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One of the biggest challenges database developers face is how to optimize their indexes to obtain the most efficient query response. When developing indexes for database applications, the following guidelines should be considered:

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RAID 10 is a combination of RAID 1 and RAID 0. You implement RAID 10 at the hardware level rather than by using the Windows operating system. In RAID 10, you connect mirrored disk pairs together to form a RAID 0 array. For example, a RAID 10 array is built using six hard disk drives. Three mirrored sets are created and then data

Always look at the query plan first It will show you the optimal current execution plan from the query engine s point of view Find the most expensive part of the execution plan and start optimizing from there However, even before that, make sure that the statistics on all tables in your query are up-to-date by running the update statistics command on all tables in your query If you see table scan, optimize Table scan is the slowest possible way of execution Table scan means not only that no index is used, but that there is no clustered index for this table at all Even if you can only replace table scan with clustered index scan, it is still worth it If you see clustered index scan, find out whether it can be replaced with index seek For that, find the conditions applied to this table.

With the addition of a new product catalog, the Web site is experiencing stability issues. Customers are also prevented from purchasing products or services at various times during the day when changes are being made to the underlying data. The company has just fired the consulting firm responsible for developing and man aging the Web site and all other applications within the company because of a failure to provide any availability for business-critical systems.

The newly hired chief technical officer (CTO) has been tasked with implementing high availability for all business-critical systems. The CTO has just hired a database administrator (DBA) and system administrator to assist in this task as well as manage the day-to-day operations.

Usually, conditions exist for two or three fields of the table Find out the most selective condition (that is, the condition that would produce the smallest number of records if applied alone), and see whether an index on this field exists Any index that lists this field first will qualify If there is no such index, create it and see whether the query engine picks it up If the query engine is not picking up the existing index (that is, if it is still doing a clustered index scan), check the output list It is possible that seek on your index is faster than clustered index scan, but involves bookmark lookup that makes the combined cost greater than use of a clustered index Clustered index operations (scan or seek) never need bookmark lookup, because a clustered index already contains all the data.

There are 11 databases within the environment, as shown in Table 11-1.

is striped across these three mirrored sets. When a file is written, it is split equally between each of the mirrored sets. Because RAID 10 does not require parity calculations, it provides faster write speeds than RAID 5. For a RAID 10 set to fail, both disks of a mirrored pair would need to fail at the same time.

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