MongoDB

//View all DatabasesShow DBS//Amdin 0.000GB//Local 0.000GB//Working with DatabasesUse admin//switched to DB admin//Create a database: Insert a record into the databaseDb.user.insert ({' name ': ' Wangxi ') })//Writeresult ({"ninserted": 1})//Show

# MONGODB Query StatementMongoDB: Distributed File Store database, between relational database and non-relational database, Concept: collection (table), document (row), Field (column)tychtml Database:# 1. Number of document queries? Db.getcollection

Db.createuser (User,writeconcern)User This document creates identity authentication and access information about usersWriteconcern This document describes a successful report that ensures that MongoDB provides write operationsThe user document,

History:MongoDB is a document-oriented database. It provides document-oriented storage.The concept of no relationship in MongoDBFunctional Features:1, support special query support regular expression search2. You can index any field in the document3,

The IP address configuration in the replica set needs to be modified because the virtual machine address is occupied and the IP address needs to be reset:1: View configuration rs.config (), need to locate primary host, have permission to modify

Think about it or write it, after all, online tutorials have a lot of pits.First download MongoDB, if you suspect the official website slow, then you can go to my Baidu cloud download link: Http://pan.baidu.com/s/1pKEWTBX Password: v3y4, install

MongoDB used by the databaseMongoDB Download: https://www.mongodb.com/MongoDB gui:https://robomongo.org/Using middleware KOA to build frameworksUsing middleware monk to link databases//Import KOA, unlike KOA 1.x, in KOA2, we are importing a class,

Yesterday colleagues installed MongoDB encountered some problems, asked me, after pull found are some details did not pay attention to (reason it should be very simple, a good operation on the OK thing)First, download the MONGO package,Then, unzip

Let pipeline = [{$lookup: {From: "User_person",Localfield: "Cardnumber",Foreignfield: "Cardnumber",As: "Right_person"}},{"$unwind": "$right _person"},//investigate the subdocuments that meet the conditions{$match: {//Here the subdocument is

One1, based on distributed file storage2, add more nodes under high load, can guarantee the performance of the server3. Store data as a documentSecond, Comparison1. Stability2, index, index in memory, can improve the performance of random read and

In MongoDB 2.4 and previous versions, Db.collections.update ({...},{"$set": {}}), or "Empty $set", can be performed normally. With Upsert and other parameters can be used in different convenient use.however , after upgrading to MongoDB 2.6, the

MongoDB is a NoSQL database that stores something like a JSON object that supports some operations similar to a relational database. Here is the Java operation MongoDB.First, establish a connection (without using any framework, the connection is

Here are some of the basic concepts of MongoDB: A document is a basic unit of data in MongoDB, similar to a row in a relational database. Collection, which is a container for storing documents, similar to a table in a relational

To ensure a secure MongoDB runtime environment, DBAs need to implement some control to ensure that users or applications simply access the data they need. These measures include, but are not limited to: Authentication mechanism

Cluster authenticationIntroduction: We introduced the single strength of the certification method, just I am engaged in Lepus monitoring, replica collection requires user authenticationA verification method:1 Auth mode start = "Single point"2

Delete data, collection, database:To delete a document:Db.media.deleteOne ({"Name": "Sky"})To delete multiple documents:Db.media.deleteMany ({"Name": "Sky"})Db.media.remove ({"Name": "Sky"})To delete a collection:Db.media.drop ()To delete a database:

Writeconcern:Reprint: MongoDB Writeconcern (write attention) mechanismHttp://www.ywnds.com/?p=3688&viewuser=40MongoDB Deployment ModeThere are three types of MongoDB deployment modes: The first is stand-alone mode (development test), the second is a

Index detailsIndex managementSpatial index for (var i = 0; i) { Db.books.insert ({number:i,name:i+ "book"})}1. Create a simple indexData Preparation Index.js1.1. Check the query performance firstvar start = new Date ()Db.books.find ({number:65871}

Method/Step Login to MongoDB official dot click on the right side of the download Select the Windows platform and click on the zip file you need to download (I am here to install the main complaint zip file)The legacy version can be used for

MongoDB CodeView 10 db in reverse chronological time. The table name. Find ({"_id": "XXX"}). Sort ({"Inserted": -1}). Limit ({")". Skip (1)　　The relative PHP code $POSTARR = $this->mongo->executequery ( table name, [