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DOCS-580 FAQ: database caching #371

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Nov 6, 2012
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DOCS-580 FAQ: database caching #371

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DOCS-580 cache FAQ
Nov 2, 2012
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DOCS-580 first draft of changes
Nov 2, 2012
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15 changes: 15 additions & 0 deletions source/faq/fundamentals.txt
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Expand Up @@ -135,6 +135,21 @@ in RAM, MongoDB serves all queries from memory.
MongoDB does not implement a query cache: MongoDB serves all queries
directly from the indexes and/or data files.

Does MongoDB require a separate caching layer for application-level caching?
----------------------------------------------------------------------------

No. In MongoDB, a document's representation in the database is similar
to its representation in application memory. This means the database
already stores the usable form of data, making the data usable in both
the persistent store and in the application cache. This eliminates the
need for a separate caching layer in the application.

This differs from relational databases, where caching data is more
expensive. Relational databases must transform data into object
representations that applications can read and must store the
transformed data in a separate cache. If joins are required that adds to
the overhead.

What language is MongoDB written in?
------------------------------------

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