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Redis设计与实现学习笔记
Redis设计与实现学习笔记
学习笔记
-
Redis设计与实现
-链表
出了链表键之外,发布
与
订阅、慢查询、监视器等功能也用到了链表,
Redis
服务器本身还使用链表来保存多个客户端的状态信息,以及使用链表来构建客户端输出缓冲区(Output buffer)3.1 链表和链表节点的
实现
Redis
的链表
实现
的特性总结如下:...
学习笔记
-
Redis设计与实现
-事件
虽然文件事件处理器以单线程方式运行,但通过使用I/O多路复用程序来监听多个套接字,文件事件处理器既
实现
了高性能的网络通信模型,又可以很好地
与Redis
服务器中其他同样以单线程方式运行地模块进行对接,这保持了
Redis
内部单线程
设计
地...
学习笔记
-
Redis设计与实现
-数据库
9.6.2 定期删除策略的
实现
过期键的定期删除策略由
redis
.c/activeExpireCycle函数
实现
,每当
Redis
的服务器周期性操作
redis
.c/serverCron函数执行时,activeExpireCycle函数就会被调用,它在规定的时间内,分多次遍历服务器中的各个数据库,...
学习笔记
-
Redis设计与实现
-字典
4.1 字典的
实现
Redis
的字典使用哈希表作为底层
实现
,一个哈希表里面可以有多个哈希表节点,而每个哈希表节点就保存了字典中的一个键值对。4.1.1 哈希表 table属性是一个数组,数组中的每个元素都是一个指向dict.h/dictEntry结构的指针,每...
学习笔记
-
Redis设计与实现
-对象
8.1 对象的类型
与
编码 8.1.1 类型 8.1.2 编码和底层
实现
8.2字符串对象 字符串对象的编码可以是int、raw或者embstr。如果字符串对象保存的是一个字符串值,并且这个字符串值的长度大于32字节(存疑,我电脑上是39字节),那么字符串对象将...
《
Redis设计与实现
》
学习笔记
-发布
与
订阅、事务、慢查询日志
发布
与
订阅
Redis
通过发布订阅提供一对多甚至是多对多的节点消息通信,发布订阅由PUBLISH、SUBSCRIBE、PSUBSCRIBE、PUBSUB等命令组成。SUBSCRIBE命令:订阅某频道,在
redis
Server结构中通过pubsub_channels字典属性保存当前服务器所有频道...
学习笔记
-
Redis设计与实现
-跳跃表
Redis
使用跳跃表作为有序结合键的底层
实现
之一,如果一个有序集合包含的元素数量比较多,又或者有序集合中元素的成员(member)是比较长的字符串时,
Redis
就会使用跳跃表来作为有序集合见的底层
实现
。5.1 跳跃表的
实现
zskiplist结构,包含...
学习笔记
-
Redis设计与实现
-AOF持久化
AOF(Append Only File)
与
RDB持久化通过保存数据库中的键值对来记录数据库状态不同,AOF持久化是通过保存
Redis
服务器所执行的写命令来记录数据库状态的。11.1AOF持久化的
实现
AOF持久化功能的
实现
可以分为命令追加(append)、文件写入、...
学习笔记
-
Redis设计与实现
-RDB持久化
TYPE记录了value的类型,长度为1字节:
REDIS
_RDB_TYPE_STRING
REDIS
_RDB_TYPE_LIST
REDIS
_RDB_TYPE_SET
REDIS
_RDB_TYPE_ZSET
REDIS
_RDB_TYPE_HASH
REDIS
_RDB_TYPE_LIST_ZIPLIST
REDIS
_RDB_TYPE_SET_INTSET
REDIS
_RDB_TYPE_ZSET_ZIPLIST ...
学习笔记
-
Redis设计与实现
-压缩列表
压缩列表(ziplist)是列表键和哈希键的底层
实现
之一。7.1 压缩列表的构成 压缩列表是
Redis
为了节约内存而开发的,是由一系列特殊编码的连续内存块组成的顺序型(sequential)数据结构。一个压缩列表可以包含任意多个节点(entry),每个...
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观看发布会
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云数据库Redis产品升级,全球多活,冷热分离混合存储,多线程性能增强,
观看发布会
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云数据库 Redis 版
兼容Redis协议标准的、提供持久化的内存数据库服务,基于高性价比的单节点架构、高可靠双机热备架构及可无缝扩展的集群架构,满足纯缓存业务、高读写性能场景及容量需弹性变配的业务需求。
了解详情
管理控制台
在线咨询
最新活动
Redis 19.9元/年
数据库专场优惠
快速入门
帮助文档
快速入门
最佳实践
电商行业业务上云
数据库客户案例合集
产品推荐
云数据库PolarDB
云原生数据仓库MySQL
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云数据库Redis产品升级,全球多活,冷热分离混合存储,多线程性能增强,
观看发布会
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云数据库Redis产品升级,全球多活,冷热分离混合存储,多线程性能增强,
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云数据库 Redis 版
兼容Redis协议标准的、提供持久化的内存数据库服务,基于高性价比的单节点架构、高可靠双机热备架构及可无缝扩展的集群架构,满足纯缓存业务、高读写性能场景及容量需弹性变配的业务需求。
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Redis 19.9元/年
数据库专场优惠
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