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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 RAC database can be configured for 100 percent uptime One instance can be brought down (either for planned maintenance, or perhaps because the computer on which it is running crashes) and the database will remain accessible through a surviving instance on another machine Sessions against the failed instance can be reestablished against a surviving instance without the end user being aware of any disruption Transparent scalability comes from the ability to add instances, running on different machines, to a RAC dynamically They will automatically take on some of the workload without users needing to be aware of the fact that now more instances are available Some applications will have a performance benefit from running on a RAC Parallel processing can improve the performance of some work, such as long-running queries and large batch updates In a single-instance database, assigning multiple parallel execution servers to such jobs will help but they will all be running in one instance on one machine In a RAC database, the parallel execution servers can run on different instances, which may get around some of the bottlenecks inherent in singleinstance architecture Other work, such as processing the large number of small transactions typically found in an OLTP system, will not gain a performance benefit TIP Don t convert to RAC just because you canYou need to be certain of what you want to achieve before embarking on what is a major exercise that may not be necessary PART I

There are various circumstances that make it desirable to transfer data from one database to another Fault tolerance is one: if an organization has two (or more) geographically separated databases, both containing identical data and both available at all times for users to work on, then no matter what goes wrong at one site, work should be able to continue uninterrupted at the other Another reason is tuning: the two databases can be configured for different types of work, such as a transaction processing database and a data warehouse Keeping the databases synchronized will have to be completely automatic, and all changes made at either site will need to be propagated in real or near-real time to the other site Another reason could be maintenance of a data warehouse Data sets maintained by an OLTP database will need to be propagated to the warehouse database, and subsequently these copies will need to be periodically refreshed with changes The data might then be pushed further out, perhaps to a series of data marts, each with a subset of the warehouse Streams is a facility for capturing changes made to tables and applying them to remote copies of the tables

On pourrait faire du shopping oh poo-ray fer dU shop-peeng On pourrait aller d ner oh poo-ray ta-lay dee-nay On pourrait aller une exposition We could go to an exhibit oh poo-ray ta-lay a un eks-po-zee-syoh We could go out for dinner We could go shopping

To determine the appropriate resolution at which you should capture images, consider the following tips: If you re a designer working with images that will ultimately be displayed on the printed page using a halftone printer (such as one that produces color separations for four-color process printing), scan at 15 to 2 times larger than the printer s screen frequency or line screen (lines per inch = lpi) (See Table 3-5 for common screen frequencies, but check with your printer to be sure) If you re working with images that will be printed using an ink-jet printer, you don t have to use as high a resolution, because ink-jet printers tend to bleed the color across the page This causes those tiny dots to blend together and reduce the speckled appearance of low-resolution images In fact, scanning at 150 dpi is usually sufficient when a file will only be printed on an ink-jet printer If you re working with images that you plan to use only on a web site, I recommend you capture them at 150 dpi, even though you ll probably downsample them to 72 dpi for the final web page The reason I recommend this is that it offers you a higher-quality file with larger pixel dimensions meaning you can use it at a larger size in your design if needed, and you can also downsample it later to actually increase the quality of the image If you re using a digital camera to capture images, consider using the highest quality setting on the camera if your storage method allows you to Even though you may not think you ll need to use the file at such a high resolution, you re better off having a copy at the higher resolution if you need it later, given that you can t rescan a picture taken with a digital camera.