MongoDB is a document-oriented database program. MongoDB supports field, range query, and regular-expression searches. MongoDB provides high availability with replica sets. A replica set consists of two or more copies of the data. Each replica set member may act in the role of the primary or secondary replica at any time.
MongoDB can run over multiple servers, balancing the load or duplicating data to keep the system up and running in case of hardware failure.
MongoDB provides three ways to perform aggregation:
1. The aggregation pipeline.
2. The map-reduce function.
3. Single-purpose aggregation methods.
MongoDB has official drivers for major programming languages and development environments. There are also a large number of unofficial or community-supported drivers for other programming languages and frameworks.
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