MongoDB

ArticleDirectory Bala nosql & MongoDB Django's support for nosql Django + MongoDB options Django + logging Engine Others Bala nosql & MongoDB Currently, nosql does not have a standard definition. The most common explanation

Mapreduce with MongoDB and python from artificial intelligence in motion Author: Marcel Pinheiro caraciolo) Hi all, In this post, I'll present a demonstration of a map-Reduce example with MongoDB and server side JavaScript. based on the fact that

Recently, I have been working on lbs-based projects, and I have not found a simple and convenient method for landmark coordinate indexes and coordinate-based queries, when optimizing Mongo indexes, we found that there were actually geo indexes. 1.

I recently started to read some articles about MongoDB.ArticleMore and more think that it is what I need. However, I know very little about it first. I can see that it is a superficial phenomenon. I started reading the MongoDB introduction written

Field returned by the query Previously, crud mentioned only selector, but field_selection was not mentioned. In fact, the find () method has two parameters. By default, the second parameter is *, that is, all fields are returned. If you want to

Today, I tried to use the MongoDB database on a 64-bit server. The disk array of the server's hard disk is composed of 10 Gb hard disks. Because of the consideration of using the master/salve mechanism for backup, the hard disk can be fully utilized,

1. Start and Stop MongoDB: Run mongod to start the MongoDB server. Mongod has many configurable options. We can use mongod -- help to view all options. Here we only introduce some main options: -- Dbpath: By default, the data directory of the

As we all know, when performing time-consuming operations (for example, crawling and analyzing website data ),Background threadThe interface will be suspended. To solve this problem,. NET will provide us with a lot of solutions.Background

In frontArticleOnce mentioned, when using $ or and sort () in MongoDB, the query performance will be poor, see: http://www.cnblogs.com/xinghebuluo/archive/2011/12/01/2270590.html This bug may be modified in MongoDB 2.5.w. I also encountered this

In addition to basic query functions, MongoDB also provides powerful aggregation functions. Here we mainly introduce count, distinct, and group. 1. Count: -- In an empty set, Count returns 0. > DB. Test. Count ()0 -- Test the return value of

This article is from the "Ten-day master MongoDB" series PPT last year. The content of this series of PPT is from the "MongoDB authoritative guide (English version)" at that time. The personal translation capability is limited, and the content of

PHP // The delimiter string is $ Querys = Array ("Name" => "Shian" ); // Number of equal values $ Querys = Array ("Number" => 7 ); // What is the value greater $ Querys = Array ("Number" => Array ('$ GT' => 5 )); // The number is greater

What is MongoDB and its advantages and disadvantages? I will not introduce them here. Article The main purpose is to understand MongoDB through actual operations.   MongoDB installation and initialization 1: http://www.mongodb.org/   2

This was originally posted to Kristina chodorow's blog, snail in a turtleneck I participated in writing the journaling section in the definitive guide, but I realized that many of the implementation details were not paid enough attention to, so I

Nosql has undoubtedly become the most popular in the database industry in recent years, and Oracle has begun to develop. I am not very familiar with non-relational databases, so I am better at learning MongoDB. Regular notes are also a good habit of

This article mainly introduces the MongoDB Log Module and the code implementation method of the data persistence storage module. You may be surprised why the Log Module and persistent storage module will be summarized in an article. Hey, in other

Find Method DB. collection_name.find ();   Query all results: Select * from users; DB. Users. Find (); Specify the columns (KEYS) returned ): Select name, skills from users; DB. Users. Find ({},{ 'name': 1, 'skills': 1 }); Note: The first {} puts

1. Basic query:Construct the query data.> Db. test. findOne (){"_ Id": ObjectId ("4fd58ecbb9ac507e96276f1a "),"Name": "stephen ","Age": 35,"Genda": "male ","Email": "stephen@hotmail.com"} -- Multi-condition query. The following example is equivalent

Knowledge Point: mongoDB Sharding is an automatic data Sharding. Data is automatically migrated in different data servers. The migration trigger conditions include the data volume and access traffic. 1. Create a sharding cluster in two parts: one is

1. You can change the partition mode for the existing data storage mode of a single instance. 1.1 start and configure the service instance and route service instance respectively. 1.2 add an existing single instance to the partition mode. 1.3