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What does it mean to be a DBA
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log shipping, clustering, database mirroring, and other technologies. Because of the specialized knowledge required for high availability techniques, many DBAs choose this as their main area of focus.
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INSTALLING, CONFIGURING, AND UPGRADING SQL SERVER SOFTWARE
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One of the most time-consuming of all database tasks is installing, configuring, patching, and upgrading SQL Server instances. Although it might sound like an easy task, it usually isn t. One of the difficulties is finding a good time to perform such work, especially in 24/7 shops. In addition, each time SQL Server is patched or upgraded, there is the risk that after the patch or upgrade the applications that access the database, or the databases themselves, might not work properly. On top of this, DBAs often have to battle third-party vendors who are unwilling to certify that their application will work after you have made the changes. This requires the completion of planning, testing, and backout preparation before implementing major changes.
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Over time, the load put on individual databases changes. DBAs are responsible for monitoring workloads and figuring out how to maximize hardware resources to get the best SQL Server performance. This may involve moving a database from a heavily loaded server to a server with a lighter load. SQL Server virtualization, and how it can benefit load balancing, is becoming a hot topic for many DBAs. For more information on SQL Server virtualization, see chapter 39, Running SQL Server on Hyper-V, by John Paul Cook.
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Writing and maintaining documentation is probably the most boring and loathed task that a DBA will encounter. However boring, it is a critical part of the DBA s job. If you don t document, then there is no easy way to rebuild the current infrastructure should major problems arise.
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MANAGING PEOPLE Many DBAs find themselves in management positions, such as a senior DBA in charge of junior DBAs. Some DBAs at large organizations do this full time, whereas others
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combine people management with other DBA duties. On the other hand, when some DBAs get a taste of management, they give it up to get back to more technical work. Managing people is not for everyone.
MANAGING SQL SERVER BASED APPLICATIONS A surprise for many new DBAs is the realization that they are responsible not only for managing SQL Server and its databases, but in many organizations, they are also
responsible for managing any applications that access the database. In some organizations, the DBA spends more time managing applications than SQL Server itself.
MANAGING TEST ENVIRONMENTS In many organizations, DBAs manage test environments that not only include test SQL
Servers and test databases, but also test applications. The purpose of this is to allow applications (both in-house and third-party) to be tested before new versions of either the application or SQL Server are rolled out into production.
Typical DBA tasks: A to Z MENTORING
Oftentimes, DBAs have to share their knowledge with other DBAs, developers, or end users. This might be informal one-on-one tutoring, or it might include classroom training.
MONITORING
This is a wide-ranging task that includes multiple subtasks, such as performance monitoring, monitoring server disk space, viewing logs, ensuring jobs have run successfully, and scrutinizing for errors. Although a variety of third-party tools are available to perform these tasks, DBAs commonly spend a lot of time performing monitoring manually because they don t have a budget for such tools, or they are not familiar with them.
NEEDS AND REQUIREMENTS ANALYSIS Whether DBAs are involved in development, or just supporting third-party applica-
tions, they often get involved in needs and requirements analysis. This can include talking to users, finding out their needs and requirements, and determining the best way to meet them. This often includes researching available third-party solutions and determining if it s best to develop the application in-house, or to invest in a third-party application.
NEGOTIATING SERVICE LEVEL AGREEMENTS In many organizations, DBAs become involved in negotiating service level agreements (SLAs). An SLA is an agreement between parties in which one is the customer and the
other is the service provider. The customer (the owner of the business application accessing SQL Server databases) and the DBA (the service provider), must agree on acceptable levels of service, such as defining what is an acceptable response time for a specific type of transaction. Part of the negotiating process often requires the DBA to set expectations and educate the customer on what is feasible given the resource constraints of the organization.
OPERATING SYSTEM SETUP, CONFIGURATION, AND ADMINISTRATION Just as many DBAs manage their own hardware, many DBAs also manage the operating system on their SQL Server instances. Not only must SQL Server be configured opti-
mally, the operating system it is running on must also be configured optimally, and be properly maintained.
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