001_ Redis set survival time

001_redis Set the time to live

1、 Use expire To set the key's lifetime

• Survival time is measured in seconds

（1） Set the key name The survival time of is 20s

127.0.0.1:6379> expire name 20
(integer) 1

（2） Effect display

Client prompt ：

2、 In the new key , The default is always valid

127.0.0.1:6379> set name LYM
OK
127.0.0.1:6379> set age 21
OK
127.0.0.1:6379> TTL name
(integer) -1
127.0.0.1:6379> TTL age
(integer) -1

（1） among “-1” Means permanently valid .

3、 summary

• keys： View all that match the template key, It is not recommended to use... In production environment equipment
• del: Delete A designated key
• exists: Judge key Whether there is
• expire: to key Set an expiration date , Valid until key It will be automatically deleted
• ttl: View one key The remaining validity period of