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Oracle Corp., like the other software vendors, releases periodic patches or patch sets, which are a set of fixes for bugs discovered by either Oracle or its customers. When you get in touch with Oracle technical support, one of the things the technical support representative will commonly ask you to do is make sure you have applied the latest patch set to your Oracle software. Similarly, UNIX operating systems may have their own patch sets that you may have to apply to fix certain bugs. Each of Oracle s patch sets could cover fixes for literally hundreds of bugs. My recommendation is to apply a patch set as soon as it s available. One of the primary reasons for this is to see whether your bug is unique to your database or if a general solution has already been found for the problem. When you ask Oracle technical support to resolve a major problem caused by a bug, Oracle usually provides you with a workaround. Oracle recommends that you upgrade your database to the latest versions and patch sets because some Oracle bugs may not have any workarounds or fixes. Oracle will continue to support older versions of its server software throughout their support life cycle, which is usually about two to three years after the next major release. Many organizations see no urgency to move to newer versions, as Oracle continues to support the older versions after the release of the new versions. The question regarding how quickly you should convert to a new version is somewhat tricky to answer. Traditionally, people have shied away from being early adopters of new Oracle software versions. Oracle, like most other software companies, has a reputation for buggy initial releases of its major software versions. DBAs and managers in general prefer to wait a while until a stable version comes out. Although the logic behind this approach is understandable, you must also figure in the cost of not being able to use the many powerful features Oracle introduces in each of its major releases. Because nobody likes to jeopardize the performance of a production system, the ideal solution is to maintain a test server where the new software is tested thoroughly before being moved into production as early as possible. However, don t wait forever to move to a new version by the time some companies move to the new version, an even newer Oracle version is already out! Some of your good SQL statements may not be so good after you migrate to a new version, due to the way a hint might behave in the new version, for example. That s why it s extremely important to test the whole system on the new version before cutting over production systems. A smart strategy is to collect a set of performance statistics that can serve as a baseline before you make any major changes in the system. These system changes may include the following: Migrating or upgrading a database Applying a new database or operating system patch set Adding a new application to your database Substantially increasing the user population
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Traditionally, Oracle DBAs relied heavily on the use of dynamic performance views (V$ views) to gather performance statistics and diagnose instance performance problems. You have access to all the traditional views in Oracle Database 11g. However, you now also have powerful automatic performance tuning features that provide a faster and more painless way to approach instance performance tuning. Most of these tools use the same V$ dynamic performance views that you use in manual performance tuning. Although I provide several examples of manual performance tuning in this chapter, I must emphasize the importance of understanding and using the powerful set of
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