MongoDB

Generally take the first method, directly transfer files, the second method suitable for the generation of data not saved to the local upload but directly to the binary system to MongoDB, the third way is to directly upload the form of the file into

First type: Parent link structureDb. categories. Insert ({_ID:"MongoDB", Parent:"Databases"})Db. categories. Insert ({_ID:"DBM", Parent:"Databases"})Db. categories. Insert ({_id: "Databases", Parent: "Programming"})db. Categories. Insert ({ _id:

Mongdb when reading data with the cursor, the data read directly with the stream key is the beginning of the number of words, is not unique, with Object.keys () all the key printed out the words are as follows: How is this?Looking at the document,

Mongodb two ways to clusterCopy setis usually a master one from, a master more fromMongoDB requires a minimum of two nodes for replication. One is the master node, which handles client requests, and the rest is the slave node, responsible for

First, the database commonly used commands1. Help View command PromptThe code is as follows: HelpDb.help ();Db.yourColl.help ();Db.youColl.find (). Help ();Rs.help ();2. Switch/CREATE DatabaseThe code is as follows: Use YOURDB; The current database

To learn index classifications and create indexes:1._ID Index The default index for most collections2. Single key index: Manually created, a single value3. Multi-built Index: composite function4. Composite index: The leftmost prefix principle5.

1>, synchronization: Replication is used to back up data between multiple servers.The replication functionality of MongoDB is implemented using the log Oplog, the operations log contains each write operation of the master node.Oplog is a fixed

SQL Terminology/Concepts MongoDB Terminology/Concepts Explanation/Description Database Database Database Table Collection Database Tables/Collections Row Document

The logical structure of MongoDB is a hierarchical structure. Mainly consists of three parts: Document, Collection (collection), database. A logical structure is a logical structure used by user-facing users to develop applications using MONGODB.The

Environment:192.168.99.129 Master192.168.99.130 slave11. Configuring Replication SetsExecute separately on both servers" Rs0 "To execute the MONGO command, first add ars.initiate ({ "rs0", 0"master:27017 " } ]})and add another one.Rs.add ("slave1

First, insert a Bjson data into the databaseThe first is to define the document, then log in with the admin username password, enter the test database, insert this document into the test database ("table name and records in table")Insert results,

Official website http://www.mongodb.org/Download Http://www.mongodb.org/downloadsInstallation Tutorial http://docs.mongodb.org/manual/tutorial/install-mongodb-on-linux/This is for Linux serversTutorials for CentOS

1. Installing MongoDBMongoDB installation is very simple, just need to extract the downloaded MongoDB compressed files to any directory, and add the bin directory to the system's path environment variable can be2. Start MongoDBBefore you start

Replication set (Replica sets) is a master/slave replication mechanism for asynchronous synchronization of the same data, so that multiple machines have more than one copy of the same data, due to the automatic failover and recovery features, When

One, the whole library backup:Mongodump-h dbhost-d Dbname-o dbdirectory-H:MONGDB the server address, for example: 127.0.0.1, you can also specify the port number: 127.0.0.1:27017-D: The database instance that needs to be backed up, for example: test-

Basic Operation: How do I install it? Create a folder to hold data Robomongo: Graphical management tool Create-->save-->connect CREATE DATABASE: Use database_name Check the currently selected database: DB Check Database list:

MongoDB is a nosql type of database, high-performance, easy to deploy, easy to use features in the IT industry is very popular.The following describes the installation of MongoDB, here we are installed under Linux, using the centos6.4 64-bit, you

1. Download the latest stable version of the installation package.[Email protected] mongodb]$ wget-c--no-check-certificate https://fossies.org/linux/misc/mongodb-linux-x86_64-3.2.11.tgz2. Unzip the installation package.3. Set environment

MongoDB Installation with MongoDB service configurationMongo DB is a non-relational database (NOSQL) that is currently very popular in the IT industry, and its flexible data storage methods are highly favored by current it practitioners. Mongo DB is

Recently, the security team detected that some Alibaba Cloud users have unauthorized access to the MongoDB database. This vulnerability is harmful and can easily cause database leaks. To ensure the security of your business and applications, you