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Filtering can be quite expensive computationally. In EBSs that support large numbers of subscribers or complex filtering, a dedicated system can perform filtering, as shown in Figure 2-15.

Oracle will format the operating system files and allocate them to the tablespaces when you specify a datafile size and a fully specified filename during tablespace creation..

Every application goes through changes over time to improve features and fix bugs in the software. There is a constant cycle of development, testing, and implementation, and the DBA plays an important role in that cycle. Change management is the process of properly migrating new code, and the Oracle DBA needs to understand the process that s in place in his or her organization. In addition to updating application code, the Oracle DBA is also responsible for ensuring that all the latest changes to the database software are also evaluated and adopted. These so-called software patches are usually made available through Oracle s MetaLink service. In fact, the latest Oracle Enterprise Manager (OEM) enables you to connect directly to MetaLink and download and apply software patches. In Oracle Database 11g, you can use two new change management features, Database Replay and SQL Performance Analyzer, to find out ahead of time the impact of system changes, including a database or server upgrade, on SQL and database performance. I discuss both of these important features in 20.

Figure 2-15. Using a dedicated system to channelize and filter notifications To reduce the loading of the channelizing/filtering service, you can use a separate system to split notifications into channels, as shown in Figure 2-16.

Many Oracle DBAs spend at least part of their time helping design new databases. The DBA s role may include helping create entity-relationship diagrams and suggesting dependencies and candidates for primary keys. In fact, having the DBA actively involved in designing new databases will improve the performance of the databases down the road. It s a well-known fact that an improperly designed database thwarts all attempts to tune its performance.

Although designing databases is probably not the first thing that comes to mind when you think of a DBA s responsibilities, design issues (whether concerning the initial design or design change) are a fundamental part of the Oracle DBA s job. Administrators who are particularly skilled in the logical design of databases can be crucial members of a team that s designing and building brand-new databases. A talented DBA can keep the design team from making poor choices during the design process.

The Oracle DBA plays an important role in evaluating the features of alternative products. The DBA is the person who installs the Oracle database server software in most organizations; the UNIX system administrator may also handle part of the installation process. Prior to actual installation, the DBA is responsible for listing all the memory and disk requirements so that the Oracle software and databases, as well as the system itself, can perform adequately. If the DBA wants the system administrator to reconfigure the UNIX kernel so it can support the Oracle installation, the DBA is responsible for providing the necessary information. Besides installing the Oracle database server software, the DBA is also called upon to install any middleware, such as the Oracle Application Server and Oracle client software on client machines.

Channels Events Event Publisher All Notifications Notification Channelizer Notification Filter Channels with Filtered Notifications

The DBA is responsible for the creation of databases. Initially he or she may create a test database and later, after satisfactory testing, move the database to a production version. The DBA plans the logical design of the database structures, such as tablespaces, and implements the design by creating the structures after the database is created. As the DBA plays a part in creating the new database, he or she needs to work with the application team closely to come up with proper estimates of the database objects, such as tables and indexes.