值Redis百思不得其解实现随机数取值（redis随机取）

Long accustomed to developing databases with SQL,it often doesn’t even dawn on us to use the non-traditional database Redis.The appeal of this database is the ease with which you can quickly retrieve data,and in this article I will be discussing how to use redis to achieve random number retrieval.

To start off,we will assume we have a database contning a list of numbers between 1 and 1000.So our first step is to determine the size of the list,using the LLEN command:

>LLEN numbers

1000

The next step is to use the RANDOMKEY command to randomly select one of the keys from the list.In this example, the “numbers” list has been chosen as the contner for our random number.

>RANDOMKEY numbers

key-23

Now we have the random key,we can use the GET command to retrieve the random number associated with that key.

>GET key-23

520

So that’s how easy it is to use redis to retrieve a random number.In addition to being easy to use,redis offers scalability and high avlability,as it runs on a cluster of servers to ensure data redundancy.It also offers other features such as master-slave replication, in-memory data storage and the ability to perform operations such as sorting on the server.Considering all these benefits,it is definitely worth considering utilizing Redis in your applications.

To summarise, Redis is an excellent choice for applications which require fast,random data retrieval.The easy to use commands,high avlability and scalability make redis a great choice for any application.