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In this example, address translation is required (nat-control command) All of the devices off of the inside interface will have their source addresses translated to an address in the 2002002000 subnet when exiting the outside interface The addresses are dynamically assigned by the appliance by choosing unused ones in the pool NOTE One important point to make about the network in Figure 5-13 and the configuration shown earlier is that the connection between the appliance and the perimeter router is using the 19216810/24 subnet, and the appliance is translating packets to the 2002002000 subnet By default the perimeter router doesn t know about this network The easiest solution to this problem is to create a static route on the perimeter router pointing to 19216811 to reach the 2002002000 subnet

We can tune the indices in a system to improve performance If queries are the bottleneck, we can often speed them up by creating appropriate indices on relations If updates are the bottleneck, there may be too many indices, which have to be updated when the relations are updated Removing indices may speed up certain updates The choice of the type of index also is important Some database systems support different kinds of indices, such as hash indices and B-tree indices If range queries are common, B-tree indices are preferable to hash indices Whether to make an index a clustered index is another tunable parameter Only one index on a relation can be made clustered, by storing the relation sorted on the index attributes Generally, the index that bene ts the most number of queries and updates should be made clustered To help identify what indices to create, and which index (if any) on each relation should be clustered, some database systems provide tuning wizards These tools use the past history of queries and updates (called the workload) to estimate the effects of various indices on the execution time of the queries and updates in the workload Recommendations on what indices to create are based on these estimates

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Perimeter Router Physical E0/0 E0/1 Logical outside inside Security Level 0 100 E0/0 Appliance 19216821/24 19216822/24 19216830/24 19216840/24 E0/1 Internet 19216812/24 19216811/24

Geography: One of the most popular methods of organizing salespeople is by geographic area Geographic territories assume the buyers are alike and one salesperson can handle all the customers within a geographic area Stratified/size: Another method of organizing territories is by account size In a stratified sales organization, one group of salespeople calls on large customers; another group calls on medium-sized customers; and a low-cost resource handles small customersA stratified sales organization will most likely have both named-account and geographic territories Account status: Another territory configuration method divides territories into two categories: noncustomers and existing customers Sometimes called hunter and farmer territories, this configuration allows sales personnel to focus on one primary task: hunters who sell to new accounts and farmers who manage existing accounts Vertical/industry: Grouping accounts by industry type (vertical) provides sales personnel with the ability to understand the unique

Maintaining materialized views can greatly speed up certain types of queries, in particular aggregate queries Recall the example from Section 145 where the total loan amount at each branch (obtained by summing the loan amounts of all loans at the branch) is required frequently As we saw in that section, creating a materialized view storing the total loan amount for each branch can greatly speed up such queries Materialized views should be used with care, however, since there is not only a space overhead for storing them but, more important, there is also a time overhead for maintaining materialized views In the case of immediate view maintenance, if the updates of a transaction affect the materialized view, the materialized view must be updated as part of the same transaction The transaction may therefore run slower In the case of deferred view maintenance, the materialized view is updated later; until it is updated, the materialized view may be inconsistent with the database relations For instance, the materialized view may be brought up-to-date when a query uses the view, or periodically Using deferred maintenance reduces the burden on update transactions An important question is, how does one select which materialized views to maintain The system administrator can make the selection manually by examining the types of queries in the workload, and nding out which queries need to run faster and which updates/queries may be executed slower From the examination, the system administrator may choose an appropriate set of materialized views For instance, the administrator may nd that a certain aggregate is used frequently, and choose to materialize it, or may nd that a particular join is computed frequently, and choose to materialize it However, manual choice is tedious for even moderately large sets of query types, and making a good choice may be dif cult, since it requires understanding the costs.

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The McGraw Hill Companies, 2001