MongoDB

1. A Brief History of NoSQLThe term NoSQL first appeared in 1998 and is a lightweight, open source, relational database that does not provide SQL functionality developed by Carlo Strozzi.In 2009, Last.fm's Johan Oskarsson launched a discussion on a

A simple instance of node. js Connecting to MongoDBInstall the node. JS Driver　　NPM Install Mongodb-saveConnectionvar Mongodbclient = require (' MongoDB '). mongoclient; var url = ' Mongodb://localhost:27017/microblog '; // your DB host function (

MongoDB System File Description 1.mongo.exe command-line client Tools 2.mongod.exe database service program 3.mongodump.exe Database backup tool 4.mongoexport.exe Data Export tool 5.mongofiles.exe GRIDFS tool 6.mongoimport.exe Data Import Tool

The index is used to speed up the query. Creating a database index is like determining how to organize the index of a book. But your advantage is knowing what queries will be made in the future and what needs to be found quickly. For example: All

MongoDB version 3.2 Wiredtiger storage engine performance test Chszs, not allowed to reprint without Bo master. Permission to reprint should be marked by the author and blog home: Http://blog.csdn.net/chszsMongoDB 3.2 was recently released, and it

One, replica set configurationSet up, 1 main instances, 1 units from the instance, 1 arbitration instances. MongoDB recommends an odd number of machines in a replica setSecond, C # connection string1. ReadMongodb://secondary.com/?slaveok=true2.

Replicattion set is that multiple servers maintain the same copy of the data, increasing the availability of the server.Replication Set Setup whole process0: Create a directoryMkdir-p/DATA/R0/DATA/R1/DATA/R21: Start 3 instances and declare instances

Reference: http://www.lanceyan.com/tech/arch/mongodb_shard1.htmlI. Introduction of MONGODB shardsEarly in the system, the amount of data will not cause too much problem, but as the volume of data continues to increase, the subsequent sooner or later

First, the environment$ cat/etc/redhat-release CentOS Linux release 7.0.1406 (Core) $ uname-alinux zhaopin-2-201 3.10.0-123.el7.x86_64 #1 SMP Mon June 12:09:22 UTC x86_64 x86_64 x86_64 gnu/linux$ MONGO--versionmongodb Shell version:3.0.6 Second,

Synchronousecho offSettime_dir=%date:~0,4%-%date:~5,2%-%date:~8,2%Setbak_dir=mongo_na_world_svn2win_%time_dir%Setmongo_dir=e:\mongodb\mongodb-win32-i386-2.2.3Setfromdb=Db_eragon_game_na_world%mongo_dir%\bin\mongodump.exe-h192.168.102.237-D%fromdb%-O%

First, download MongoDB, then installHttp://downloads.mongodb.com/win32/mongodb-win32-x86_64-enterprise-windows-64-2.6.4-signed.msi?_ga= 1.238525191.607472782.1411452026Then, to the installation directory, create two folderscd to Bin directory,

MongoDB projection means to select only the necessary data instead of selecting the entire data for a file. If a document has 5 fields, you need to display only 3, and then select only 3 fields.Find () methodMongoDB's Find () method, which is

Introduction to ShardsSharding is a method of using multiple machines to store data, and MongoDB uses shards to support huge amounts of data storage and manipulation of data.Purpose of ShardingHigh data volume and throughput of the database

IntroducedScala is a kind of functional object-oriented language . It blends a lot of unprecedented features. At the same time, it executes on top of the JVM . With the growing interest of developers in Scala , and the increasing number of tools to

MongoDB is configured and accessed through configuration files under WindowsBlog Category: Mongodb Database Mongomongodbwindows ConfigurationMongoDB configuration file configuration:The first step: Create a new file in the

Vim mongodb_install.sh#!/bin/bashcd /opt/echo  "Download mongdb software ..." wget https://fastdl.mongodb.org/ linux/mongodb-linux-x86_64-ubuntu1404-3.0.4.tgzecho  " mongdb software ..." tar -zxf 

Limit methodIf you need to read a specified number of data records in MongoDB, you can use the MongoDB limit method, and the limit () method accepts a numeric parameter that specifies the number of record bars read from MongoDB.MONGO #进入mongoDBuse

This article describes installing MongoDB in a Windows environment and adding it to a Windows service, starting with the systemFirst go to the official website to download the Windows installation package: Https://www.mongodb.org/downloadsIn general,

Back to CatalogSay it is a bulk operation, that is, to commit the collection object to the server one at a time, and persist the data , if your code is a one-time commit, it is not counted as a bulk operation! In the previous MongoDB warehousing did

Comparison between ODBC and JDBC In the process of learning J2EE JDBC, we immediately thought of ODBC when we first saw JDBC, and we can be sure that there is an inevitable relationship between them. When I started learning it, I still felt a little