Mongodb

http://www.mongodb.org/

https://docs.mongodb.org/v3.0/

http://docs.mongodb.org/getting-started/shell/

Why Nosql?

http://www.couchbase.com/nosql-resources/what-is-no-sql

https://www.mongodb.com/nosql-explained

http://wiki.jikexueyuan.com/project/mongodb/

第一天

Install MongoDB and basic operation

http://www.cnblogs.com/huangxincheng/archive/2012/02/18/2356595.html

32bit的mongodb最大只能存放2G的数据，64bit就没有限制。

mongodb中有三元素：数据库，集合，文档，其中“集合”就是对应关系数据库中的“表”，“文档”对应“行”。

启动mongodb:

C:\Program Files\MongoDB\Server\3.0\bin>mongod –dbpath=D:\mongoDB\db01

–httpinterface | nohttpinterface

MongoDB disables the HTTP interface by default.

http://docs.mongodb.org/manual/reference/program/mongod/#cmdoption–httpinterface

mongodb client shell

mongo

第二天

CRUD Details

http://www.cnblogs.com/huangxincheng/archive/2012/02/19/2357846.html

CRUD

insert() | find() |update()| remove()

Query selection operator

https://docs.mongodb.org/v3.0/reference/operator/query/#query-selectors

What are indexs in the db and usage?

Some shell commands:

db.getCollectionNames();

show collections

show dbs

db

use dbname

show tables

第三天

聚合 and 游标

http://www.cnblogs.com/huangxincheng/archive/2012/02/21/2361205.html

db.person.count()

db.person.count({“city”:”sh”})

db.person.distinct(“city”)

db.person.group()

http://blog.csdn.net/h70614959/article/details/7780227

https://docs.mongodb.org/manual/reference/command/group/

mapReduce in mongodb

http://www.mongovue.com/2011/04/05/how-to-perform-mapreduce-operations-in-mongovue-a-step-by-step-guide/

http://www.mongovue.com/2010/11/03/yet-another-mongodb-map-reduce-tutorial/

http://blog.csdn.net/zzq900503/article/details/8510030

What is map reduce?

http://www.csdn.net/article/2013-01-07/2813477-confused-about-mapreduce

http://ayende.com/blog/4435/map-reduce-a-visual-explanation

https://docs.mongodb.org/manual/reference/command/mapReduce/#mapreduce-map-cmd

http://www.open-open.com/lib/view/open1329455491750.html

聚合函数

http://www.infoq.com/cn/articles/implementing-aggregation-functions-in-mongodb

为什么要创建view database?

启动mongodb遇到如下异常：

exception in initAndListen: 12596 old lock file, terminating

解决方法

1.删除data目录中的.lock文件

2.mongod.exe –repair

3.启动mongod就可以了

第四天

索引

http://www.cnblogs.com/huangxincheng/archive/2012/02/29/2372699.html

db.collection.find().explain()

cursor.explain()

db.person.find({“name”:”hxc”+10000}).explain(‘allPlansExecution’)

Collection Scan



db.person.ensureIndex({“name”:1})

db.person.find({“name”: “hxc”+10000}).explain(“executionStats”)



唯一索引

组合索引

db.person.getIndexes()

db.person.dropIndexes(“name_1”)

索引会降低CUD这三种操作的性能，因为这玩意需要实时维护，所以啥问题都要综合考虑一下。

Mongodb主要内容：

1.Index

https://docs.mongodb.org/v3.0/indexes/