By Doug Stuns
-The excellent option to organize for the Oracle9i DBA basics II examination! -Contains examination necessities, real-world situation sidebars, scenario-based questions, and fill-in-the-blank questions. -The CD comprises flashcards, chapter-by-chapter assessments, randomly
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Additional info for OCP: Oracle9i DBA fundamentals II: study guide
Sample text
It is also responsible for managing the Oracle Net buffer contents and passing the buffer information between the client and the server. com The Oracle Net Stack Architecture 21 special features of connection management, such as buffer pooling and multiplexing, if these options are used. The Oracle Protocol Adapters (OPA) Layer The Oracle Protocol Adapters (OPA) layer interfaces with the underlying network. This becomes the entry point into the underlying network. This layer maps the Oracle Net Foundation layer functions to the analogous functions in the underlying protocol.
Each of the layers of the Oracle communications stack has characteristics and responsibilities that are patterned after the OSI model. Oracle interacts with the underlying network at the very highest levels of the OSI model. In essence, it is positioned above the underlying network infrastructure and communicates with the underlying network. Oracle uses Oracle Net on the client and server to facilitate communications. The communications stack functions as a conduit to share and manage data between the client and server.
Check Point Software Technologies and Cisco are examples of vendors that market proxy-based firewalls. Oracle works closely with the vendors of both types of product to ensure support of database traffic through these types of mechanism. Oracle supplies the Oracle Net Application Proxy Kit to the vendors of firewalls. This product can be incorporated into the firewall architecture to allow database packets to pass through the firewall and still maintain a high degree of security. Know Thy Firewall It is important to understand your network infrastructure, the network routes you are using to obtain database connections, and the type of firewall products you are using.