Use rs.status() to identify the primary in the replica set. How does MongoDB detect replication lag? Replication lag is a delay in data being copied to a secondary server after an update on the primary server.
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The replication process works as below with the help of a replica set – Replica Set is a group of one or more standalone MongoDB Servers (normally 3 MongoDB Servers are required). In a Replica Set, one server is marked as Primary Server and rest are marked as a Secondary Serv...
MongoDB Stable API(以前标记为 Versioned API)允许随意升级 MongoDB Server,并确保不同 MongoDB 版本之间的行为更改不会破坏您的应用程序。 MongoDB 5.0 将引入 Stable API,以便应用程序与 MongoDB Server 产品进行通信。Stable API 允许指定应用程序要对其运行的 MongoDB API 版本。
MongoDB is a popular open source document database that’s widely used in modern web and mobile applications. It’s categorized as a NoSQL database, which means it takes a flexible, document-oriented approach to storing data rather than a traditional table-based relational method. A big part...
Replication MongoDB provides high availability with replica sets including two or more copies of the data. Writes are handled by the primary replica, while any replica is capable of serving read requests. If the primary replica fails, a secondary replica is promoted to become the primary replica...
Figure 3: MongoDB replication and sharding Sharding is a method for distributing data across multiple machines. There are various components in a sharded cluster:Trademark NoticeSharding is a method for distributing data across multiple machines. There are various components in a sharded cluster: ...
MongoDB uses a Transaction log internally just like many other databases. This is known as an Oplog in MongoDB. This serves as an internal log of every internal operation used for replication in a MongoDB Cluster. Each Replica Set, in a Sharded Cluster, has its own Oplog. This can be ...
Features of MongoDB include the following: Replication.A replica set is two or more MongoDB instances used to provide high availability. Replica sets are made of primary and secondary servers. The primary MongoDB server performs all the read and write operations, while the secondary replica keeps...
MongoDB supports replica sets for high availability. The core idea is that data is written once to a main instance, then duplicated to secondary stores for reads. Learn more about replication in MongoDB here. The bottom line is that MongoDB is a leading NoSQL solution that delivers on the...