我的Redis学习笔记,加案例实战。-MyRedis.zip
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Redis,全称Remote Dictionary Server,是一款高性能的键值对存储系统,常被用作数据库、缓存和消息中间件。Redis以其高效的性能、丰富的数据结构和灵活的数据持久化方案而备受开发者青睐。以下是对Redis的一些核心知识点的详细介绍,以及相关的案例实战。 1. **Redis的数据类型** - **字符串(String)**:最基础的类型,可以存储字符串、数字等。 - **哈希(Hash)**:用于存储键值对集合,适合存储对象。 - **列表(List)**:双向链表,支持头尾插入和删除,适用于实现消息队列。 - **集合(Set)**:无序不重复元素集合,支持并、交、差操作。 - **有序集合(Sorted Set)**:与集合类似,但每个元素都有一个分数,用于排序。 2. **Redis的操作命令** - 基本操作如`SET`、`GET`、`DEL`、`INCR`等。 - 高级操作如`LPOP`、`RPOP`(列表)、`SADD`、`SMEMBERS`(集合)、`ZADD`、`ZRANGE`(有序集合)。 - 事务(Transaction):`MULTI`、`EXEC`用于原子操作。 - Lua脚本支持:使用`EVAL`或`EVALSHA`执行自定义逻辑。 3. **Redis的持久化策略** - **RDB(快照)**:在特定时间点生成数据库的完整快照,适合大规模数据恢复。 - **AOF(Append Only File)**:记录所有写操作命令,重启时重放日志恢复数据,更安全但性能稍低。 - **混合持久化**:结合RDB和AOF,兼顾性能和数据安全性。 4. **Redis的主从复制** - 数据库的实时备份,提高可用性和容错性。 - 多个从节点可分散读请求,减轻主节点压力。 - 支持半同步复制和全同步复制,平衡延迟和一致性。 5. **Redis集群(Cluster)** - 分布式存储,自动分片,提升扩展性。 - 通过槽(slot)分配数据,支持动态扩容和缩容。 - 节点间通信和故障转移,保证高可用性。 6. **Redis的过期策略** - 设置键的生存时间(TTL),自动清理过期数据。 - 定时删除、惰性删除、定期删除三种策略组合,平衡内存使用和CPU开销。 7. **案例实战** - 使用Redis做缓存:将数据库中的热点数据缓存到Redis,减少数据库读取,提高响应速度。 - 实现消息队列:利用`LPUSH/RPOP`操作,构建先进先出(FIFO)的消息队列。 - 社交网络的点赞/关注统计:利用有序集合,快速获取用户点赞或关注的排名。 - 分布式锁:通过设置过期时间的键来实现简单分布式锁。 8. **最佳实践** - 适当的数据结构选择:根据需求选择合适的数据类型,如用Set代替List来避免重复元素。 - 控制内存使用:监控内存使用情况,避免OOM(Out Of Memory)异常。 - 使用连接池:减少频繁的连接创建和关闭,提高性能。 - 优化查询:尽量减少全量扫描,避免阻塞。 通过深入学习这些知识点,并结合实际案例进行练习,你将能够更好地理解和运用Redis,为你的项目带来高效的数据处理能力。
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