MongoDB如何确保高可用

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How does MongoDB ensure high availability?

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MongoDB automatically maintains replica sets, multiple copies of data that are distributed across servers, racks and data centers. Replica sets help prevent database downtime using native replication and automatic failover.

A replica set consists of multiple replica set members. At any given time one member acts as the primary member, and the other members act as secondary members. If the primary member fails for any reason (e.g., hardware failure), one of the secondary members
is automatically elected to primary and begins to process all reads and writes.

Learn more in the MongoDB Architecture Guide.