Overview Capped collections are fixed-size collections that support high-throughput operations that insert and retrieve documents based on insertion order. Capped collections work in a way similar to circular buffers: once a collection fills its allo…

MongoDB stores data records as BSON documents. BSON is a binary representation of JSON documents, though it contains more data types than JSON. For the BSON spec, see bsonspec.org. See also BSON Types. Document Structure MongoDB documents are compose…

JSON can only represent a subset of the types supported by BSON. To preserve type information, MongoDB adds the following extensions to the JSON format: Strict mode. Strict mode representations of BSON types conform to the JSON RFC. Any JSON parser c…

MongoDB is an open-source document database that provides high performance, high availability, and automatic scaling. Document Database A record in MongoDB is a document, which is a data structure composed of field and value pairs. MongoDB documents…

BSON is a binary serialization format used to store documents and make remote procedure calls in MongoDB. The BSON specification is located at bsonspec.org BSON supports the following data types as values in documents. Each data type has a correspond…

MongoDB stores BSON documents, i.e. data records, in collections; the collections in databases. Databases In MongoDB, databases hold collections of documents. To select a database to use, in the mongo shell, issue the use <db> statement, as in the f…

最近的毕设需要用到mongoDB数据库,又把它拿出来再学一学,下盘并不是很稳,所以做一些笔记,不然又忘啦. 安装 mongoDB & mongoVUE mongoDB: https://www.mongodb.com/download-center?jmp=nav#enterprise mongoVUE: mongoVUE 是一个mongoDB 数据库的可视化界面 ,官网被墙了. 而且企业版15天后功能受限,所以在网上找了个破解版的. 好了,点击下载 ... mongoDB 我下载的是archi…

简单的研究原生API操作MongoDB以及封装的工具类操作,最后也会研究整合spring之后作为dao层的完整的操作. 1.原生的API操作 pom.xml <!-- https://mvnrepository.com/artifact/org.mongodb/mongodb-driver --> <dependency> <groupId>org.mongodb</groupId> <artifactId>mongodb-driver</…

此项目已开源,开源地址是: http://mongodbhelper-csharp.googlecode.com/svn/trunk/ mongodb的helper using System; using System.Collections.Generic; using System.Linq; using System.Text; using MongoDB.Driver; using MongoDB.Bson; using MongoDB.Driver.Builders; namespac…

一.为什么要配置mongodb的主从: 1.做主从,可以说是做数据的备份,有利于故障的恢复 2.做主从,可以做到读写分离,主节点负责写操作,从节点负责读操作,这样就把读写压力分开,保证系统的稳定性. 二.主从服务器的实现原理 首先,主节点会把本服务的与写有关的操作记录下来,读操来不记录,这些操作就记录在local数据库中的oplog.$admin这个集合中,这是一个固定集合,大小是可以配置的,主要是通过配置oplogSize这个参数来实现,单位是M,大小一般为磁盘剩余空间的5%左右.因为是固定集…