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66 lines
2.0 KiB
66 lines
2.0 KiB
= Mongo -> services mongo
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*MongoDB* is a document database with the scalability and flexibility that you want with the querying and indexing that you need
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Classified as a NoSQL database program, MongoDB uses JSON-like documents with optional schemas.
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MongoDB is developed by MongoDB Inc. and licensed under the Server Side Public License (SSPL).
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== Main features
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* Ad-hoc queries
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** MongoDB supports field, range query, and regular-expression searches.
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* Indexing
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** Fields in a MongoDB document can be indexed with primary and secondary indices or index.
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* Replication
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** MongoDB provides high availability with replica sets.
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* Load balancing
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** MongoDB scales horizontally using sharding.
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* File storage
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** MongoDB can be used as a file system, called GridFS, with load balancing and data replication features over multiple machines for storing files.
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* Aggregation
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** MongoDB provides three ways to perform aggregation: the aggregation pipeline, the map-reduce function, and single-purpose aggregation methods.
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** Map-reduce can be used for batch processing of data and aggregation operations.
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* Server-side JavaScript execution
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** JavaScript can be used in queries, aggregation functions (such as MapReduce), and sent directly to the database to be executed.
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* Capped collections
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** MongoDB supports fixed-size collections called capped collections. This type of collection maintains insertion order and, once the specified size has been reached, behaves like a circular queue.
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Doc origin https://en.wikipedia.org/wiki/MongoDB#Main_features[wikipedia]
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== Replication in MongoDB
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replica set is a group of mongod instances that maintain the same data set. A replica set contains several data bearing nodes and optionally one arbiter node.
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image::ROOT:replica-set-primary-with-two-secondaries.bakedsvg.svg[float=right]
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TIP: http://docs.swarmlab.io/SwarmLab-HowTos/swarmlab/docs/swarmlab/docs/hybrid/start-storage.html[swarmlab provide storage options^]
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=== Video = intro
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****
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TIP: Mongo in 100 Seconds
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video::-bt_y4Loofg[youtube]
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****
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