MongoDB

Data storage is a very important part of the entire system, in MySQL, Redis has a master-slave architecture, to a certain extent, to ensure the security of data and high availability, and MongoDB is also the implementation of this way. Master-Slave

说明： MongoDB由databases组成，database由collections组成，collection由documents组成，document由fileds组成。MongoDB是异步写数据。Chapter I environment configuration one, MongoDB introduction Functional characteristics Scope of application Functional

The user writes the data using the interface provided by the database, and the data is stored in a standard format.Different database differences: The organization of the data is different, while providing different types of queries, users according

Before all good, the result server database added a verification, check, also not complicated, as long as the connection string a change on the line.Results, constant error--invalid credentials for databaseLooking for a long reason, originally I

Fixed collection (for logging)A fixed set needs to be created in advance, and its size is fixed. When a fixed collection is full, if you insert a new document again, the pinned collection automatically removes the oldest document from the collection.

One: The export function of MongoDBMongoDB provides the ability to import and export, respectively, the Mongoexport.exe and Mongoimport.exe files in the MongoDB download directory, the specific Export command format is as follows:Mongoexport-h

Mongodb3.0 new FeaturesWiredtigerMMAPv1Pluggable Engine APIWeb-based visual management toolsView version numberMongod--versionStart the databaseMongod--dbpath $dbpath--logpath $logpath--logappend--fork--port= 27000$dbpath Data Catalog$logpath is the

This article records the steps I made to install MongoDB under the Win7 32 bit for recording.First, download MongoDB: https://www.mongodb.com/download-center#communityYou can download the zip package or MSI installation file, and then unzip it and

Original: http://www.cnblogs.com/yucongblog/p/6895983.htmlDetailed illustrations documenting the process of installing the MONGO database in Win7 64. The installed version is mongodb-win32-x86_64-2008plus-ssl-3.4.1-signed.I downloaded the source

First, we'll install the database. You can use Windows or Linux, but it is recommended to use Linux, I use ubuntu12.04. The URL below can be downloaded, basically a 64-bit system.Assuming a bit Linux system can also be installed using the command

1. Introduction　It used to be developed using the django+ relational database MySQL, which now requires the use of django+ non-relational database MongoDB, which can be used directly in Django for MySQL operations, but Django does not support

Objective:These records are updated to MongoDB by spout transmitting Kafka data to bolt to count the number of each word.Spout's Nexttuple method will always be in a while loop, and once each piece of data is sent to the bolt, the bolt will call the

The previous article describes the use of the template engine Pug.js, which is mainly written in the background logic.Backstage most of the functions have, but in the state of being logged in, the foreground and the background of the logical

View all databases:> Show DBS;Select a database:> Use ECommerce;To view the current database status:> Db.stats ();To view all the collections in the current database:> Show Collections;To view the collection status:> DB. Toperatelog.stats (1024)To

Resources: YCSB GitHub Address: Https://github.com/brianfrankcooper/YCSB Wiki:https://github.com/brianfrankcooper/ycsb/wiki Installation reference: Https://github.com/brianfrankcooper/YCSB/tree/master/mongodb Some previous Test

1. Test ToolsThis test chooses YCSB (Yahoo! Cloud System Benchmark) as the test Client tool. YCSB is a NoSQL test tool for Yahoo Open source, used to test the performance of a variety of NoSQL, project address:

1. Download the installation packagewget http://fastdl.mongodb.org/linux/mongodb-linux-i686-1.8.2.tgzUnzip the package after download is completeTar zxf mongodb-linux-i686-1.8.2.tgz2. Install ready to move MongoDB to the/usr/local/server/mongdb

One, MongoDB command说明：Mongodb命令是区分大小写的，使用的命名规则是驼峰命名法。 对于database和collection无需主动创建，在插入数据时，如果database和collection不存在则会自动创建。Common commandsHelp commandWith this command you can see some of the most basic commands,Use commandFor example, command "Use

This blog explains how to build a multiplayer blog, which requires a certain amount of basic knowledge for thought-finishing and memo-writing.The first step: Create a new folder blog, the structure is as follows: The bin---executable binary,

A question about the index document in MongoDB?-To illustrate index intersection, consider a collection orders which has the following indexes:{Qty:1} {Item:1}MongoDB can use the intersection of the indexes to the following query:Db.orders.find