TAILIEUCHUNG - OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P7

OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P7:There is an ever increasing demand for staff with IT industry certification. The benefits to employers are significant—they can be certain that staff have a certain level of competence—and the benefits to the individuals, in terms of demand for their services, are equally great. Many employers are now requiring technical staff to have certifications, and many IT purchasers will not buy from firms that do not have certified staff. | OCA OCP Oracle Database 11g All-in-One Exam Guide 16 Client-side components Server-side components Figure 1-4 The indirect connection between a user and a database Figure 1-4 represents this graphically. It is absolutely impossible for any client-side process to have any contact with the database all access must be mediated by server-side processes. The client-server split is between the user process which generates SQL and the server process which executes it. Distributed Systems Architectures In the single-instance environment one instance opens one database. In a distributed environment there are various possibilities for grouping instances and databases. Principally Real Application Clusters RAC where multiple instances open one database Streams where multiple Oracle servers propagate transactions between each other Dataguard where a primary database updates a standby database Combinations of these options can result in a system that can achieve the goals of 100 percent uptime and no data loss with limitless scalability and performance. Real Application Clusters RAC RAC provides amazing capabilities for performance fault tolerance and scalability and possibly cost savings and is integral to the Oracle s concept of the Grid. With previous releases RAC or its precursor Oracle Parallel Server was an expensive addon option but from database release 10g onward RAC is bundled with the Standard Edition license. This is an indication of how much Oracle Corporation wants to push users toward the RAC environment. Standard Edition RAC is limited to a certain number of computers and a certain number of CPUs and cores per computer but Chapter 1 Architectural Overview of Oracle Database 11g 17 even within these limitations it gives access to a phenomenally powerful environment. RAC is an extra-cost option for the Enterprise Edition where the scalability becomes effectively limitless bounded only by the clustering capacity of the underlying operating system and hardware. A .

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