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Once installation is complete on a system and the configuration is optimal, the DBA is also responsible for day-to-day operations, maintaining data integrity, and making sure that there is a level of recoverability for the data in the event of a severe hardware problem or other disaster.
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It is commonly recognized that backup and restore operations are the most crucial tasks that the DBA performs. As a DBA, it is your responsibility to ensure that all databases are backed up on a regular basis to allow for a restore should there be a major problem. There are different kinds of backups: full, differential, partial, and transaction log, as described in 14, Backup Fundamentals. Each one of these can be used depending upon the level of recovery required for the data on the server. With SQL Server 2005, you can also password protect a backup to prevent unauthorized restores. Backup procedures in themselves are quite simple to master; however, frequent tests of backups can help you greatly down the road. Similarly, testing restores of these backups is very important. After all, what good is a backup if you can never restore it Test all kinds of restores that you might encounter, and test them frequently by performing those restores to a backup system. If you do so, you will be prepared if a disaster occurs, and you can feel confident that you know what to do.
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Part I
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Introduction to Microsoft SQL Server 2005
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As the DBA, you should make any changes to SQL Server 2005, to the databases, or to the schemas contained therein. If these changes are handled by a developer, for example, you cannot verify the code that is going in or confirm what was changed and why. How can you maintain the integrity of the database when you allow others to make any changes Changes should always go through a QA/UAT process to confirm that they do not break accessing applications and receive a sign off before being moved into production. When you make the production changes, always document what is being done and by whom. Implement a true change management system along with bug tracking, and use a tool like Visual SourceSafe to retain older copies of procedures and schema changes. Finally, before you implement any change, be sure that you have a rollback strategy in case of any problems. After all, it s the DBA that the users will come to when they are unable to access their data.
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The DBA is responsible for providing an appropriate level of service to the customer or to the data consumer. This might be in the form of a contracted Service Level Agreement (SLA) or an agreement between departments. In either case, the DBA is held accountable for providing the highest level of service through server uptime and performance.
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System Monitoring
Routinely monitoring the system allows you to recognize problems early and deal with potential issues before they affect the customer directly. This could be from monitoring locks and blocks within the database to recognizing when CPU levels are rising or when a failure of a network card that eliminates redundancy within the system occurs. It is imperative that both SQL Server 2005 and the operating system are monitored. For example, you might get a call from a user stating that a query is running particularly slowly, but you find no locking conditions within the database to account for that. When you look at performance counters on the operating system, you see that CPU levels are running at 98 percent, severely affecting the user s ability to perform tasks. Likewise, that user might complain later in the day of the same problem. This time the CPU levels are low at 20 percent, but investigation within the database shows that there is a blocking process preventing the query from running. Pulling all of this information together helps to fix problems, but knowing your system can also help you to prevent problems by notifying users of queries that are using mass amounts of CPU on the system or returning huge result sets that are eating up network bandwidth. A good DBA is able to prevent problems with early identification and has
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