What role does Sqlnet.ora have in listening?

The two most commonly used features of Sqlnet.ora are:

Client Action = = Connection method specifies the order in which the name of the client is named to resolve the query. ==>> NAMES. Directory_path= (TNSNames, Onames, hostname)

Service side and client at the same time = = Authentication Way ==>> sqlnet. Authentication_services

Sqlnet.ora content Details of the official documents: http://docs.oracle.com/cd/B19306_01/network.102/b14213/sqlnet.htm#NETRF006

Configure Sqlnet.ora to restrict IP access to Oracle http://blog.csdn.net/leshami/article/details/6629141

Some important parameters and explanations:

1.bequeath_detach

The switch that controls the signal handling in the UNIX system is the default no, that is, signal handling open.

2.default_sdu_size

Specifies the size of the session data Unit (SDU), which is bytes, and recommends that you set this parameter on both the client side and the server side to ensure that the same SDU size is used when linking. If the client-side and server-side configured values do not match, the smaller ones are used.

3.log_directory_client/log_directory_server

Specify the location of the client-side/server log file

4.NAMES. Default_domain

Set the domain where the client resolves the name

5.NAMES. Directory_path

Specifies the order of the client name resolution method, which defaults to Names.directory_path= (TNSNames, Onames, hostname)

The value can be TNSNAMES,LDAP (dictionary server), Hostname/ezconnect,cds (Distributed Environment), NIS (Network Information Service (NIS)

6.sqlnet_allowed_logon_versions

Specifies the version of Oracle running the link sqlnet_allowed_logon_versions= (10,9,8)

7.SQLNET. Authentication_services

Specify to start one or more authentication services

Authentication Methods Available with Oracle Net Services:

None for no authentication methods. A valid username and password can is used to access the database.

All to all authentication methods

NTS for Windows NT native authentication

8.SQLNET. Inbound_connect_timeout

Specifies the time when the client does not have a link success timeout. Oracle interrupts the link and complains when the timeout expires.

9.ssl_version

Specify the version of the SSL link

10.TCP. Excluded_nodes

Specifies that nodes that are not allowed access to Oracle can use host names or IP addresses

11.TCP. Invited_nodes

Specifies that clients that are allowed access to DB have higher priority than tcp.excluded_nodes.

12.TCP. Validnode_checking

Use this parameter to enable the top two parameters.

13.TNSPING. Trace_directory

Use this parameter to specify the directory of the tnsping trace file, which is the default $oracle_home/network/trace directory

More parameter information see: Oracle Database Net Services Reference

##################

The sequential way of parsing a query when connected experiment: ==>> NAMES. Directory_path= (TNSNames, Onames, hostname)

Instructions on the official document: use the parameter NAMES. Directory_path to specify the "naming methods used for client name resolution lookups.

NAMES. directory_path==>> specifies the order in which name resolution queries are used for client-side naming methods. No connection mode in this parameter will be available.

[Oracle@ocm1 admin]$ Cat Tnsnames.ora

BYS3 =

(DESCRIPTION =

(address = (PROTOCOL = TCP) (HOST = 192.168.1.211) (PORT =1521)

(Connect_data =

(SERVER = dedicated)

(service_name = BYS3)

)

)

1. Configuration Sqlnet.ora contains: names.directory_path= (tnsnames), can only use the local name in TNSNames, easy connection will error

Example:

[Oracle@ocm1 admin]$ VI Sqlnet.ora

NAMES. Directory_path= (TNSNames)

~

[ORACLE@OCM1 admin]$ sqlplus BYS/BYS@BYS3--use local name to connect

Sql*plus:release 10.2.0.1.0-production on Fri 17 11:13:16 2014

Copyright (c) 1982, +, Oracle. All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition release 11.2.0.4.0-production

With the partitioning, OLAP, Data Mining and real application testing options

Sql> exit

[ORACLE@OCM1 admin]$ sqlplus BYS/BYS@192.168.1.211:1521/BYS3--Use simple connection method, cannot connect

Sql*plus:release 10.2.0.1.0-production on Fri 17 11:13:27 2014

Copyright (c) 1982, +, Oracle. All rights reserved.

ERROR:

Ora-12154:tns:could not resolve the connect identifier specified

2. Configuration Sqlnet.ora contains: names.directory_path= (Tnsnames,ezconnect), at this time use TNSNames in this place name and simple connection can be

[Oracle@ocm1 admin]$ Cat Sqlnet.ora

NAMES. Directory_path= (Tnsnames,ezconnect)

Use of this place name and simple connection in TNSNames can be

[Oracle@ocm1 admin]$ Sqlplus Bys/bys@bys3

Sql*plus:release 10.2.0.1.0-production on Fri 17 11:18:47 2014

Copyright (c) 1982, +, Oracle. All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition release 11.2.0.4.0-production

With the partitioning, OLAP, Data Mining and real application testing options

Sql>

[Oracle@ocm1 admin]$ Sqlplus Bys/bys@192.168.1.211:1521/bys3

Sql*plus:release 10.2.0.1.0-production on Fri 17 11:13:59 2014

Copyright (c) 1982, +, Oracle. All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition release 11.2.0.4.0-production

With the partitioning, OLAP, Data Mining and real application testing options

Sql> exit

#################################################

Service side and client at the same time = = Authentication Way ==>> sqlnet. Authentication_services

There are three parameters:

None for no authentication methods. A valid username and password can is used to access the database.

All to all authentication methods

NTS for Windows NT native authentication---this is only useful for Windows.

When client and server sqlnet.authentication_services= (all) cannot log in with aa/bb username password. One side is none to connect.

1. Server-side does not configure Sqlnet.ora files, the client configuration sqlnet.authentication_services= (all), you can log on normally.

[Oracle@ocm1 admin]$ Cat Sqlnet.ora

NAMES. Directory_path= (Tnsnames,ezconnect)

Sqlnet. Authentication_services= (All)

[Oracle@ocm1 admin]$ Sqlplus Bys/bys@bys3

Sql*plus:release 10.2.0.1.0-production on Fri 17 11:24:45 2014

Copyright (c) 1982, +, Oracle. All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition release 11.2.0.4.0-production

With the partitioning, OLAP, Data Mining and real application testing options

Sql>

2. When client and server are configured simultaneously: sqlnet.authentication_services= (All) cannot login with aa/bb username password

--The next step:

[Oracle@bys3 admin]$ Cat Sqlnet.ora

Sqlnet. Authentication_services= (All)

Test from OCM1 Host: Login error: ORA-12641:

[Oracle@ocm1 admin]$ Sqlplus Bys/bys@bys3

Sql*plus:release 10.2.0.1.0-production on Fri 17 11:27:29 2014

Copyright (c) 1982, +, Oracle. All rights reserved.

ERROR:

Ora-12641:authentication Service failed to initialize

At this point, the client or one of the server's Sqlnet.ora changed to Sqlnet.authentication_services= (NONE), you can connect-the same as the first step of the experiment.

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