Java面试题缓存的相关内容

Java面试题 -缓存

1. 列举⼀个常⽤的Redis客户端的并发模型2. 如何实现⼀个Hashtable?你的设计如何考虑Hash冲突？如何优化?3. 分布式缓存，⼀致性hash⼀致性hash算法：我们的memcached客户端（这⾥我看的spymemcache的源码），使⽤了⼀致性hash算法ketama进⾏数据存储节...

Java 最常见的面试题：怎么保证缓存和数据库数据的一致性？

保证缓存和数据库数据一致性的问题通常被称为“缓存穿透”问题。以下是一些常用的策略：读取数据时先查缓存：当需要获取数据时，首先检查缓存中是否存在。如果存在，直接返回；如果不存在，再去数据库查询，并将结果写入缓存。设置过期时间：对于缓存的每一条数据，都设置一个过期时间。当...

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Java 最常见的面试题：什么是缓存穿透？怎么解决？

缓存穿透是指查询一个一定不存在的数据，由于缓存是不命中时需要从数据库查询，查不到数据则不写入缓存，这将导致这个不存在的数据每次请求都要到数据库去查询，进而给数据库带来压力。为了解决缓存穿透的问题，可以采取以下几种策略：增加校验措施：可以在缓存层和数据库层都添加一些校验措施，例如检查...

【java常见的面试题】什么是缓存雪崩 ? 怎么解决 ?

缓存雪崩/缓存失效指的是大量的缓存在同一时间失效，大量请求落到数据库导致数据库瞬间压力飙升。造成这种现象的原因是，key的过期时间都设置成一样了。解决方案是，key的过期时间引入随机因素

【java常见的面试题】什么是缓存击穿 ? 怎么解决 ?

缓存击穿是指缓存中没有但数据库中有的数据（一般是缓存时间到期），这时由于并发用户特别多，同时读缓存没读到数据，又同时去数据库去取数据，引起数据库压力瞬间增大解决方案 : 热点数据提前预热设置热点数据永远不过期。加锁 , 限流

【java常见的面试题】什么是缓存穿透 ? 怎么解决 ?

缓存穿透是指查询一条数据库和缓存都没有的一条数据，就会一直查询数据库，对数据库的访问压力就会增大，缓存穿透的解决方案有以下2种解决方案：缓存空对象：代码维护较简单，但是效果不好。布隆过滤器：代码维护复杂，效果很好

java初中级面试题(SSM+Mysql+微服务(SpringCloud+Dubbo)+消息队列(RocketMQ)+缓存(Redis+MongoDB)+设计模式+搜索引擎(ES)+JVM

Java 最常见的面试题：说一下 mybatis 的一级缓存和二级缓存？

一级缓存: 基于 PerpetualCache 的 HashMap 本地缓存，其存储作用域为 Session，当 Session flush 或 close 之后，该 Session 中的所有 Cache 就将清空，默认打开一级缓存。二级缓存与一级缓存其机制相同，默认也是采用 PerpetualCa...

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