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Is MongoDB multi master?
Both instances of MongoDB are organised in the same replica Set (Server A as Primary, Server B as Secondary).
Is MongoDB active active?
MongoDB Active-Active Applications. MongoDB is an example of a sharded database architecture. In MongoDB, the construct of a primary server and set of secondary servers is called a replica set. Numerous organizations use MongoDB to implement active-active application architectures.
Is MongoDB schema less?
Is MongoDB schemaless? As a NoSQL database, MongoDB is considered schemaless because it does not require a rigid, pre-defined schema like a relational database. The applications you use to leverage data stored in MongoDB will enforce a much stricter dynamically typed schema as documents are read from the database.
What is a shard in MongoDB?
A shard is a replica set that contains a subset of a sharded collection (also known as chunks). A replica set consists of one or more mongod nodes that all maintain the same data set. Replica sets provide high availability.
What is shard key in MongoDB?
The shard key is either a single indexed field or multiple fields covered by a compound index that determines the distribution of the collection’s documents among the cluster’s shards.
What is chunk in MongoDB?
A chunk consists of a subset of sharded data. Each chunk has a inclusive lower and exclusive upper range based on the shard key. MongoDB splits chunks when they grow beyond the configured chunk size. A chunk that only contains documents with a single shard key value cannot be split.
What is the definition of replication in MongoDB?
Replication in MongoDB¶. A 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.
How long does it take to set a primary in MongoDB?
The median time before a cluster elects a new primary should not typically exceed 12 seconds, assuming default replica configuration settings. This includes time required to mark the primary as unavailable and call and complete an election .
What happens if my MongoDB database goes down?
In case some unexpected issue occurs, causing the primary database downtime (e.g. due to hardware failure or connection interruption), a new election process will be initiated automatically, helping to restore the normal application functioning, no manual intervention required.
Which is more reliable replication or master slave?
Replication is more reliable if it has an odd number of members in replica set. In case, you have created an even number of members (nodes), it would be better to add an Arbiter node which maintains a quorum by responding to heartbeat and election requests from other replica set participants: