MongoDB installation Deployment (i)

Objective

MongoDB is a distributed file store-based database written in the C + + language and is a popular one in today's NoSQL databases, designed to provide scalable, high-performance data storage solutions for Web applications.

Mongodb

Brief introduction

MongoDB is a product between a relational database and a non-relational database, and is the most versatile and most like relational database in a non-relational database. The supported data structures are very loose, so you can store more complex data types. The most important feature is that its supported query language is very powerful, its syntax is somewhat similar to object-oriented query language, almost can achieve similar relational database single-table query most of the functions, but also support the indexing of data.

Features and functional characteristics

Features: High performance, easy to deploy, easy to use, easy to store data

The main features are:

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 ruby,python,java,c++,php

File storage format is Bson (an extension of JSON)

Accessible over the network

Advantages and Disadvantages

The advantages of MongoDB compared to non-relational databases are:

Weak consistency (final and consistent), to ensure the user's access speed

The document structure is stored in a way that makes it easier to get data

Built-in Gridfs to support high-capacity storage

Built-in sharding

Third party support Rich (this is the advantage of MongoDB compared to other NoSQL)

Superior performance

The disadvantages of MongoDB compared to non-relational databases:

Transactional operations are not supported

Too much space occupied

No Mature maintenance tools

MongoDB Installation

1. Download MongoDB

wget http://downloads.mongodb.org/linux/mongodb-linux-x86_64-3.2.1.tgz

2. Unzip the tar file

tar zxf mongodb-linux-x86_64-3.2. 1 . tgz MV mongodb-linux-x86_64-3.2. 1//usr/local/mongodb-3.2

3. Creating data files and log files

mkdir -p/usr/local/mongodb-3.2/datamkdir /usr/local/mongodb-3.2/ logs Touch /usr/local/mongodb-3.2/logs/mongod.log

4. Under the user who installed MongoDB, add the following environment variables to directly use the commands in the MongoDB bin directory

Export path= $PATH:/usr/local/mongodb-3.2/bin/

5. Start MongoDB

Mongod--dbpath=/usr/local/mongodb-3.2/data--logpath=/usr/local/mongodb-3.2/logs/mongod.log --logappend  --port=27017&

6. Check if the port is up, port: 27017

grep 27017 TCP         0      0 0.0. 0.0:27017               0.0.  0.0:*                   LISTEN      1897/mongod         Unix  2      [ACC]     STREAM     LISTENING     11098  1897/mongod         /tmp/mongodb-27017. Sock

Started successfully.

7. Connect to the database

# MONGO> Use test

8. Set up MongoDB Auto-start (no permissions)
Add the following command to the/etc/rc.local

Mongod--dbpath=/usr/local/mongodb-3.2/data--logpath=/usr/local/mongodb-3.2/logs/mongod.log-- Logappend  --port=27017&

9. Set up MongoDB Auto-start (with permissions)
Add the following command to the/etc/rc.local

Mongod--dbpath=/usr/local/mongodb-3.2/data--logpath=/usr/local/mongodb-3.2/logs/mongod.log-- Logappend  --port=27017&-auth

10. Add Users

> Use test     // does not exist automatically created > Db.createuser ({User:"admin",pwd :"123456", Roles:[{role:'dbowner', DB:'  userdb'}]})> Use admin    // switch to admin library under > Db.system.users. Find ()  // see which users

MongoDB Connectivity and user management

1) Connect MongoDB:

1: You can run the command MONGO directly into the MongoDB shell in this machine

2: If the MongoDB listener port is not the default 27017, you need to add--port option when connecting, for example

27018

3: Connect remote MongoDB, need to add--host, for example

127.0. 0.1

4: If authentication is set, the user name and password are required when connecting

MONGO-UUSERNAME-PPASSWD    // This is quite like MySQL .

2) MongoDB User Management

1: First MongoDB user is for the library, the establishment of the user must first enter into the corresponding library

2:use test//Switch to test library

3:db.createuser ({User: "admin", pwd: "123456", Roles:[{role: ' Dbowner ', db: ' UserDB '}]})

4:use Admin//Switch to Admin library

5:db.system.users.find ()//list all users, need to switch to admin library

6:show users//View all user under current library

7:db.dropuser (' admin ')//delete user

8: About user roles, refer to document Http://bbs.51cto.com/thread-1146654-1.html

3) database Management
#查看版本
Db.version ()
#显示当前的库 DB
# Toggle/Create Library
Use USERDB//If inventory is switched on, it does not exist to create
#此时show DBS does not see the USERDB, we need to create a collection
Db.createcollection (' Clo1 ')
Again show DBS there is UserDB.
#查看所有数据库
Show DBS
#删除数据库 MyDB
Use MyDB//switch to the library first, and then delete
Db.dropdatabase ()

4) Data Management
Create a Collection

Db.createcollection ("mycol"truetrue614280010000 } )

Syntax: Db.createcollection (name,options)
Name is the name of the collection, options are optional, to configure the parameters of the collection, the parameters are as follows
Capped True/false (optional) If true, the CAP collection is enabled. A capped collection is a fixed-size collection that automatically overwrites the oldest entry when it reaches its maximum size. If True is specified, the dimension parameter needs to be specified as well.
Autoindexid True/false (optional) If true, the default value for automatically creating an index _id field is false.
A size (optional) specifies a maximum size byte cap set. If the cap is true, then you also need to specify this field. Unit B
Max (optional) specifies the maximum number of files allowed in the capping collection.

View Collections

Show collections

Add a document to the collection

Db. Account.insert ({AccountID:2, UserName:"123", Password:"123456  "})  // If the collection does not exist and the data is inserted directly, MongoDB will automatically create the collection to modify the db. Account.update ({AccountID:2},{"$set": {"age  ":+}})

View

Db. Account. Find ()   // View all document db. Account. Find ({AccountID:2})   // Query by Condition Delete the db. Account.remove ({AccountID:2})  // Delete the entire document DB according to the conditions. Account.drop () View the status of the collection  use dbname// enter the corresponding library first, then view the collection status db.printcollectionstats ()

5) Database Performance

Db.stats ()  // View information about the current library db.serverstatus ()   // View the status of the MongoDB server

MongoDB installation Deployment (i)