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In addition to the automatic database management features, Oracle Database 11g offers you opportunities to perform many common tasks online, thus reducing the work that you would otherwise perform only after the database was shut down or an object was taken offline. In some cases (such as the MOVE command), DML operations are prevented until the table is moved. These features offer you continuous online availability, making it easier for you to perform the reorganization tasks. In the sections that follow, you ll examine some of the important online capabilities of the Oracle Database 11g database.

Oracle provided several online reorganization features, such as the ability to create partitions, move tables, and add constraints, in older versions of its software. The Oracle Database 11g version goes much further and provides more online options for DBAs, including online database reorganization, object validation, and index rebuilding.

You can easily perform offline or online reorganization of database objects using the OEM Database Control. Often you ll see a need to change the storage attributes of a table or an index, and the Database Control makes it easy to perform these reorganizations. To perform database reorganization with the Database Control, go to the Database Control home page and choose Administration Reorganize Objects. Figure 17-8 shows the main page of the Database Control Data Reorganization feature. You can choose either offline or online reorganization. Online reorganization is slower, but it provides access to the objects being reorganized. Once you choose the online reorganization method, OEM will ask you for the list of objects to be reorganized. It then generates an impact report and job summary, which is a summary of the actual reorganization script. In the next step, you decide whether to perform the online reorganization right away or to schedule it for some other time.

Symmetric Algorithms Although the relationship is-the-inverse-of is not generally commutative, there is a subset of inverse algorithms in which the relationship is commutative. I ll call these algorithms symmetric algorithms, not to be confused with symmetric key algorithms used in cryptography, which use the same key to encrypt and decrypt data. If F has an inverse algorithm G, then G is also the symmetric of F if F is the inverse of G. The following definition might be easier to digest:

Several UNIX operating systems have their own system-monitoring tools. For example, on the HP-UX operating system, GlancePlus is a package that is commonly used by system administrators and DBAs to monitor memory, disk I/O, and CPU performance.

Figure 3-3 shows a typical GlancePlus session in text mode, invoked with the following command: $ glance -m The CPU, memory, disk, and swap usage is summarized in the top section. The middle of the display gives you a detailed memory report, and at the bottom of the screen you can see a short summary of memory usage again.

Figure 3-3. A typical GlancePlus session in text mode Note that this session shows memory usage in detail because GlancePlus was invoked with the -m option (glance -c would give you a report on CPU usage, and glance -d would give you a disk usage report). GlancePlus also has an attractive and highly useful GUI interface, which you can invoke by using the command gpm.

Figure 5-24. Using routers to bridge the Internet Any number of intermediate routers may be involved in the client-to-server path. The router closest to the client is called a ClientRouter; the router closest to the server is called a TargetRouter. A ClientRouter exposes a custom interface to its client and acts as a proxy. Clients interact with the ClientRouter as if it were the actual server. On the other end, servers interact with the TargetRouter as if it were the actual client. Intermediate routers talk to other routers using a standard set of interfaces.

Besides monitoring the CPU and memory on the system, you need to monitor the network to make sure there are no serious traffic bottlenecks. The netstat utility comes in handy for this purpose, and it works the same way on UNIX as it does on the Windows servers.