returns this address to the client program or server. The client program then uses this address to connect to Oracle Database.

An NIS server runs a program called ypserv, which handles name requests. The ypserv program stores different types of data in special files called maps. For example, passwords are stored in a map called passwd.byname. Oracle Database service names are stored in a map called tnsnames.

When a user uses a connect string, NIS external naming uses an RPC call to contact the ypserv program, and passes the Oracle network service name and the name of the map. The ypserv program looks in the tnsnames map for the name, such as payroll, and its address for the network service name. The address is returned to the client, and the client program uses the address to contact the database server.

Note:

The NIS external naming method is not available on all platforms. Use the adapters command to check availability of NIS external naming on your system. If available, then it is listed under Oracle Net naming methods, as follows:

$ adapters

Installed Oracle Net naming methods are:

Local Naming (tnsnames.ora)
Oracle Directory Naming
Oracle Host Naming
NIS Naming

See Oracle platform-specific documentation for additional information.

This section contains the following tasks:

Task 1 Configure NIS Servers to Support NIS External Naming

Before configuring servers to support NIS external naming, ensure that NIS is configured and running on the NIS servers that need to resolve Oracle Database network service names. Consult your NIS documentation for specifics. To complete this task, add the tnsnames map to the existing NIS maps, and then verify that the tnsnames map has been installed properly.

  1. Create a tnsnames.ora file, as specified in “Configuring the Local Naming Method”.

    Note: Keep a copy of the tnsnames.ora file, preferably in the ORACLE_HOME/network/admin directory. You may need to use this file again later to load network service names into the NIS map.

  2. Convert the contents of the tnsnames.ora file to a tnsnames map using the tns2nis program using a command similar to the following:

    tns2nis tnsnames.ora

    The tns2nis program reads the tnsnames.ora file from the current directory. If the tnsnames.ora file is not located in the current directory, then use a full path name to specify its location, such as /etc/tnsnames.ora or ORACLE_HOME/network/admin/tnsnames.ora.

    The tnsnames map is then written into the current working directory.

    Note: The tns2nis program is supplied with NIS external naming.

  3. Copy the tnsnames map to the NIS server.

  4. Install the tnsnames map using makedbm, which is an NIS program.

    Note: This step must be performed by the person in charge of NIS administration.

    The makedbm program converts the tnsnames map into two files that the NIS server can read. The location of these files is operating system specific.

    For example, to generate and install a tnsnames map on Linux, as the root user, enter the following at the command line:

    # makedbm tnsnames /var/yp/'domainname'/tnsnames

    See Also: Oracle operating system-specific documentation for details

  5. Verify tnsnames has been installed properly using the following command:

    ypmatch net_service_name tnsnames

    For example, you might enter the following command:

    ypmatch example.com tnsnames

    This returns the length of the address in characters, followed by the address such as the following:

    99 (description=(address=(protocol=tcp) (host=sales)(port=1999)))
   (connect_data=(service_name=dirprod)))

Task 2 Configure the Clients

To configure clients, configure NIS as the first method specified in the NAMES.DIRECTORY_PATH parameter in the sqlnet.ora file. This parameter specifies the order of naming methods Oracle Net can use to resolve connect identifiers to connect descriptors.

  1. Start Oracle Net Manager.

    See Also: “Using Oracle Net Manager to Configure Oracle Net Services”

  2. In the navigator pane, select Profile from the Local menu.

  3. From the list in the right pane, select Naming.

  4. Click the Methods tab.

  5. From the Available Methods list, select NIS, and then click the right-arrow button.

  6. In the Selected Methods list, select NIS, and then use the Promote button to move the selection to the top of the list.

  7. Select Save Network Configuration from the File menu.

    The sqlnet.ora file updates with the NAMES.DIRECTORY_PATH parameter, listing nis first:

    NAMES.DIRECTORY_PATH=(nis, hostname, tnsnames)