January 2007
Intermediate to advanced
190 pages
3h 47m
English
Content preview from The Oracle® Hacker's Handbook: Hacking and Defending Oracle
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Chapter 2. The Oracle Network Architecture
The Oracle network architecture encompasses many components — all of which neatly corresponds to the OSI networking model (see Figure 2-1). This architecture enables Oracle client and server applications to transparently communicate over protocols such as TCP/IP. The session protocol that interfaces between the applications (Oracle Call Interface, or OCI, on the client and Oracle Program Interface, or OPI, on the server) and the network layer is known as Net8 (Net9), and before that SQL*Net. Between the OCI/OPI and Net8 layer is a presentation protocol called Two-Task Common (TTC) that is responsible for character set and data type conversion differences between the client and the server. The Net8 session protocol has three components — the Net Foundation and Routing/Naming/Auth and TNS — the last two making up Protocol Support. Supported transport protocols include TCP/IP, with or without TCP, Named Pipes and Sockets Direct Protocol (SDP), which enables communication over Infiband high-speed networks. Underpinning all of this is the Transparent Network Substrate protocol, also known as TNS. The task of TNS is to select the Oracle Protocol Adapter, wrapping the communication in one of the supported transport protocols.
Figure 2-1. The OSI networking model
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