Secondaries can optionally serve read operations, but that data is only eventually consistent by default.
When a primary replica fails, the replica set automatically conducts an election process to determine which secondary should become the primary. Secondary replicas maintain a copy of the data of the primary using built-in replication. All writes and reads are done on the primary replica by default. Each replica-set member may act in the role of primary or secondary replica at any time. A replica set consists of two or more copies of the data. MongoDB provides high availability with replica sets. Queries can also be configured to return a random sample of results of a given size.įields in a MongoDB document can be indexed with primary and secondary indices or index. Queries can return specific fields of documents and also include user-defined JavaScript functions. MongoDB supports field, range query, and regular-expression searches. Customers can use the managed offering from BABA's global data centers. On October 30, 2019, MongoDB teamed up with Alibaba Cloud, who will offer its customers a MongoDB-as-a-service solution.
MongoDB is a global company with US headquarters in New York City and International headquarters in Dublin. On October 20, 2017, MongoDB became a publicly traded company, listed on NASDAQ as MDB with an IPO price of $24 per share. In 2013, 10gen changed its name to MongoDB Inc. In 2009, the company shifted to an open-source development model, with the company offering commercial support and other services.
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10gen software company began developing MongoDB in 2007 as a component of a planned platform as a service product.
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