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Chapter 3: Networking and Database AvailabilityIn this chapter, you will cover the following topics related to Oracle networking and database availability:
- Oracle networking and OEM configuration
- Startup and shutdown of Oracle databases
Oracle Networking and OEM Configuration
This section covers the following topics on Oracle networking and OEM configuration:
- Purpose and structure of Net8
- Net8 files for configuration
- Generating Net8 files with Net8 Assistant
- Creating the OEM repository
- Using OEM console navigator
Purpose and Structure of Net8
Whatever your network, Net8 can help you connect your users to the Oracle database. There are versions of Net8 that run on TCP/IP, DECnet, IPX, and many other LAN or WAN products. Moreover, it is possible for Net8 to handle users on multiple networks attempting to connect to the same Oracle database. Networked computing has seen three distinct trends in the last 40 years of organizational use of computers:
- Mainframe computing Paradigm that uses mainframe computers to solve business problems. Mainframes feature powerful processing capacity at high speeds but have the drawbacks of unwieldy interfaces, complex programming, and inflexibility for changing business requirements.
- Client/server computing Paradigm that uses personal computers and servers, each running their own software, to solve business problems. Advantages include great looking user interfaces and flexibility for changing business needs, but has the drawback of slow operation and distributed data storage that require synchronization activity to guarantee data reliability.
- Internet computing Paradigm that uses servers and personal computers, each running their own software, to solve business problems. The differentiating characteristic of PC software in this case is the use of Web browser technology as a universal client. Advantages include centralized storage of data, fast user processing times, great looking user interfaces, and simplified choice process for client software. Disadvantages include security (perceived or real) and dependence on network availabi I ity for operation.
Net8 is Oracle's networking software that allows both Internet computing and client/server architecture to be used in your database applications. The key component of Net8 includes database name and location resolution, locally or with an Oracle Names server. Net8 does not, however, do any hostname resolution. The resolution of a name you have given to a server to its network IP address; Net8 counts on the underlying network to handle that. Thus, Net8's basic purpose includes communication of user requests from client to server. Note the use of communication-not transportin that description. Net8 is not a stand-alone networking protocol. In other words, if you aren't using TCP/IP, DECnet, IPX, or some other networking protocol already, Net8 alone won't make all your computers magically start talking to one another. Net8 simply runs over the top of an existing network to make all the Oracle-related components talk to each other, using something called the Transparent Network Substrate, or TNS, to form ,,connections between clients and servers. TNS allows Net8 to communicate with...