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RAC does offer linear scalability, in that adding a node to a two-node cluster will increase the horsepower by about 50 percent, or adding a node to a three-node cluster will add 33 percent to the overall power of the cluster Don t mistake this type of linear scalability for perfect scalability, in that a two-node cluster will not produce 200 percent of the throughput of a single-node server However, you will not find decreasing efficiency as you add more nodes to the cluster, crucial to the use of larger clusters The scalability of RAC has significant implications for your database budget With a single database server, you would typically size the server to handle not only today s demands; instead, you will size the server to handle the anticipated load a couple of years in the future to avoid the overhead of a server upgrade too soon This approach means that you will end up buying more servers than you need, increasing cost and forcing excess server capacity in the initial stages With RAC, you can simply buy the number of nodes you need to handle your near-term requirements When you need more power, you just buy more servers and add them to the cluster Even better, you can buy smaller commodity servers, which are significantly less expensive than larger machines And to top it all off, the server you buy in nine months will give you more power for your money than a similar server today All of these benefits are part of the common Oracle liturgy, but there is one other advantage that RAC scalability provides Even experienced administrators are frequently wrong when they try to estimate the requirements for a database server two years out If they overestimate future needs, their organizations end up buying excess hardware and software the lesser of two evils If they underestimate, they will find themselves having to upgrade their database server early, because the database services it provides are more popular than they expected So the upgrade, with its concomitant overhead and downtime, affects a popular service With RAC, you are never wrong You won t overestimate, since you will plan on buying more servers when you need them, whether that is in nine months or five years And you won t be plagued by the penalties associated with underestimation.

The thought police of the church held less power in northern Europe than they did in Italy Proponents of the heliocentric (Sun-centered) theory were taken seriously in places such as Germany, France, Poland, and England

Up to this point, we have been looking at RAC from a fairly high level You could be forgiven for not appreciating the sophistication of RAC technology The really interesting part comes when you understand that the instances

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Nicolaus Copernicus, a Polish astronomer, published a work in the early sixteenth century suggesting that the Sun, not the Earth, must be at the center of the Universe (Remember that back in the sixteenth century the Earth, the Moon, the Sun, and the planets basically defined the entire Cosmos No

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one knew what the stars were, much less how they were distributed throughout space) The Earth, thought Copernicus, is a planet just like Mercury, Venus, or Mars insofar as its importance in the overall scheme of things But Copernicus could not prove his theory to the complete satisfaction of the authorities in his part of the world If the Earth is moving, asked the skeptics, why don t we feel a constant wind from space What force could push the Earth Why should such a force exist Another astronomer, Tycho Brahe, was involved with an ongoing meticulous mapping and recording job He kept careful records of the positions of all the planets over a period of time Brahe had a German assistant named Johannes Kepler who eventually formulated the three fundamental rules for planetary motion, known as Kepler s laws Isaac Newton put it all together and finally changed mainstream thinking The Earth had lost its exalted position, replaced by the Sun The heliocentric theory had survived the test of time and had become the conventional wisdom

spread across multiple nodes are not just sharing data they are also sharing their data caches, which is the key to the performance offered by RAC The diagram shown in Figure 2-5 is a slight expansion of the architecture shown in Figure 2-4 The difference is that you can now see the shared cache, implemented by technology known as Cache Fusion Although all instances share the same database files, each instance in a RAC database, since it is located on physically separate servers, must have its own separate memory cache Normally, this separation could lead to all kinds of inefficiencies, as data blocks were cached in the data buffers of multiple machines Part of the RAC architecture is an interconnect, which links caches on separate servers together and allows transfers directly between different memory caches This architecture allows the database cache to grow as more nodes are added to a cluster When a SQL operation looks for a data block, the instance looks first in its own database buffers If the block is not found in those buffers, the instance asks the cluster management service if the block exists in the buffer of another instance If that block does exist in another instance, the block is transferred directly over the interconnect to the buffers of the requesting node

You can pin any of the auxiliary windows in place, keeping them visible, by clicking the pushpin icon in the title bar of the window. When unpinned, they will auto-hide, showing only their tab. Clicking on a tab while unpinned will make them temporarily visible.

Johannes Kepler published his famous rules of planetary motion early in the seventeenth century They can be stated briefly as follows:

FIGURE 2-5

Sun at one focus, and equal areas (X) are swept out in equal periods of time (t)

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