Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 1 Chapter 13 Network Administration and Server-side Configuration

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 2 Chapter Objectives Identify the different types of architecture available in an Oracle network environment Identify the components available within Oracle Net Services Identify features of the Oracle Connection Manager

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 3 Chapter Objectives (Cont.) Specify the purpose of each layer in the Oracle communications stack State the purpose of a listener Create, configure, and delete a listener

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 4 Networking Overview Group of devices connected through a transmission medium Requires modem or network interface card (NIC) Transmission medium: telephone wire (twisted pair wire), coaxial cable, fiber optics, microwave, laser

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 5 Basic Network

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 6 Layered Architecture Single-tier Mainframe computer with dumb terminals Two-tier Client/server environment N-tier Various servers used to handle different parts of a task: Web, , or application servers

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 7 Single-tier Architecture

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 8 Two-tier Architecture

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 9 N-tier Architecture

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 10 Architecture Implementation Addresses four issues: –Connectivity –Manageability –Scalability –Security

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 11 Oracle Net Services Addresses connectivity, manageability, and scalability issues Composed of: –Oracle Net –Oracle Net Listener –Oracle Connection Manager –Networking Tools

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 12 Oracle Advanced Security Purchased separately from Database software Supports: –Data encryption Standard DES Triple DES RSA RC4 –User Authentication –Single sign-on

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 13 Oracle Communications Stack

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 14 Communication Stack for Web Client Connections

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 15 Server Configuration Client contacts server through a listener Each database must have at least one listener Default name: LISTENER

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 16 Listener Configuration Configure listener: –Net Manager –Net Configuration Assistant –Manually with text editor Listener parameters stored in LISTENER.ORA file

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 17 LISTENER.ORA File

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 18 Listener Control Utility Command-line interface LSNRCTL command launches utility Use HELP to view available commands Commands affect LISTENER by default

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 19 Listener Control Utility Interface

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 20 Listener Parameters

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 21 Dynamic Registration PMON registers with default listener INSTANCE_NAME and SERVICE_NAMES must be configured SERVICE_NAMES includes DB_DOMAIN value and instance name

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 22 Chapter Summary A single-tier architecture consists of a dumb terminal directly connected to a mainframe computer. A two-tier architecture consists of clients connecting to a server over a network with the processing burden being shared between the client and server. An n-tier architecture includes middleware between the client and database server tier, such as a server that can be used to multiplex client connections or function as a Web server.

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 23 Chapter Summary (Cont.) Components of Oracle Net Services address the connectivity, manageability, and scalability of the Oracle9i network environment. Oracle Net Services includes Oracle Net, Oracle Net Listener, Oracle Connection Manager, and Networking Tools. Oracle Connection Manager can be used to multiplex client connections and to block or allow access from different clients and protocol conversion.

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 24 Chapter Summary (Cont.) Oracle Advanced Server Security is a separately licensed product that provides support for data encryption and user authentication. The Oracle communications stack is based on the OSI model and provides the specifications for transmitting data across an Oracle network environment. Each database must have at least one listener configured to respond to client requests.

Chapter 13Oracle9i DBA II: Backup/Recovery and Network Administration 25 Chapter Summary (Cont.) A database listener can be configured when the database is created through Net Manager or through the Net Configuration Assistant. Operations such as starting, stopping, and reloading a listener can be performed through the Listener control utility (lsnrctl). The Net Manager can be used to change the configuration for a listener, delete a listener, or add a listener.