Monday, November 11, 2013

 Primer on Caching techniques

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Caching is a technique to speed up data lookups (data reading). Instead of reading the data directly from it source, which could be a database or another remote system, the data is read directly from a cache on the computer that needs the data. Here is an illustration of the caching principle:

A cache is a storage area that is closer to the entity needing it than the original source. Accessing this cache is typically faster than accessing the data from its original source. A cache is typically stored in memory or on disk. A memory cache is normally faster to read from than a disk cache, but a memory cache typically does not survive system restarts.

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