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query optimizer to recognize when a materialized view can be used to speed up a query Replacing a use of a materialized view by the view de nition: Suppose a materialized view v = r 1 s is available, but without any index on it, and a user submits a query A=10 (v) Suppose also that s has an index on the common attribute B, and r has an index on attribute A The best plan for this query may be to replace v by r 1 s, which can lead to the query plan A=10 (r) 1 s; the selection and join can be performed ef ciently by using the indices on rA and sB, respectively In contrast, evaluating the selection directly on v may require a full scan of v, which may be more expensive The bibliographical notes give pointers to research showing how to ef ciently perform query optimization with materialized views Another related optimization problem is that of materialized view selection, namely, What is the best set of views to materialize This decision must be made on the basis of the system workload, which is a sequence of queries and updates that re ects the typical load on the system One simple criterion would be to select a set of materialized views that minimizes the overall execution time of the workload of queries and updates, including the time taken to maintain the materialized views Database administrators usually modify this criterion to take into account the importance of different queries and updates: Fast response may be required for some queries and updates, but a slow response may be acceptable for others Indices are just like materialized views, in that they too are derived data, can speed up queries, and may slow down updates Thus, the problem of index selection is closely related, to that of materialized view selection, although it is simpler We examine these issues in more detail in Sections 2125 and 2126 Some database systems, such as Microsoft SQL Server 75, and the RedBrick Data Warehouse from Informix, provide tools to help the database administrator with index and materialized view selection These tools examine the history of queries and updates, and suggest indices and views to be materialized.

146 Summary

ciscoasa(config)# interface physical_name ciscoasa(config-if)# ip address dhcp [setroute] [retry retry_count]

Given a query, there are generally a variety of methods for computing the answer It is the responsibility of the system to transform the query as entered by the user into an equivalent query that can be computed more ef ciently The process of nding a good strategy for processing a query, is called query optimization The evaluation of complex queries involves many accesses to disk Since the transfer of data from disk is slow relative to the speed of main memory and the CPU of the computer system, it is worthwhile to allocate a considerable amount of processing to choose a method that minimizes disk accesses The strategy that the database system chooses for evaluating an operation depends on the size of each relation and on the distribution of values within

The setroute parameter causes the appliance to accept the default route from the DHCP server this is typically done when your outside interface is acquiring its addressing dynamically from the ISP If you omit this parameter, you ll need to configure a default route on your appliance (this is discussed in 4) You can also specify the number of times the appliance should attempt to obtain its addressing

The McGraw Hill Companies, 2001

Hurdle: No incentive can be earned past 100% of goal unless the retention rate is greater than 80% of last year s sales revenue from existing customers

3:

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Many of the optional configurations available in active/standby exist in active/active, as well as a few others the main difference is where and how the commands are executed Here are the optional commands you can configure for active/active failover:

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standby(config)# [no] failover active group group_# active(config)# failover link logical_LBF_if_name active(config)# failover group {1 | 2} active(config-fover-group)# preempt [seconds] active(config-fover-group)# replicate http active(config-fover-group)# polltime interface [msec] time [holdtime time] active(config-fover-group)# interface-policy number[%]