The first to recognize NoSQL

NoSQL Introduction

NoSQL, or not-only SQL, refers to non-relational databases

• relational database to ensure the integrity and relevance of data
  ID Name Age Salary
  
• Non-relational database, which does not guarantee the integrity and correlation of data, and has high efficiency in reading and writing data.
  Guaranteed key value Storage: Key=>value
  Set Name value
  Get Name

NoSQL Database Classification

Key values database: Redis, Memcache
List-type database: HBase (Java)
Document Type database: MongoDB

About Redis

Redis is an open source API that is written in ANSI C, supports the web, can be persisted in memory, key-value databases, and provides multiple languages.

Italian engineer, about 2000 years, to develop a project needs to do a real-time statistical function, but feel that MySQL read and write performance is poor, so decided to write a database, in order to improve read and write speed, in memory to open a space to read and write, so as to improve the efficiency of reading and writing data, It was later sponsored by VMware.

Linux System---> memory (Redis read-write)----> disk (file)-----> Connect MySQL database----Read-write table

Redis provides a solution for persisting storage that stands out from the many in-memory cache databases. Memcache is also stored in memory, but each time the operating system is restarted, the data in memory is lost

Redis Application Scenarios

Because Redis is memory-based, it is recommended to use Redis storage for high read/write efficiency and small data volumes
For example:

• Cache string (small amount of data)
• Task Queue (order generation)
• Leaderboard Program (sorted set ordered set)
• Session storage under Distributed environment

The first to recognize NoSQL