MongoDB

Objective:MySQL and MongoDB are common open source databases, but MySQL is a traditional relational database, MongoDB is a non-relational database, also known as a document database, is a NoSQL database. They each have their own merits, the key is

MongoDB Data BackupIn MongoDB we use the Mongodump command to back up MongoDB data. The command can export all data to the specified directory.The Mongodump command allows you to specify the server to which the exported data can be dumped by

DatabaseIncreaseUse DB1 #有则切换, none addedCheckShow DBS #查看所有DB #当前By deletingDb.dropdatabase ()Collection:Increase:Db.userDb.user.infoDb.user.authViewShow collectionsShow tablesBy deletingDb.user.info.drop ()Document:IncreaseDb.user.insert ({"_id": 1

MongoDB provides a 64-bit installation package for each Linux distribution, and you can download the installation package on the website.: https://www.mongodb.com/download-center#communityDownload the installation package and unzip the tgz(the

MongoDB Download MongoDB offers pre-compiled binary packages for 32-bit and 64-bit systems that you can download from the MongoDB website,MongoDB Pre-compiled binary package: https://www.mongodb.com/download-center#communityCreate data Directory

MongoDB has become increasingly a database of processes and mainstream, for two reasons: the first is technical advantage, the second is convenience, personal use deployment is very convenient.the pros and cons of MongoDB, and usage

Enumerate common commands for MongoDB monitoring1. Monitoring statisticsMongostat can be used to view the current qps/memory usage/connection number, as well as the pressure distribution of multiple ShardCommand Reference./mongostat --port 27071 -u

1.Download MongoDB2. unzip the file into a directory and rename it: [Root@localhost var]# tar-xzvf mongodb-linux-x86_64-enterprise-rhel62-3.4.9.tgz [Root@localhost var]# mv Mongodb-linux-x86_64-enterprise-rhel62-3.4.9/usr/local/mongodb

MongoDB Data BackupIn MongoDB we use the Mongodump command to back up MongoDB data. The command can export all data to the specified directory.The Mongodump command allows you to specify the server to which the exported data can be dumped by

1. Visit the MongoDB Download Center, https://www.mongodb.com/download-center#enterprise, select OS X x64 system, click Download, may appear a page let you fill in the contact information and so on2. After the download is a

MongoDB is not remotely connected by default, and after Linux installation you will find that its directory is extremely simple, not even a configuration file. The version of my MongoDB is 3.6, currently the newest. https://www.mongodb.com/mongodb-3.

MongoDB Concept Analysis:Database tables that are equivalent to SQL: CollectionDocument: Data record lines that are equivalent to SQLField: Data field equivalent to SQLTable connection, MongoDB not supportedPrimary key, MongoDB automatically sets

Https://www.cnblogs.com/Kellana/p/5844919.htmlIn a MongoDB cluster, if exists orphaned documents and chunk migration, the count query may result in an incorrect query result, such as I was stepping on the pit, first not talking, see the result:Skip

Previous article, wrote MongoDB General operation, continue to write, this chapter mainly talk about advanced query, text, aggregation, Big Data query.MongoDB has a lot of query syntax and is a richer one in the NoSQL ranks. Of course, there are

Recently read some articles about MongoDB, and then want to know how Nodejs is connected so I try to understand a wave (this rookie station this site is also good, although the knowledge of the document is not the latest, but still fine;By the way

Environment: Ubuntu 14.04.1 MongoDB v3.4.1 Virtual Machine Connection mode is a NAT connection First, MongoDB startup problemAfter updating the kernel, when running MongoDB, the Data directory/data/db not found. Error, the time

Use the show DBS command to see what needs to be noted is that when you just created a database that is empty, show DBS does not see for example > Use mymongoswitched to db mymongo> dbmymongo> s How dbslocal 0.000GB I created Mymongo but because

Overview of Web microblogging system based on node and MongoDBThe project was inspired by the "node. JS Development Guide", where the author Byvoid was the first Node developer at the time, and the learner desperately needed a demo. Of course, it

When MongoDB is installed and configured for WINDOWS Services, version 1.x. x does not have serviceName. solution 1. x. xservicename Let's talk about the problems and solutions encountered during mongodb installation. If you encounter the same

Apsaradb for MongoDB permission management and apsaradb for mongodb permission management By default, you do not need to enter the username and password for MongoDB.The customer can log on. But there will be a lot of Warning, such: So -- for the