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The Exadata Smart Flash Cache uses flash-based storage to improve the retrieval performance for commonly used data, and Exadata software makes intelligent choices to determine what type of data can provide the biggest benefit from being stored in the flash cache I/O Resource Manager provides a way to provision I/O bandwidth among different groups of users I/O Resource Manager can provision I/O operations within a single database, between databases, or between categories of databases This chapter closed with an overview of Exadata software used to interact with the Exadata Storage Servers for management as well as monitoring The next chapter will cover the hardware components of the Oracle Exadata Database Machine
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arlier in the book, we described how computer platforms evolved from systems consisting of tightly integrated servers, storage, and databases to systems assembled from components provided by multiple vendors We also described how tightly integrated hardware and database solutions from single vendors are becoming popular again now that cost and complexity of integration of these components and the trade-offs in performance are realized Now, we ll describe the pre-integrated system and prebalanced hardware platform that is the Oracle Exadata Database Machine product We ll begin by describing how system performance is optimized in hardware and how the components come together in the packaging of the Database Machine We ll also take a look at how those components evolved in the Database Machine and how this evolution could affect your upgrade strategy We ll then describe how the Oracle Exadata Database Machine is linked to the outside world for communications and how it is connected to other devices Last, we ll cover high availability characteristics built into the hardware We do not intend to provide you with a recipe for building your own look-alike Database Machine from components in this chapter The amount and complexity of the testing and integration of the Sun hardware and Oracle software required to deliver an Oracle Exadata Database Machine makes duplicating that effort a losing proposition Whatever you might gain in cost savings by acquiring components separately is lost in the time and expense of testing and validating hardware and software components and in the time to delivery of a complete business solution To make matters worse, Oracle is not able to support the Oracle Exadata Server Software for custombuilt configurations However, the information provided in this chapter should give you a fundamental understanding of how the Oracle Exadata Database Machine should be planned for, deployed, and upgraded within the technical architecture of your company or organization Finally, as you learned in the previous chapter, merely assembling hardware components leaves out the essential component of Exadata software, which provides unique advantages to the Database Machine
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Before we get into the specifics of the Oracle Exadata Database Machine, let s review some computer hardware basics to better understand the impact of server and storage components in enabling optimal performance
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Great performance occurs when a system is well balanced such that it can deliver the needed volume of data residing in storage to fully use the processing power of the CPUs which, in turn, return results to the business users in time for them to make decisions Balancing large storage volumes, speedy and powerful processors, and adequate throughput is fundamental to the design of an optimal system Of course, selection of all of these components by your platform vendor must also include having an eye on the pricing of the components and of the overall system that is assembled Since the evolution of key system components proceeds at different rates over time, maintaining a balanced system over that system s lifetime presents its own set of challenges The Oracle Exadata Database Machine holds a reputation for delivering such a balanced system, dating from the platform s introduction through its subsequent iterations We ll next explore how the components work together as an optimal system and will consider the roles of the Intel-based CPUs, memory, InfiniBand interconnect, and flash and disk storage technologies in the Database Machine
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