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Figure 2.1 Characterizing I/O workload is a crucial prerequisite in designing the appropriate storage system. Unlike OLTP, OLAP systems typically consist of fewer but larger sequential read dominant transactions.

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As a high-availability technology, clustering has a number of advantages and limitations when compared to other SQL Server high-availability options such as database mirroring and transaction log shipping (covered in chapter 11). Its primary advantage is that in the event of a server failure, the entire instance and all of its databases are moved to a failover server, a process that usually takes no more than about 90 seconds. This stands in contrast to mirroring or log shipping solutions, which are established on an individual database-by-database basis. In addition to providing protection from unexpected server failure, the other major benefit of clustering is the ability to reduce downtime during planned outages. For example, consider a requirement to upgrade a server s RAM. Unless we have a server with hot-add RAM capabilities, we d need to power off the server, upgrade the RAM, and power back on again, and during this time the database instance would be unavailable. In a clustering scenario, we could manually initiate failover, which would move the instance from one server to the other, enabling the upgrade to occur while the instance is available on another cluster server. Thus, the downtime is limited to the failover time, typically about 1 minute.

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level have less and less involvement in the scientific or technical area that they have chosen and enjoy Or do they remain scientists and technicians and leave the management to someone else Higher salaries, the desire to have an impact on the larger organizational issues, and a sense of advancement often attract people to management positions At some point in an individual s career, a choice must be made Ideally, a programmer or analyst will have this choice Some highly skilled programmers and analysts find themselves at a dead end because they are too hard to replace if moved into management If management is their ambition, then they are forced to issue an ultimatum or to change companies Once promoted or committed to management, managers at any level should broaden their knowledge of networks, computer security, databases, telecommunications, and other areas to ensure their value to the company at higher levels Because of the pressure to learn more about business, programmers and analysts sometimes enter executive masters of business administration (EMBA) programs These programs are designed for midcareer professionals who want a better business background but do not want to interrupt their careers to get it Admission to such programs usually requires about ten years of work experience and some managerial responsibility These programs stress on-the-job applications with a business orientation More educational opportunities for managers are being offered over the Internet The work and pressures are great, but then this, too, is excellent preparation for promotion to top-level management

Unlike database mirroring and transaction log shipping, the major limitation of clustering, particularly in Windows Server 2003 and earlier, is that other than a RAID solution, there s no protection from failure of the disks containing the database files and/or the cluster quorum resource, discussed shortly. Further, typical clustering solutions don t offer protection from geographic disasters that is, if all clustered servers exist in a single location, the destruction of that location will result in an outage. Although multisite clusters and the new Windows Server 2008 quorum models (discussed shortly) address these limitations, it s a common practice to combine multiple high-availability solutions to deliver the advantages of each while minimizing the individual limitations. For example, important databases within a clustered SQL Server instance can be mirrored to an offsite location for geographic (and disk) protection. We ll cover such combinations in more detail in chapter 11.

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