Monfodb is an open source document database that provides common performance, high availability, auto-scaling, and more
A record in MongoDB is a document, which is a pair of fields and values that make up the structure. A MongoDB document resembles a JSON object, and the value of a field can contain an array of other documents, arrays, and documents. Records are organized into collection, which are equivalent to tables. Reference:
The advantages of using a document are:
documentation for native data objects in many programming languages
inline documents and arrays reduce the cost of joins
Dynamic schema supports smooth polymorphism
Key Features:
Performance:
MongoDB provides high performance data persistence. Especially:
Support for inline data model reduces I/O for database systems
Indexes support quick queries and inline documents and arrays can contain keys
High Availability:
MongoDB offers high availability is replica sets
Auto Fail switch
Data redundancy
Replica set is a set of MONGODB servers that maintain the same data set, provide redundancy, and increase data availability.
Automatic Horizontal scaling:
Horizontal scaling is the kernel feature of MongoDB.
Automatically share distributed data on a cluster
The replica sets provides final consistent reads for low-latency, high-throughput applications.
Installation:
0
Environment
[Email protected] ~]# uname-a
Linux host2 2.6.32-504.3.3.el6.x86_64 #1 SMP Wed Dec 01:55:02 UTC x86_64 x86_64 x86_64 gnu/linux
[Email protected] ~]# cat/etc/issue
CentOS Release 6.5 (Final)
Kernel \ r on an \m
1
Download:
Curl-o http://downloads.mongodb.org/linux/mongodb-linux-x86_64-2.6.7.tgz
2
[Email protected] mongodb]# TAR-ZXVF mongodb-linux-x86_64-2.6.7.tgz
Mongodb-linux-x86_64-2.6.7/readme
Mongodb-linux-x86_64-2.6.7/third-party-notices
mongodb-linux-x86_64-2.6.7/gnu-agpl-3.0
Mongodb-linux-x86_64-2.6.7/bin/mongodump
Mongodb-linux-x86_64-2.6.7/bin/mongorestore
Mongodb-linux-x86_64-2.6.7/bin/mongoexport
Mongodb-linux-x86_64-2.6.7/bin/mongoimport
Mongodb-linux-x86_64-2.6.7/bin/mongostat
Mongodb-linux-x86_64-2.6.7/bin/mongotop
Mongodb-linux-x86_64-2.6.7/bin/mongooplog
Mongodb-linux-x86_64-2.6.7/bin/mongofiles
Mongodb-linux-x86_64-2.6.7/bin/bsondump
Mongodb-linux-x86_64-2.6.7/bin/mongoperf
Mongodb-linux-x86_64-2.6.7/bin/mongod
Mongodb-linux-x86_64-2.6.7/bin/mongos
Mongodb-linux-x86_64-2.6.7/bin/mongo
[Email protected] mongodb]#
3
The planned folder for the copy
[Email protected] mongodb]# MV Mongodb-linux-x86_64-2.6.7/opt/mongodb
4
Configuring Environment variables
[Email protected] ~]# Vi. bash_profile
Path= $PATH:/opt/mongodb/bin
5
The folder where the data resides
[Email protected] mongodb]# mkdir dbdata
6
Enables user Mongod to read and write data in the same folder
[Email protected] mongodb]# useradd-r Mongod
[Email protected] mongodb]# chown Mongod:mongod dbdata/
7
Start
[Email protected] mongodb]# Mongod--dbpath dbdata
2015-02-13t17:56:23.704+0800 [Initandlisten] MongoDB starting:pid=2035 port=27017 dbpath=dbdata 64-bit host=mgdbsvr
2015-02-13t17:56:23.708+0800 [Initandlisten] DB version v2.6.7
2015-02-13t17:56:23.708+0800 [Initandlisten] git version:a7d57ad27c382de82e9cb93bf983a80fd9ac9899
2015-02-13t17:56:23.708+0800 [Initandlisten] Build info:linux build7.nj1.10gen.cc 2.6.32-431.3.1.el6.x86_64 #1 SMP Fri Jan 3 21:39:27 UTC x86_64 boost_lib_version=1_49
2015-02-13t17:56:23.708+0800 [Initandlisten] Allocator:tcmalloc
2015-02-13t17:56:23.708+0800 [Initandlisten] options: {storage: {dbPath: ' Dbdata '}}
2015-02-13t17:56:23.738+0800 [Initandlisten] Journal Dir=dbdata/journal
2015-02-13t17:56:23.741+0800 [Initandlisten] recover:no journal files present, no recovery needed
2015-02-13t17:56:24.520+0800 [Initandlisten] preallocateisfaster=true 13.46
2015-02-13t17:56:25.273+0800 [Initandlisten] Preallocateisfaster=true 12.5
2015-02-13t17:56:27.166+0800 [Initandlisten] preallocateisfaster=true 8.76
2015-02-13t17:56:27.166+0800 [Initandlisten] preallocateisfaster check took 3.423 secs
2015-02-13t17:56:27.167+0800 [Initandlisten] preallocating a journal file dbdata/journal/prealloc.0
2015-02-13t17:56:30.089+0800 [Initandlisten] File preallocator progress:891289600/1073741824 83%
2015-02-13t17:56:31.216+0800 [Initandlisten] preallocating a journal file dbdata/journal/prealloc.1
2015-02-13t17:56:34.070+0800 [Initandlisten] File preallocator progress:629145600/1073741824 58%
2015-02-13t17:56:35.779+0800 [Initandlisten] preallocating a journal file dbdata/journal/prealloc.2
2015-02-13t17:56:38.054+0800 [Initandlisten] File preallocator progress:859832320/1073741824 80%
2015-02-13t17:56:39.630+0800 [Initandlisten] allocating new ns file Dbdata/local.ns, filling with zeroes ...
