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HomeDatabaseMysql TutorialRedis全内存运行

在某些使用场景中,我们并不需要使用Redis的持久化,反而需要发挥redis的内存数据库特性,实现完全内存运行,达到需要的高性能。

在某些使用场景中,我们并不需要使用Redis的持久化,反而需要发挥redis的内存数据库特性,实现完全内存运行,达到需要的高性能。

Redis 本身支持持久化,通过在一定时间间隔或触发操作,将内存中的数据同步到磁盘来保证持久化。Redis 支持两种持久化方式,一种是  Snapshotting(快照),保存为dump.rdb文件,也是默认方式,另一种是 Append-only file(缩写aof)的方式,保存为 .aof 文件。

Snapshot 快照 通过save或者bgsave命令通知redis做一次快照持久化。save操作是在主线程中保存快照的,由于redis是用一个主线程来处理所有客户端的请求,这种方式会阻塞所有客户端请求。所以不推荐使用。另一点需要注意的是,每次快照持久化都是将内存数据完整写入到磁盘一次,并不是增量的只同步增量数据。如果数据量大的话,写操作会比较多,必然会引起大量的磁盘IO操作,可能会严重影响性能。

在默认的快照 rdb保存方式中,redis.conf 里面的配置如下

save 900 1  #900秒内如果超过1 个key 被修改,则发起快照保存
save 300 10  #300秒内容如超过10个key 被修改,则发起快照保存
save 60 10000

如果我们需要关闭快照,只需要将这几行注释了,然后重启 redis 即可。

如果是正在运行的实例,可以使用 redis-cli的命令

# 查看当前配置
config get save
# 关闭快照
config set save ""

来在线更新配置,输出OK表示设置成功。

AOF  比快照方式有更好的持久化性,是由于在使用aof 持久化方式时, redis 会将每一个收到的写

命令都通过write函数追加到文件中(默认是appendonly.aof) 。当redis 重启时会通过重新执行文件中

保存的写命令来在内存中重建整个数据库的内容

默认配置如下:
 
appendonly yes      //启用日志追加持久化方式
#appendfsync always //每次收到写命令就立即强制写入磁盘,最慢的,但是保证完全的持久化,不推荐使用
appendfsync everysec //每秒钟强制写入磁盘一次,在性能和持久化方面做了很好的折中,,推荐
#appendfsync no //完全依赖操作系统,性能最好,持久化没保证

我们需要更新配置文件为:

appendfsync no

在线更新配置使用

# 查看当前配置
config get appendfsync
# 关闭快照
config set appendfsync no

通过这两个配置,redis就可以完全在内存运行。

如果想手动进行持久化,可以使用Redis的 bgsave 和 bgrewriteaof 来手动进行持久化。

Ubuntu 14.04下Redis安装及简单测试

Redis集群明细文档

Ubuntu 12.10下安装Redis(图文详解)+ Jedis连接Redis

Redis系列-安装部署维护篇

CentOS 6.3安装Redis

Redis安装部署学习笔记

Redis配置文件redis.conf 详解

Redis 的详细介绍:请点这里
Redis 的下载地址:请点这里

本文永久更新链接地址:

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