MongoDB

First go to the official website to download MongoDB down.Different versions of MongoDB are installed differently. So be careful when installing.After MongoDB decompression, the directory has Mongo.exe open the program, the DOS interface appears.

Shard ClusterThe data shard in MongoDB is called Chunk, which is a continuous data record in a collection, but it has a size limit that can not exceed 200M if the new shard is generated. Here is a simple instance of a shard clusterthe composition of

/** * Query Financial statements * @author Liupeng * @param timestart * @param timeend * @return *///public list FINDBYTIMEF Orfinal (String Timestart, String timeend) {public list findbytimeforfinal (string Timestart, String Timeend)

First of all this is normal, because secondary is not allowed to read and write, in the application of writing more than read, using the replica sets to achieve read and write separation. By specifying Slaveok at the time of connection, or by

Sharding is a distributed process, but the load of MongoDB is different from other loads, and in the whole MongoDB distributed cluster, there are the following roles:Mongos:mongos is a routing server that will distribute data to its own managed

1. With the MONGO of the previous article, we need more information, such as database name, username and password, to connect to the database.We can continue to configure the instance of Mongodbfactory. Public Interface mongodbfactory { throws

MongoDB's mapreduce mainly consists of two methods: Map and reduce.For example, let's say we have the following 3 records{"_id": ObjectId ("4e5ff893c0277826074ec533"), "X": ["a", "B""_id": ObjectId ("4e5ff893c0277826074ec534"), "X ": [" B "," C ""

First, the index base:MongoDB's index is almost identical to the traditional relational database, which includes some basic optimization techniques. Here is the command to create the index:> Db.test.ensureIndex ({"username": 1})You can see whether

Preparation: Insert 1 million data first for (i=0;i) { Db.users.insert ({ "i": I, "username": "user" +I, "Age": Math.floor (Math.random () *120), "created":new Date () })} 1. Create an index: the

The data in MongoDB has a flexible pattern. Unlike SQL databases, which require that you have to decide and declare a table's schema before inserting data, the MongoDB collection does not enforce the structure of the document. This flexibility

Problem Description:When MongoDB shuts down abnormally, it can cause the index file to be corrupted, causing the data not to be reflected on the index when it is updated.Solution:Use the script to rebuild the index of all the tables in MongoDB.var

article from my personal blog: MongoDB mapreduce use summary ?As we all know, MongoDB is a non-relational database, that is, each table in the MongoDB database is independent, there is no dependency between the table and the table. In MongoDB, in

Unformatted Printing> Db.games.find () {"_id": ObjectId ("53d077372826c5d3aae7ad6a"), "Game": "Pinball", "User": "Joe", "Score": 5050}Format Print> Db.games.find (). Pretty () {"_id": ObjectId ("53d077372826c5d3aae7ad6a"), "Game": "Pinball", "User":

#!/bin/sh# # # BEGIN INIT INFO# Provides:mongodb# Required-start:# Required-stop:# Default-start:2 3 4 5# default-stop:0 1 6# Short-description:mongodb# Description:mongo DB Server# # # END INIT INFOExport lc_all= "C". /lib/lsb/init-functionsProgram=

Previously used Nodejs to connect the operation MongoDB, but recently need to use C # to operate MongoDB needs, so the next C # driver research. MongoDB officially provides C # driver source Https://github.com/mongodb/mongo-csharp-driver on GitHub.

I. Installing the MONGODB PHP extensionwget http://pecl.php.net/get/mongo-1.2.7.tgz//Download Expansion packTar zxvf mongo-1.2.7.tgzCD mongo-1.2.7/usr/local/php/bin/phpize./configure-with-php-config=/usr/local/php/bin/php-configMakeMake installNote:

Dependent Packages:1.pymongo2.jieba#-*-Coding:utf-8-*-"""@author: Jiangfuqiang"""From Htmlparser import HtmlparserImport Urllib2Import SysImport PymongoImport timeImport JiebaImport Tracebackdefault_encoding = ' Utf-8 'If sys.getdefaultencoding ()! =

1.findDb.bind_info.find ({"Bd_type": 1})2.countDb.bind_info.find ({"Bd_type": 1}). Count ();3. Return to Fixed fieldDb.users.find ({},{"name": 1, "Age": 1})For example, if you want to create a "myTest" database, run the use myTest command first,

Def getmydatalist ():#id这个keykey = str (U ' ID '). decode (' Utf-8 ')#存储旧数据的id列表Old_ids = []#存储新微博的列表EXTR_WB = []#从MongoDB上获取的数据Old_datalist = Weibodata.find ()For-old in old_datalist:Old_ids.append (Old[key])#从微博上抓取新数据data =

This time, the use of C#driver, MongoDB for a simple query.We can use the static method in the query class to create a series of queries to achieve the purpose of the query.Query is in the using MongoDB.Driver.Builders namespace.1. Single condition