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Installing multi-instance clusters without considering the resource implications of failover situations. Creating logins/jobs with elevated privileges. Implementing least privilege can be tough work, but it s essential in locking down a system for maximum security. Changing configuration values from their default settings without adequate research and/or a detailed change log. Placing data and transaction logs on the same physical disk(s). Storing backups on the same disk as the database files. Relying on autogrow for file sizing, and leaving the tempdb database at its default size. Not making backups and/or not checking their validity and/or not practicing and documenting various recovery situations. All of these are equally bad. Leaving the database in the full recovery model without taking transaction log backups. Implementing database mirroring in high-safety (synchronous) mode without considering network latency and/or transaction log usage from index maintenance. Not running regular DBCC checks. Running REPAIR_ALLOW_DATA_LOSS as the primary/default recovery response, and not following up corruption events with a root-cause analysis. Not evaluating index usage and/or fragmentation levels as part of an indexmaintenance routine. Updating statistics using the default sampling rate after a full index rebuild. Using SQL Profiler in place of server-side traces, and using it as the primary performance analysis/tuning technique. Doing manual administration with SQL Server Management Studio. For maximum efficiency and minimal errors, tasks should be scripted and automated, and you should employ appropriate monitoring and alerting mechanisms such as MOM or SQL Agent operators and alerts.

The tasks presented here are general DBA tasks that are appropriate in most instances. Obviously each environment will have specific tasks, and depending on the automation techniques and monitoring software, the implementation and monitoring of these tasks will differ. For that reason, implementation and monitoring commentary have been excluded. The goal of this section is to suggest a starting point in developing a site-specific DBA task list.

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1 Mary Harvey, Elements of E-commerce Success, Folio Special Source Book Issue (2000): 192 94 2 Jeff Rubin, Forget Stock Options: Referrals Are the Recruiter s Latest Weapon, Wall Street Journal (August 1, 2000): B16 3 Rebecca Quick, Returns to Sender, Wall Street Journal (July 17, 2000): R8 4 Internet Sales Eating Away at Bricks & Mortar Retailing, PR Newswire (March 22, 1999): Westport, Conn, Lexis-Nexis 5 Mathew Schwartz, Sharper Staples, Computerworld (June 12, 2000): 76 78 6 William M Bulkeley, Clicks and Mortar, Wall Street Journal (July 17, 2000): R4 7 Kelly Barron, Penney Wise, Forbes (September 4, 2000): 72

As the powers of the polynomials increase, the fimctions become harder to graph In chapter 4 more complicated polynomials will be graphed with the aid of calculus

Check for successful backup completion, including tape archives if using the disk then tape backup methodology. Confirm SQL Server Agent jobs completed successfully. Check free disk space on all disks, including system drives and SQL Server data, log, tempdb, and backup disks. Check the free space of each database s data and transaction log files and expand if necessary to avoid autogrow operations. Check SQL Server errors logs and Windows event logs. Confirm DBCC checks executed without error by opening and inspecting the appropriate log files. Depending on the DBCC check frequency, this may be a weekly task. Check site-specific tasks as appropriate, such as the success of archive batch jobs. Check technology-specific tasks as appropriate, such as log shipping or database mirroring status/health. Throughout the day, monitor long-running queries and general performance of critical servers using a dashboard of key Performance Monitor counters.

Stay up to date with SQL Server via magazine/website articles, blogs (using a good RSS reader), and other general-research methods. Good managers understand the importance of allocating time to this task.

Collate and update Performance Monitor log information for baseline analysis purposes, looking for emerging trends among counter values. This information will feed into the monthly capacity-planning task. Review recent wait statistics and include them alongside the Performance Monitor counter information in the performance baseline. Execute index and statistics maintenance jobs (during periods of low activity) as appropriate. For systems with large enough maintenance windows, this may be a simple rebuild of all indexes (while being aware of the impact on log shipping/database mirroring) or a more targeted approach that selects the appropriate technique (reorganize/rebuild) based on the fragmentation level. Record disk usage trends and note them for the monthly capacity-planning exercise. Review server configuration for unauthorized configuration changes. Policybased management is purpose built for this task.

Solution: Attempting to evaluate the b c t i o n for large x produces the result large number over large number Taking the limit with a little inventive algebra (multiplying the fiaction by I / x2 over 1 / x2) produces

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