A MongoDB index is similar to a typical relational database index.ģ. In MongoDB, indexes assist in efficiently resolving queries by storing a small portion of the data set in a convenient form. The index stores the value of a particular field, or set of fields, ordered by their value. A MongoDB index stores a small portion of the data set in a form that is convenient to traverse. Indexing: A MongoDB field can be indexed with primary and secondary indices or indexes. To resolve the election of the new primary, three standalone servers must be added as secondary servers.Ģ. Secondary replicas may additionally serve read operations, but the data is only eventually consistent by default. Whenever a primary replica crashes, the replica set automatically determines which secondary should become the primary and conducts an election if necessary. Secondary replicas keep a copy of the data of the primary, preserving it in an orderly manner, as part of a replicated MongoDB system. A replica-set acts as a primary or a secondary replica. Two or more copies of data constitute a replica set. Replication: The MongoDB replica set feature is known for providing high availability.
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