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In strategy B, we have assumed that the access methods for EMP relations are based on an ASG The RESP and ENO features are lost due to data transmission. This is a reasonable assumption.
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Strategy A is better by a factor of 50, which is quite significant. provides better If we assume that wok distribution between sites is slower, the difference becomes greater Communication and/or a high degree of dispersion.
Purpose of query processing The purpose of query processing in a distributed context is to translate high levels
Queries for distributed databases. An important part of query processing is query optimization.
Many execution strategies are the correct transformation of the same high-level query What optimizes (minimizes) resource consumption needs to be maintained. A good measure of resource consumption is the total cost incurred.
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Query processing. The total cost is the sum of all the time it took to process. Manipulating queries on different sites. In a distributed database system, the total cost of minimization, including CPU, I/O, and
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The first two components (I/O and CPU costs) are the only factors It is considered by the central database management systems. Connection costs will dominate in WAN, but not so It is prevalent in local networks.