MongoDB

Mongo 's introduction: This MongoDB website said good ah,MongoDB is an open source document -based database , and is a good NoSQL database, and it is written in C + + , very efficient. What are some of the characteristics? Full index support,

1.MongoDB Permissions IntroductionA in the previous article, we configured the MONGODB environment under Linux and set it to start with the service randomization, so the next article we will briefly talk about the management of the login user rights

#-*-Coding:utf-8-*-Import OSImport CSVImport PymongoFrom Pymongo import mongoclient#建立连接Client = mongoclient (' 10.20.4.79 ', 27017)#client = mongoclient (' 10.20.66.106 ', 27017)db_name = ' Ta ' #数据库名db = Client[db_name]In the Tvsplst collection of

1, Count: Query the number of recordsDb.user.count ()It can be as conditional as find.Db.user.count ({"Age":$})2. Distinct: Used to find all the different values of a given keyDb.user.distinct ("num")3, group: Group QueryKey: The field used to group

After the successful start of MongoDB, and then open a command line window input MONGO, you can do some of the database operations.Enter help to see the basic Operations Command:Show DBS: Display Database listShow Collections: Displays a collection

After you have just installed MongoDB, there is no administrator, if you want to set up for MongoDB administrator to start with a user-authorized way to start:/usr/local/webserver/mongodb/bin/mongod--dbpath=/usr/local/webserver/mongodb/data--logpath=

MongoDB can be started by command line and configuration file, the specific command is as follows:Command line:[[email protected] MongoDB] # ./bin/mongod--dbpath=/data/dbConfiguration file:[[email protected] MongoDB] # ./bin/mongod-f

Nodejs Environment1, install Nodejs to C:\nodejsHttps://nodejs.org/dist/v4.4.5/node-v4.4.5-x64.msi2, install Nodejs plug-in, command lined:\oldproject\web\mean-npbao>npmD:\OLDPROJECT\WEB\MEAN-NPBAO>NPM Install GRUNT-CLI3. Start Nodejs

In the previous article "MongoDB Master-Slave Model Building Example", we have a simple introduction to how to build a master-slave architecture of the MONGODB server environment. However, for the master-slave structure, MONGODB officials do not

MongoDB Data export, import, and index creation(1) Data Export-one file per table:# Mongoexport--db Project--collection table name--out output file name, such as:# Mongoexport--DB Project--collectionstock--out Stock.json, export all F10 data to file/

1 Database additions and deletionsOne, add a database:Use blog-----switch to the specified database, if the database does not exist, the database is automatically created (new database, if no corresponding collection is stored, is not

Objective This article mainly relates to the content: database backup and recovery, for any database, backup is crucial; data import and export; database repair; Database status monitoring tool mongostat; Other commands are summarized here when

Recently started to contact with node. js, in a blog, in the learning process, it must be a lot of contact with NPM package, mainly learning to use its API. What is written now is about the use of MongoDB. First MongoDB This package is used to

MongoDB-ConnectionIn this tutorial we will discuss different ways of connecting MongoDB. Start MongoDB ServiceIn the previous tutorial, we have discussed how to start the MongoDB service, you only need to execute ' mongod ' in the bin

MongoDB Installation The version used is 3.0 and the virtual machine operating system is rhel-server-7.0-x86_641. Upload and unzip the mongodb-linux-x86_64-rhel70-3.0.11.tgz to the/usr/local/mongodb directory2. Setting Environment variables#

Automatic installation of MongoDB via the Yum LibraryManually install the configuration MongoDBVerifying the MongoDB master-slave replication processVerifying the MongoDB replica set and implementing automatic switchingExperiment MongoDB uses GRIDFS

First, the basic Environment configuration;1, first to the official website (http://www.mongodb.org/downloads) Download the appropriate installation package, and then step by step next installation, of course, you can change the installation

MongoDB replication is the process of synchronizing data across multiple servers.Replication provides redundant backups of data, stores copies of data on multiple servers, improves data availability, and guarantees data security.Replication also

The installation of MongoDB under Linux should be simple, but there is a small point to note, which is why I wrote this blog.First download the latest stable version to its official website, extract to the directory, such as/usr/local/mongodbCreate

1. Connect MongoDB:Mongodb://username:[email Protected]/dbname2. Create a database:Use dbname: Create the database if the database does not exist, or switch to the specified database. 3. View all databases:Show DBSNote:The command does not display