1. 5 Copyright © 2007, Oracle. All rights reserved. Configuring the Oracle Network Environment

2. Copyright © 2007, Oracle. All rights reserved. 5 - 2 Objectives After completing this lesson, you should be able to: Use Enterprise Manager to: –Create additional listeners –Create Oracle Net Service aliases –Configure connect-time failover –Control the Oracle Net Listener Use tnsping to test Oracle Net connectivity Identify when to use shared servers and when to use dedicated servers

3. Copyright © 2007, Oracle. All rights reserved. 5 - 3 Oracle Net Services Application Oracle Net RDBMS Oracle Net Client or middle tier Database server TCP/IP network Listener Oracle Net configuration files Oracle Net configuration files

4. Copyright © 2007, Oracle. All rights reserved. 5 - 4 Oracle Net Listener Listener /network/admin/listener.ora sqlnet.ora Oracle databases Oracle Net configuration files Enterprise Manager Database Control

5. Copyright © 2007, Oracle. All rights reserved. 5 - 5 Establishing Net Connections To make a client or middle-tier connection, Oracle Net requires the client to know the: Host where the listener is running Port that the listener is monitoring Protocol that the listener is using Name of the service that the listener is handling Names resolution

6. Copyright © 2007, Oracle. All rights reserved. 5 - 6 Listener Establishing a Connection Incoming connection request

7. Copyright © 2007, Oracle. All rights reserved. 5 - 7 Server process User Sessions PGA Listener User session User process

8. Copyright © 2007, Oracle. All rights reserved. 5 - 8 Tools for Configuring and Managing the Oracle Network Enterprise Manager Net Services Administration page Oracle Net Manager Oracle Net Configuration Assistant launched by Oracle Universal Installer Command line

9. Copyright © 2007, Oracle. All rights reserved. 5 - 9 Notes Only

10. Copyright © 2007, Oracle. All rights reserved. 5 - 10 Listener Control Utility Oracle Net listeners can be controlled with the lsnrctl command-line utility (or from EM). [oracle@edrsr17p1 ~]$ lsnrctl LSNRCTL for Linux: Version 11.1.0.3.0 - Beta on 30-MAY-2007 22:38:19 Copyright (c) 1991, 2006, Oracle. All rights reserved. Welcome to LSNRCTL, type "help" for information. LSNRCTL> help The following operations are available An asterisk (*) denotes a modifier or extended command: start stop status services version reload save_config trace spawn change_password quit exit set* show*

11. Copyright © 2007, Oracle. All rights reserved. 5 - 11 Listener Control Utility Syntax Commands from the listener control utility can be issued from the command line or from the LSNRCTL prompt. UNIX or Linux command-line syntax: Prompt syntax: $ lsnrctl $ lsnrctl start $ lsnrctl status LSNRCTL> LSNRCTL> start LSNRCTL> status

12. Copyright © 2007, Oracle. All rights reserved. 5 - 12 Notes Only

13. Copyright © 2007, Oracle. All rights reserved. 5 - 13 Listener Home Page

14. Copyright © 2007, Oracle. All rights reserved. 5 - 14 Net Services Administration Pages

15. Copyright © 2007, Oracle. All rights reserved. 5 - 15 Creating a Listener 1 3 4 1 2

16. Copyright © 2007, Oracle. All rights reserved. 5 - 16 Adding Listener Addresses 5 6 7

17. Copyright © 2007, Oracle. All rights reserved. 5 - 17 Database Service Registration

18. Copyright © 2007, Oracle. All rights reserved. 5 - 18 Notes Only

19. Copyright © 2007, Oracle. All rights reserved. 5 - 19 Naming Methods Oracle Net supports several methods of resolving connection information: Easy connect naming: Uses a TCP/IP connect string Local naming: Uses a local configuration file Directory naming: Uses a centralized LDAP-compliant directory server External naming: Uses a supported non-Oracle naming service Client/application server Oracle Net Oracle Net configuration files

20. Copyright © 2007, Oracle. All rights reserved. 5 - 20 Easy Connect Is enabled by default Requires no client-side configuration Supports only TCP/IP (no SSL) Offers no support for advanced connection options such as: –Connect-time failover –Source routing –Load balancing SQL> CONNECT hr/hr@db.us.oracle.com:1521/dba11g No Oracle Net configuration files

