Use of MongoDB command line-make your data storage more efficient

About MongoDB

MongoDB 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. Features: High performance, easy to deploy, easy to use, easy to store data. This article describes the use of MongoDB's command line to make MONGODB operations more efficient.

MongoDB Features: High performance, easy to deploy, easy to use, storage data is very convenient.

Functional Features:

• Collection-oriented storage for easy storage of object-type data
• Mode freedom
• Support Dynamic Query
• Full index support, including internal objects
• Support Query
• Support for replication and failure recovery
• Use efficient binary data storage, including large objects (such as video, etc.)
• Automatically process fragmentation to support scalability at the cloud level
• Supports multiple languages such as node.js,ruby,python,java,c++,php
• File storage format is Bson (an extension of JSON)
• Accessible over the network

It is visible that MongoDB is very powerful. Therefore, mastering the use of the MongoDB command line can make your data storage more efficient.

Start MongoDB

[Email protected] ~]# CD usr/local/mongodb/bin[[email protected] bin]#. /2.6. 6 Connecting To:test

At this point, MongoDB started successfully!

MongoDB basic Commands

Show Database list

Show DBS

Display a collection in the current database (similar to a table in a relational database)

Show collections

Show Users

Show Users

Database Common Commands

Switch/CREATE Database

Use Yourdb

Querying all databases

Show DBS

Delete the currently used database

Db.dropdatabase ()

View the database currently in use

Dbdb.getname

View the link machine address of the current DB

Db.getmongo ()

Create a Clustered collection (table)

 - 5 +})

Get all the clustered collections of the current DB

Db.getcollectionnames ()

Gets the Clustered collection (table) of the specified name

Db.getcollection ("collectionname")

Clustered collection Query

Querying All records

Db.collectionname. Find ()

Query the first 5 data

Db.collectionname. Find (). Limit (5)

Query for data after 10

Db.collectionname. Find (). Skip (ten)

Querying for data between 5-10

Db.collectionname. Find (). Limit (ten). Skip (5)

Querying the first piece of data

Db.collectionName.findOne ()

Modifying a document

 db.collectionName.update ({columnName:   Columnval  }, {$set: {columnName:  columnval   ", ColumnName:  " columnval  " }} false , true ) 

Delete a document

" Columnval "})

User-related

Add a user

 Db.adduser ( name   " ) Db.adduser ( "  username  , "  pwd123  , true ) add user, set password, read-only 

Show all current users

Show Users

Delete User

Db.removeuser ("username");

Use of MongoDB command line-make your data storage more efficient