2015-02-13t17:56:39.762+0800 [Fileallocator] Allocating new datafile dbdata/local.0, filling with zeroes ...
2015-02-13t17:56:39.763+0800 [fileallocator] Creating directory Dbdata/_tmp
2015-02-13t17:56:39.797+0800 [Fileallocator] Done allocating datafile dbdata/local.0, SIZE:64MB, took 0.002 secs
2015-02-13t17:56:39.832+0800 [Initandlisten] Build Index On:local.startup_log properties: {v:1, key: {_id:1}, Name: "_id_", ns: "Local.startup_log"}
2015-02-13t17:56:39.855+0800 [Initandlisten] added index to empty collection
2015-02-13t17:56:39.894+0800 [initandlisten] command Local. $cmd command:create {create: "Startup_log", size:10485760, Capped:true} ntoreturn:1 keyupdates:0 numyields:0 reslen:37 281ms
2015-02-13t17:56:39.897+0800 [Initandlisten] waiting for connections on port 27017
8
Connection, simple to use
[Email protected] ~]# MONGO
MongoDB Shell version:2.6.7
Connecting To:test
#查看当前数据库
> DB
Test
#切到数据库 MyDB
> Use MyDB
Switched to DB MyDB
> DB
MyDB
#用javascript创建两个文档
> j = {name: "MONGO"}
{"Name": "MONGO"}
> k = {x:3}
{"X": 3}
#创建mydb数据库和testdata Collection
> Db.testdata.insert (j)
Writeresult ({"ninserted": 1})
> Db.testdata.insert (k);
Writeresult ({"ninserted": 1})
> Show Collections
System.indexes
TestData
> Db.testdata.find ()
{"_id": ObjectId ("54ddd717d692cfe0bd20d983"), "name": "MONGO"}
{"_id": ObjectId ("54ddd728d692cfe0bd20d984"), "X": 3}
>
>
> Show DBS
Admin (empty)
Local 0.078GB
MyDB 0.078GB
>
> Use HAHADB
Switched to DB hahadb
> Show DBS
Admin (empty)
Local 0.078GB
MyDB 0.078GB
> DB
Hahadb
> j = {name: "MONGO"}
{"Name": "MONGO"}
> Show DBS
Admin (empty)
Local 0.078GB
MyDB 0.078GB
> Db.testdata.insert (j)
Writeresult ({"ninserted": 1})
> Show DBS
Admin (empty)
HAHADB 0.078GB
Local 0.078GB
MyDB 0.078GB
>
> Use MyDB
Switched to DB MyDB
> Show Collections
System.indexes
TestData
>
> Db.testdata.insert (j)
Writeresult ({"ninserted": 1})
> Db.testdata.find ()
{"_id": ObjectId ("54ddd717d692cfe0bd20d983"), "name": "MONGO"}
{"_id": ObjectId ("54ddd728d692cfe0bd20d984"), "X": 3}
{"_id": ObjectId ("54ddda64d692cfe0bd20d986"), "name": "MONGO"}
> Db.testdata.insert (k)
Writeresult ({"ninserted": 1})
>
>
> Db.testdata.find ()
{"_id": ObjectId ("54ddd717d692cfe0bd20d983"), "name": "MONGO"}
{"_id": ObjectId ("54ddd728d692cfe0bd20d984"), "X": 3}
{"_id": ObjectId ("54ddda64d692cfe0bd20d986"), "name": "MONGO"}
{"_id": ObjectId ("54ddda7dd692cfe0bd20d987"), "X": 3}
>
> Db.testdata.find ({x:3})
{"_id": ObjectId ("54ddd728d692cfe0bd20d984"), "X": 3}
{"_id": ObjectId ("54ddda7dd692cfe0bd20d987"), "X": 3}
>
>
> exit;
[Email protected] ~]#
Reference:
docs.mongodb.org/manual/tutorial/install-mongodb-on-linux/
-----------------
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MongoDB Linux Universal Binary Package installation
