MongoDB

MongoDB installed and configured under Windows 1, download: http://www.mongodb.org/We recommend downloading the zip version.2. InstallationDownload Windows version installation just like normal software, the next step is right.3. Start the

After the successful start of MongoDB, and then open a command line window input MONGO, you can do some of the database operations.Enter help to see the basic Operations Command:Show DBS: Display Database listShow Collections: Displays a collection

1. Assume that 1 database server is Active server (master server), 2 and 3 is the backup server, when 1 fails, then will be in 2 and 3 to elect one (according to the weight of the rules) as an active server, and when 1 is back to normal, it will be

Mongo System Database Introduction and permission settings. This article is only valid for mongo2.61 , and the commands in the lower version are slowly replaced or deprecated in the new version. For example, use db.adduser () in the mongo242

#regionSort gets collection static list Getpagerwithgroup (String connectionString, String databaseName, string collect Ionname, imongoquery param, Groupbybuilder groupbybuilder, PageInfo info, out int pagecount)/// ///group Query Get

public class Mongodbhelper {//define MONGO service private mongoserver MONGO = NULL; get databasename corresponding database, do not exist automatically create private mongodatabase mongodatabase; //Mongo database connection/// public

This article is a serious example of the difficulties encountered in using MongoDB, and the reasons for eventually discarding MongoDB.Spent a lot of time to read, but have not carefully read the review, and so on which day is not busy, you can

MongoDB Chinese Document: http://docs.mongoing.com/manual-zh/contents.htmlHere, for example, with the collection name test, the database inserts some test data through a for loop, with the keys: name,age,date　　db.test.find () querying all the

We know that MySQL will need us to set a database default username and password when installing,MongoDB is no exception, but MongoDB is the default does not set access restrictions, You do not need to enter a user name and password to access, but

1. Conditional operator= This operator does not have to explain more, the most commonly used is the simplestDb.collection.find ({"field": {$gt: Value}}); Greater than: field > ValueDb.collection.find ({"field": {$lt: Value}}); Less than: Field

1. Inserting experimental dataLazy to use the samus,100 bar.1 for(inti =0; I -; i++)2 {3Document doc =NewDocument ();4doc["ID"] =i;5doc["MSG"] ="value is"+i;6 Mongocollection.insert (DOC);7}Insert Successful2.

The following is the original website address:http://docs.mongodb.org/manual/tutorial/create-an-auto-incrementing-field/ProfileThe _id field of MongoDB exists as a primary key at the top level of all documents, and _id must be unique and always have

MongoDB provides a variety of index support, the index information is saved in System.indexes, and the default is always to create an index for _ID, its index uses the basic and MySQL and other relational database. In fact, it can be said that the

1. introduction of the index :Monggodb 's index is also a balanced binary tree , so most of the index optimization techniques in traditional databases are also available .Note : MongoDB can traverse the data in any direction ( This is not the same

The index and relational database indexing concepts and functions of MongoDB are the same:(1) Non-indexed search can be called full table sweep, that is, the server must find a complete table in order to query the entire result;(2) After the index

1. Download the installation file from MongoDB website: (download zip is recommended)Http://www.mongodb.org/downloads2. Create a folder in the C drive-MongoDB3. Unzip the zip package to C:\MongoDB, now the file structure is as follows:4. Create a

1. Add a MongoDB installation sourceVim/etc/yum.repos.d/mongodb-enterprise.repoWrite the following configuration entries to the file[Mongodb-enterprise]name=mongodb Enterprise repositorybaseurl=https://repo.mongodb.com/yum/redhat/$releasever/

1 Packagecom.voice.db;2 3 ImportCom.mongodb.DB;4 Importcom.mongodb.DBCollection;5 ImportCom.mongodb.Mongo;6 Importcom.mongodb.MongoClient;7 Importcom.mongodb.MongoClientOptions;8 Importcom.mongodb.ReadPreference;9

These days the project revision, time is tight, blog also did not follow, also hope everyone forgive.Well, today we share the basic operation of the index in MongoDB, we do not have to develop the daily development of the program to optimize

In MongoDB there is another cluster, that is, sharding technology, similar to the SQL Server table partition, we know that when the amount of data reached the T level, our disk, memoryThat's how we deal with this scenario.One: ShardMongoDB uses a