Users.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. Short windows of replication lag are normal, and should be considered in systems th...
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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...
A big part of MongoDB’s appeal is its simplicity and developer focus. For example, Mongo interactions are defined by the acronym CRUD, for create, read, update, delete. MongoDB saves data in JSON documents that make it relatively easy to use stored data—whether it’s structured, ...
Fields in a MongoDB document can be indexed with primary and secondary indices. MongoDB supports a number of different index types, including single field, compound (multiple fields), multikey (array), geospatial, text, and hashed. Replication ...
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...
📢 MongoDB是开源产品 📢 On GitHub Url:https://github.com/mongodb 📢 Licensed under the AGPL,有开源的社区版本 📢 起源& 赞助by MongoDB公司,提供商业版licenses 许可 这些优势造就了mongodb的丰富的功能: JSON 文档模型、动态的数据模式、二级索引强大、查询功能、自动分片、水平扩展、自动复制、高可用...
MongoDBalso supports high availability, using a replication facility called replica set (a group of MongoDB servers that maintain the data set thus providing automatic failover, data redundancy, and availability). There is also support for horizontal scalability where sharding distributes data across ...
Cassandra can offer an easier transition for enterprises looking for a NoSQL solution because it has a syntax similar to SQL; it also reliably handles deployment and replication without a lot of configuration. However, it can’t match MongoDB’s flexibility for handling structured and unstructured...