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 * Redis中所说的数据结构是针对key-value中的value而言的。
 * 主要的结构包括String、哈希表、列表、集合等等
 * 在redis中存在16个库,涉及到后期的集群搭建只能使用0号库最为方便 
 <>查看所有键(支持通配符)
keys * keys S* 
 <>返回当前数据库中的键总数
dbsize
 使用该方式调用的是redis内置的键总数变量,时间复杂度O(1)
 <>查看键是否存在
exists
 <>删除键
 <>键过期
 * reds支持设置键过期时间,到期自动删除,单位为秒
 * 查看过期时间 pttl的查询可以精确到毫秒级别 
 <>设置键在毫秒的时间后过期
 <>设置在毫秒时间戳之后过期
 <>persist命令可以将已经设置过期时间的key,过期时间删除
 <>对于字符串String类型的键,重新设置值的时候过期时间会丢失
 <>redis中不支持对value内部的结构进行单独的过期时间限制,例如不能对一个list中某一个元素单独设置过期时间。
 <>查看键的数据结构类型
 <>随机返回一个键
 <>键中已经存在某个值,重命名某个键那么其中的值也会被覆盖
 * 问题避免
 <>Redis键名命名
 * 不宜过长,避免浪费内存资源
 * 可以使用业务名:对象名:id的方式