MongoDB

In this blog the procedure of MongoDB would be is described in details. It is known that MongoDB have provided a series of efficient solution to some different questions, such as high performance , changeable type and so on. Compared with the MySQL

MongoDB Linux InstallationDownload the latest version of MongoDB, download link: http://www.mongodb.org/dr/fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.0.2.tgz/downloadEnter TAR–XZVF mongodb-linux-x86_64-2.0.2.tgz into the/usr/local/mongodb

Package Com.x.mongodb; Import java.net.UnknownHostException; Import Java.util.HashMap; Import java.util.List; Import Java.util.Map; Import Org.bson.types.ObjectId; Import Com.mongodb.BasicDBObject; Import Com.mongodb.DB; Import

Recently consider the transfer of order history data from Oracle database to NoSQL database for historical data query and analysis, one day tens data, intends to use the MongoDB database, using Nodejs to do query and statistics API, the demand for

Now several game projects of the company mainly use MongoDB to store game data, so the monitoring of MongoDB is very important. Other monitoring methods for MongoDB are described in the following articles:MongoDB Monitoring AMongoDB monitoring Two

Build the EnvironmentEnvironment for WIN8 x64, download installation omitted. After that, the MongoDB Bin directory is added to Windows's path for later ease of use.C-Disk New storage folder: c:/data/dbRun Service: win+r, enter mongod.exe--dbpath c:/

We know MySQL we need to set a default user name and password for the database during installation. MongoDB It's no exception, but MongoDB The default is not set access restrictions, do not need to enter the user name and password can be accessed,

Objective:This article mainly records the partial DDL operations of the main MongoDB Collection. DB view current database (default test)> dbtest > Show DBS View database names on the current database server> Show Dbsadmin (empty) Local 0. 078

Step1:Download Https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.4.11.tgz The latest version, this is the linux64 bit, you can also go to the homepage own choiceStep2:Unzip the tar vxf mongodb-linux-x86_64-2.4.11.tgz, and after extracting it,

Question One Shard configuration is completely correct, the MONGOs service can start normally, the choice of tablet keys is also reasonable (previously tested locally), but the data is always concentrated on a shard? The final resolution procedure,

Mongo DB is a non-relational database (NOSQL) that is currently very popular in the IT industry, and its flexible data storage methods are favored by current it practitioners. Mongo db is a good way to implement object-oriented thinking, in Mongo db,

A problem with MongoDB recently is that it's annoying to have a command prompt window. Search on the Internet, MongoDB comes with a service can be made to use. Good, so you can run in the background, do not need to worry about accidentally closed

MongoDB's monitoring preferred: MongostatMongostat is really very useful, if the DB has an exception, my first reaction is to look at Mongostat. If it is the operation of the word, drinking coffee, watching mongostat, life is really comfortable ah.

Large SkipWhen paging the data, it is generally necessary to skip how many records and limit how many records, such as in MySQL: SELECT * from large_table ORDER by ' id ' LIMIT 10000, 30 This process is slow because the database needs to be

First, MongoDB IntroductionTraditionally, a relational database management system (RDBMS) is used to manipulate databases through the standard language of SQL. In contrast, NoSQL databases do not use the SQL language. As a result, sometimes people

In the original: share my simple code to test the MONGODB databaseSource code: Http://www.zuidaima.com/share/1550463424236544.htmDistributed file storage System, MONGODB deployment installation can be referenced as

Nosql DBThis is a non-relational database. We typically have three types of databases: relational database (RDBMS), Online Analytical Processing database (OLAP), and Philippine Relational Database (NOSQL).MongoDB belongs to the third type, and is a

The value of y in query set C is null or does not exist >db.c.find ({"Y": null}) The value of y in query set C is null, (only data with the value null of Y is returned, does not return non-existent) >db.c.find ({"Y": {$type: 10}})

Use of the MongoDB Shell JS (ii)The MongoDB shell is not only an interactive shell, but also can be accessed using a JS script.Advantages and disadvantages of using JS script to interact(1) No driver or language support is required;(2) To facilitate

Due to the natural mistrust of MySQL (don't know), ready to try something new, Redis is a memory database some understanding, this time try to have more storage feeling of MongoDBFrom Pymongo import Connectioncon = Connection ()Connection = Pymongo.