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For an Oracle DBA, no task is more fundamental and critical than protecting the database itself. The Oracle DBA is the person the information departments entrust with safeguarding the organization s data, and this involves preventing unauthorized use of and access to the database. The DBA has several means to ensure the database s security, and based on the company s security guidelines, he or she needs to maintain the database security policy (and to create the policy if it doesn t already exist). A more complex issue is the authorization of users actions within the database itself, after access has already been granted. I address this topic in depth in 12.
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Note Some organizations don t have a general security policy in place. This is particularly true of smaller companies. In that case, it s usually up to the DBA to come up with the security policy and then enforce it within the database.
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Creating and Managing Users
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Every database has users, and it s the DBA s job to create them based on requests from the appropriate people. A DBA is expected to guide the users use of the database and ensure the database s security by using proper authorization schemes, roles, and privileges. Of course, when users are locked out of the database because of password expiration and related issues, the DBA needs to take care of them. It s also the responsibility of the DBA to monitor the resource usage by individual users and to flag the heavy resource users.
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CHAPTER 1 THE ORA CLE DBA S WORLD
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The DBA s System Management Role
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Another of the DBA s major roles is the day-to-day management of the database and its subsystems. This daily monitoring is not limited to the database itself. As a DBA, you need to be aware of how the system as a whole is performing. You need to monitor the performance of the servers that host the database and of the network that enables connections to the database. The following sections describe the various facets of the system management part of the Oracle DBA s job.
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Troubleshooting
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One of the Oracle DBA s main job responsibilities is troubleshooting the database to fix problems. Troubleshooting is a catchall term, and it can involve several of the tasks I discuss in the following sections. Two important aspects of troubleshooting are knowing how to get the right kind of help from Oracle support personnel, and how to use other Oracle resources to fix problems quickly.
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Performance Tuning
Performance tuning is an omnipresent issue. It s a part of the design stage, the implementation stage, the testing stage, and the production stage of a database. In fact, performance tuning is an ongoing task that constantly requires the attention of a good Oracle DBA. Depending on the organizational setup, the DBA may need to perform database tuning, or application tuning, or both. Generally, the DBA performs the database tuning and assists in the testing and implementation stages of the application tuning performed by the application developers. Performance requirements for a living database change constantly, and the DBA needs to continually monitor the database performance by applying the right indicators. For example, after migrating to a newer release of the Oracle database, I found that several large batch programs weren t completing within the allotted time. After much frustration, I realized that this was because some of the code was using cost-based optimizer hints that were no longer optimal under the new Oracle version. A quick revision of those hints improved the performance of the programs dramatically. The moral of the story: make sure you test all the code under the new Oracle version before you switch over to it. You can say that all database tuning efforts can be grouped into two classes proactive and reactive tuning. Proactive tuning, as the name indicates, means that the DBA heads off potential trouble by careful monitoring of necessary performance indices. As we all know, prevention is always better than any cure, so proactive tuning will always trump reactive tuning efforts. However, most Oracle DBAs in charge of production databases don t have the luxury of proactively tuning they are too busy reacting to complaints about a slow-performing database or some similar problem. You are likely to encounter both kinds of database tuning efforts in your day-to-day life as an Oracle DBA.
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