MongoDB

Turn from: http://www.cnblogs.com/lipan/archive/2011/03/08/1966463.html First, prefaceRecently began to learn the non-relational database MongoDB, but in the blog Park can not find a comparative system of the tutorial, a lot of information to

First, MongoDBMongoDB is an open source, free, non-relational database (NOSQL). It has a fast and easy to use, data format and JSON correspondence, and so on, the most important feature is that all data durable operation without the developer to

MongoDB insert Operation Syntax: Db.collection.save (collections); or Db.collection.insert (collections);There are two ways of inserting.1. Borrowing objects to insert>item={id:1,name: "Hello"}>db.lottu.insert (item)2. Insert data in a

Tag:io    use    sp   on    data    div    bs   cti   ad    Database common commands 1, help view command prompt   help  db.help ();  db.yourColl.help ();  db.youColl.find (). Help ();  Rs.help (); 2. switch/CREATE DATABASE  use yourdb;   when a

Network Source--http://www.jb51.net/article/53830.htm1. Create a Super UserDb.createuser ( { User: "li0924", pwd: "123", roles: [ { role: "Useradminanydatabase", db: "admin" } ] })There are two types of

Before the start of MongoDB is quite normal, do not know the start error later, the paste out query. Finally know is due to their abnormal shutdown caused by this situation.--Excerpt: MongoDB abnormal shutdown after repair recordMongod no background

The main purpose is to use node. js to link MongoDB with Mongoose. With the Ejs engine, extending to. html is easierThe small example has a simple structure and a clear frame. Submission method Path method effect

1. Installing MongoDB1 wget http://www.phpwindow.com/linux/mongodb-linux-x86_64-2.2.1.tgz2tar zxvf Mongodb-linux-x86_64-2.2.1.tgz3mv Mongodb-linux-x86_64-2.2.1/usr/local/mongodb4 mkdir-p/usr/local/mongodb/data/mongodb_data 5

Db.app_users.aggregate ([ {      $project:{          fs:1,         ls:1,          subt:{$subtract: [' $ls ', ' $fs ']},          days714:{              $cond:  [  {  $gte: [' $ls ', (Math.Round (New date ()). GetTime ()  / 1000) -14*24*60*60)]},1,0] 

In the recent period of learning MongoDB, a total of more than 40 blogs have been written during the course of learning. From MongoDB software download to the construction of the Shard cluster. From the theoretical explanation to the practical

??Method 1DBObject dbobject = new Basicdbobject ();Dbobject.put ("status", 1);DBObject fieldobject = new Basicdbobject ();Fieldobject.put ("CatalogName", true);Fieldobject.put ("_id", true);Query query = new Basicquery (DBObject, fieldobject);return

This article goes on to the above four articles to continue to describe the Shard cluster construction under the window platform MongoDB. Indexes can also be created in a shard cluster in the same way that indexes are created in a separate database.

In the last two blogs, we have elaborated the working principle and the construction process of the Shard cluster respectively. In this blog we mainly analyze the test results of the Shard cluster;First look at the various states of the Shard

Http://www.cnblogs.com/ITAres/articles/2084794.html This article is from the official manual:Http://www.mongodb.org/display/DOCS/Advanced+Queries#AdvancedQueries-ConditionalOperators%3A%3C%2C%3C%3D%2C%3E%2C%3E%3D1). Greater than, less than, greater

This article mainly describes the main principles of the Shard clusterFrankly, just see this shard system (sharding) a little bit, feeling a bit too big on the. See American writer Kyle Banker "Mongodb in action" is not clear. and query data, first

First, the objectIDthe BuildEach MongoDB document requires a primary key, which must be unique for all documents in each collection, and the primary key is stored in the document _id field. consists of three characters;4c291856 238d3b 19b2 0000014

In this blog we mainly talk about the access control including limitation of IP, setting listen port and usage of username and password. In the official document, MongoDB server start without the argument, so once the connection is created, the

Analyze Query Performancethe Explain () cursor method allows you to observe the operations performed by the query system. This method is useful for analyzing efficient queries and determining how indexes are used for querying. This method detects

Gridfs IntroductionMongoDB documents are stored in Bson format and support binary data types when we store binary format data directly into MongoDB's documentation. However, when files are too large, such as samples and videos, each document is

Add the bin path to the environment variable after the MongoDB decompressionCreate A.bat and B.bat files:A.bat content:Mongod--dbpath F:\MongoDataB.bat content:MONGO 127.0.0.1:27017/adminA.bat is the boot MongoDB server,--dbpath is used to specify