MongoDB

1. What isReplica set A replica set is a cluster of MongoDB replicas. The same-time principle is that the write operation occurs in the main library, which synchronizes the Oplog log from the main library. There is no specific main library in the

1. Download MongoDB, the version downloaded here is: Mongodb-linux-i686-1.8.1.tgz.tarHttp://fastdl.mongodb.org/linux/mongodb-linux-i686-1.8.1.tgzRecommended to go to the official website to download the latest version, currently the latest version 3.

Before I explained the installation of the MongoDB extension in PHP, and started, the link operation "forgot?" Go and see it! PHP operates one of MongoDB ". This article is mainly about the addition of MongoDB in PHP, query, modify and delete data

Insert and save a documentInsert a document using the Insert method for the target set:> Db.foo.insert ({"Bar": "Baz"})This will add a "_id" key to the document (if it is not) and then save it to MongoDB.BULK INSERTIf you are inserting multiple

Recently in the study of MongoDB database, wrote a fully automatic installation of MongoDB database shell script, for reference only, welcome to shoot bricks, the contents are as follows:#!/bin/bash# Shell Execution Options: #-N reads only the shell

Requirement Environment:There is a project that needs to upgrade MongoDB sharding from 2.6 to 3.0 and use the WT engine, where 2.6 of the environment many collectiong turn on sharding, and the amount of data is large.Select Mongodump,mongorestore

According to Objectid, time can be drawn.650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M02/76/0C/wKioL1ZJgHrhk31fAAAfQwCw9Eg777.png "title=" M.png " alt= "Wkiol1zjghrhk31faaafqwcw9eg777.png"/>Time zone["2014-01-01 00:00:00", "2015-11-15 00:0

1. first to the official website ( http://www.mongodb.org/downloads Download the appropriate installation package, the current version is 2.6 zip and msi format, recommended here to download zip format ,msi

MongoDB server-side JavaScript scriptCommon JavaScript statementsDb.getsiblingdb () db.getcollectionnames () db.getcollection () Db.printcollectionstat S ()Running JavaScript scripts in the MONGO shellTo switch databases:Use Run the following script:

In a product environment, high availability is a must-have goal. is the Shard cluster architecture diagram after MongoDB 3.0.A few points1. MONGOs implements the same service interface as Mongod, listens to the same 27017 port, MONGOs receives the

Query.all ("name", "a", "B"), or//through multiple elements to match the array Query.and (Query.eq ("name", "a"), Query.eq ("title", "T"));//satisfy multiple conditions at the same time query.eq ("name", "a");//equals Query.exists ("type", true);/

Although not a technical Daniel, but the team leader recommended to look at, and we are doing the project, similar to the resource center, involving a variety of weird data types of different sub-libraries, so so far has been used this way:①maindata

Persons data for this file is as follows:> Db.persons.find (){"_id": 2, "Name": 2}{"_id": 3, "Name": 3}> db.persons.update ({_id:4},{_id:4,name:4})Writeresult ({"nmatched": 0, "nupserted": 0, "nmodified": 0})> Db.persons.find (){"_id": 2, "Name": 2}{

This error on-line introduction is relatively small, recordRecent work encountered MongoDB insert time error, phenomenon:Thu Sep 09:19:15.011 error:messagingport::call () wrong ID got:367 expect:366Tosend op:2004Response msgid:2931523219Response len:

First install MongoDB1.:http://www.mongodb.org/downloads2. Unzip to the directory you want to install, such as F:\mongodb3. Create folders F:\mongodb\db, F:\mongodb\log, respectively, to install the DB and log files, create a log file under the log

first, to install MongoDB 1.:http://www.mongodb.org/downloads 2. Unzip to the directory you want to install, such as D:\mongodb 3. Create folders d:\mongodb\data\db, D:\mongodb\data\log, respectively, to install the DB and log files, create a log

Update Homebrew ' s package database.In a system shell, issue the following command:Brew Update2Install MongoDB.You can install the MongoDB via Brew with several different options. Use one of the following operations:Install the MongoDB BinariesTo

Original address: http://www.cnblogs.com/huangxincheng/archive/2012/02/21/2361205.htmlToday, I would like to share with you the more interesting knowledge of MongoDB, including: aggregation, cursor.One: AggregationCommon aggregation operations are

Any relational database that has a typical schema design that shows the relationships between the table and these tables. Although in MongoDB, there is nothing to relate to the concept.The advantages of MongoDB over RDBMS Schema: MongoDB is a

Introduction to MC & Redis & Ehcache I haven't updated my blog for a long time. I hope I can continue writing my blog later. Now I find this is a great process. I 've sorted out the usage and introduction of cache a long time ago. Now I post it as