Think of a search engine's web host as being streamlined. This system has 100 machines that can reply to search queries. These machines can then call out to another cluster of machines using the processSearch(string query) function to actually obtain the results. You cannot ensure that the same machine will always reply to the same query because the machine that answers a given query is selected at random. ProcessSearch is a very pricy technique. Create a caching system to store the outcomes of recent searches. Don't forget to describe how you'd refresh the cache if the data changed.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Think of a search engine's web host as being streamlined. This system has 100 machines that can reply to search queries. These machines can then call out to another cluster of machines using the processSearch(string query) function to actually obtain the results. You cannot ensure that the same machine will always reply to the same query because the machine that answers a given query is selected at random. ProcessSearch is a very pricy technique. Create a caching system to store the outcomes of recent searches. Don't forget to describe how you'd refresh the cache if the data changed.

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