Redis key value database [seckill]

One 、Redis- Business - Locking mechanism - seckill

1、redis Business

2、redis Three characteristics of transaction

3、redis Transaction error handling

4、 Examples of transaction conflicts

Two 、Redis Second kill case

Case study ： A commodity is in stock n individual , It is stipulated that in the second kill activity , Each user can buy at most 1 individual .

Second kill successful result ： The number of commodity inventory decreases = Number of successful users

1、ab test

Using tools ab Simulation test , The installation order is as follows ：

yum install httpd-tools

2、 Oversold problem — Optimism lock

3、 High concurrency leads to connection timeout — Connection pool

4、 High concurrency and optimistic locking lead to inventory problems —LUA Script