Objective 1.2: Implement caching
The way applications are used and the corresponding demands have changed in just the last few years. Users are much more demanding, less tolerant of inconveniences, and much more concerned about performance. It is commonly mentioned that if users have to wait more than five seconds for a page to load, they will typically leave the page.
Just try to imagine how many users an application like Bing has, and imagine what would happen if Bing kept open connections to the underlying databases for each user. There are several techniques that have been developed to deal with such issues, but one of the most effective ones is caching. Some data (for instance, stock quotes) needs to be the absolute latest every time it is ...
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