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Availability Ensuring a database is available when required is a fundamental DBA responsibility, and in this regard, SQL Server 2008 includes a number of high-availability solutions, including failover clustering, database mirroring, and transaction log shipping, each of which we ll cover in this book. We ll also examine the importance of service level agreements in a high-availability plan, and learn how to design redundancy into server components. Reliability Unexpected performance and corruption problems not only disappoint users, but they also lead to long, chaotic, and reactive working days for a DBA. Throughout this book, we ll cover a number of proactive maintenance and design practices, such as using the SQLIOSIM utility to validate a storage system, and using Database Console Commands (DBCC) to validate the integrity of a database. Recoverability Of course, should disaster strike, a DBA needs to spring into action with a plan of attack for restoring a database as quickly as possible, and in chapter 10, we ll cover this process in detail. Ensuring databases are secure, available, reliable, and recoverable are core DBA responsibilities. In subsequent chapters, we ll drill down into each of these responsibilities in more detail, beginning with the next chapter, in which we focus on the important topic of sizing a storage system.

the nature of the specialized positions in operations Operations personnel may have to learn to operate a new machine that replaces the one with which they are familiar Flexibility is, therefore, important in operations jobs The use of personal computers and networks has had a large impact on the specialized jobs associated with the large computers The keys to success and continued employment in operations are the development of transferable skills, a willingness to develop new skills that keep pace with technological changes, and an eye to the future Jobs in operations vary quite a bit in function, yet movement from one area to another is common because of the limited training required for each position Within computer operations, production control, and data entry are various levels to which employees can advance as their careers develop Supervisors normally work their way up through the ranks However, today, those promoted to manager of operations usually have a good deal more formal education and experience than do most operations workers because these individuals must work closely with such highly trained individuals as the network managers, database administrators, managers of systems analysis, and managers of programming In charge of computer operations, data entry, and production control, the manager of operations must plan, direct, and control all computer and peripheral equipment operations, data entry, and production control activities In some centers, the manager also is responsible for operating systems programming, software maintenance, or applications maintenance programming Because of the increased hardware and software complexity, the position is being continually upgraded As the individual responsible for computer operations throughout the organization, the manager must have a broad knowledge of the company and be able to communicate with managers at all levels and across all departments Minimum requirements for the position include supervisory operations experience and a good knowledge of installed hardware, software, and operating systems In large installations, a college degree is required As in every other area, a premium is placed on experience in network technology, telecommunications, and databases The positions held by operations personnel are shown in Figure 41 As can be seen, the manager of operations has a number of different section managers or supervisors reporting to him or her Remember that this structure may vary from one organization to another, but these positions do exist in most medium and large installations.

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Characterizing I/O load Determining the required number of disks Selecting RAID levels and storage systems Tuning storage area networks Evaluating solid-state disks

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