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Ubuntu Unleashed 2013 Edition: Covering 12.10 and 13.04, Eighth Edition by Matthew Helmke

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Memcached and MemcacheDB

Memcached stores data requested on a system in RAM for a specific period of time to make retrieving that data faster if it is requested again. The time that data persists can be based on a specific setting, memory needs, and other criteria. The goal is to reduce the number of times that data stores must be accessed. Data that is accessed often is held in memory, from where it is much more quickly retrieved. This can alleviate problems such as a page on a blog that has suddenly become popular as a result of the URL being posted on a social networking site. The spike in traffic could be kept manageable because the content of the blog post is being held in memory instead of being requested over and over from the database. ...

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