21. Copyright © 2007, Oracle. All rights reserved. 5 - 21 Local Naming Requires a client-side Names Resolution file Supports all Oracle Net protocols Supports advanced connection options such as: –Connect-time failover –Source routing –Load balancing SQL> CONNECT hr/hr@orcl Oracle Net configuration files

22. Copyright © 2007, Oracle. All rights reserved. 5 - 22 Directory Naming Requires LDAP with Oracle Net Names Resolution information loaded: –Oracle Internet Directory –Microsoft Active Directory Services Supports all Oracle Net protocols Supports advanced connection options SQL> CONNECT hr/hr@orcl LDAP directory Oracle Net configuration files

23. Copyright © 2007, Oracle. All rights reserved. 5 - 23 External Naming Method Uses a supported non-Oracle naming service Includes: –Network Information Service (NIS) External Naming –Distributed Computing Environment (DCE) Cell Directory Services (CDS) Oracle Net Non-Oracle naming service

24. Copyright © 2007, Oracle. All rights reserved. 5 - 24 Configuring Service Aliases Create or edit

25. Copyright © 2007, Oracle. All rights reserved. 5 - 25 Advanced Connection Options Oracle Net supports the following advanced connection options with local and directory naming: Connect-time failover Load balancing Source routing

26. Copyright © 2007, Oracle. All rights reserved. 5 - 26 Notes Only

27. Copyright © 2007, Oracle. All rights reserved. 5 - 27 Testing Oracle Net Connectivity The tnsping utility that tests Oracle Net service aliases: Ensures connectivity between the client and the Oracle Net Listener Does not verify that the requested service is available Supports Easy Connect Names Resolution: Supports local and directory naming: tnsping db.us.oracle.com:1521/dba11g tnsping orcl

28. Copyright © 2007, Oracle. All rights reserved. 5 - 28 User Sessions: Dedicated Server Server process User sessions Server process Listener

29. Copyright © 2007, Oracle. All rights reserved. 5 - 29 User Sessions: Shared Servers Listener Dispatcher Server process User sessions

30. Copyright © 2007, Oracle. All rights reserved. 5 - 30 SGA Large pool and other memory structures Stack space PGA SGA and PGA Oracle Shared Server: User session data is held in the SGA. Remember to consider shared server memory requirements when sizing the SGA. User session data Cursor state Sort data

31. Copyright © 2007, Oracle. All rights reserved. 5 - 31 Shared Server: Connection Pooling The client application has been idle past the specified time, and an incoming client requests a connection. The maximum number of connections is configured to 255. This client connection is the 256th connection into the server. Connection pooling is turned on so that this connection can be accepted. Database server Idle client Active client New client

32. Copyright © 2007, Oracle. All rights reserved. 5 - 32 When Not to Use a Shared Server Certain types of database work must not be performed using shared servers: Database administration Backup and recovery operations Batch processing and bulk load operations Data warehouse operations DispatcherDedicated server process

33. Copyright © 2007, Oracle. All rights reserved. 5 - 33 Configuring Communication Between Databases Sending data or messages between sites requires network configuration on both sites. You must configure the following: –Network connectivity (for example, TNSNAMES.ora ) –Database links CREATE DATABASE LINK CONNECT TO IDENTIFIED BY USING ' ';

34. Copyright © 2007, Oracle. All rights reserved. 5 - 34 Connecting to Another Database CREATE DATABASE LINK hq.oracle.com CONNECT TO HR IDENTIFIED BY HR USING 'hq'; CONNECT hr/hr@hq SELECT * from HR.employees@hq;employees@hq HQ = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP) (HOST = edtdr8p1.us.oracle.com) (PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl.us.oracle.com) ) tnsnames.ora SQL*Plus

35. Copyright © 2007, Oracle. All rights reserved. 5 - 35 Summary In this lesson, you should have learned how to: Use Enterprise Manager to: –Create additional listeners –Create Oracle Net Service aliases –Configure connect-time failover –Control the Oracle Net Listener Use tnsping to test Oracle Net connectivity Identify when to use shared servers and when to use dedicated servers

36. Copyright © 2007, Oracle. All rights reserved. 5 - 36 Practice 5 Overview: Working with Oracle Network Components This practice covers the following topics: Configuring local Names Resolution to connect to another database Creating a second listener for connect-time failover