About Redis 2.8

1 RedisIntroduction1.1   Redisdefinition

Redis is an open source , C- written kv storage System,NoSQL database, also known as: non-relational database

1) open-source

2) C language Writing

3) Kv Storage System

4) Nosql, non-relational database

the difference between a Nosql(non-relational) database and a mysql-orcale relational database

Nosql: Storage mode (key/value)

Relational database: stored by (table structure provides primary foreign key association)

Application Scenarios:

Internet, e-commerce

Common NoSQL:

data types supported by MongoDB (document database):Bson

data types supported by Redis (Memory database):string,set,list,hash,sorted-set

HBase(a massive distributed NoSQL database --hadoop ecosystem)

1.2   Redisfeatures

1) Cache:Redis will store the data on the hard disk in memory to provide fast read and write.

Common caches:

Oscache

Ehcache

Memcache

Redis

Cached schema diagram:

Figure 1.(memcache)

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Figure 2.(redis)

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2) rich data type (kv)

data type: The data Type here refers to the type of value ,the type of key is string or byte

3) persistent:Redis also writes data to the hard disk to make a backup (persistent is the reason that Redis is called a database)

About Redis 2.8