Redis|Redis 基础概念和命令 Redis基础概念和命令

Redis 是什么

Redis是一种基于键值对(key-value)的NoSQL数据库。

为什么使用Redis 速度快 Redis的时间颗粒度一般是微秒，慢查询的默认值是10 000微秒，即10毫秒。
简单

API
协议：RESP(REdis Serialization Protocol)
源码：5万

怎么使用Redis 命令总览

redis	mysql	作用
redis-cli	mysql	自带客户端
set	insert ... on duplicate key update	新增或者修改
get	select	查询
del	delete from	删除
client list	show processlist	查看连接情况
keys pattern	like	查询对应模式的key列表
info replication	-	是否Master节点
config get requirepass	-	查看密码
expire key seconds	-	设置key的有效期
ttl key	-	查看key的有效期
exists key	-	判断key是否存在

命令讲解 redis-cli
连接指定IP，指定端口的redis服务器
redis-cli -h {host} -p {port} -a {pass}

$./redis-cli -h 127.0.0.1 -p 6379 127.0.0.1:6379> PING (error) NOAUTH Authentication required. 127.0.0.1:6379> AUTH admin.123 OK 127.0.0.1:6379>

./redis-cli -h 127.0.0.1 -p 6379 -a admin.123

key的增删改查
set key value
get key
del key

127.0.0.1:6379> set user_000001 lihairong OK 127.0.0.1:6379> get user_000001 "lihairong" 127.0.0.1:6379> exists user_000001 (integer) 1 127.0.0.1:6379> del user_000001 (integer) 1 127.0.0.1:6379> get user_000001 (nil) 127.0.0.1:6379> exists user_000001 (integer) 0 127.0.0.1:6379>

查询是否master节点

127.0.0.1:6379> info Replication # Replication role:master connected_slaves:0 master_repl_offset:11545465 repl_backlog_active:0 repl_backlog_size:1048576 repl_backlog_first_byte_offset:10496890 repl_backlog_histlen:1048576

127.0.0.1:6379> info Replication # Replication role:slave master_host:127.0.0.x master_port:6379 master_link_status:up master_last_io_seconds_ago:0 master_sync_in_progress:0 slave_repl_offset:11661520052 slave_priority:100 slave_read_only:1 connected_slaves:0 master_repl_offset:0 repl_backlog_active:0 repl_backlog_size:1048576 repl_backlog_first_byte_offset:0 repl_backlog_histlen:0

查看pass
连接并认证可通过redis命令获取

127.0.0.1:6379> config get requirepass

查看服务器的配置文件，一般存放在conf文件夹

[appdeploy@cnsz22vl1101:/app/redis/conf]$cat REDIS_CONF_SVR_01.conf | grep requirepass requirepass "admin.123"

client list

127.0.0.1:6379> client list id=8 addr=127.0.0.1:39978 fd=11 name=sentinel-ca6ff759-cmd age=11843771 idle=0 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=publish id=10 addr=127.0.0.1:30351 fd=13 name=sentinel-2aef8d79-cmd age=11843761 idle=0 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=info id=30711 addr=10.202.x.170:56322 fd=5 name=sentinel-0a0deac6-cmd age=7307073 idle=0 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=publish id=42956 addr=127.0.0.1:17510 fd=10 name=sentinel-2aef8d79-pubsub age=6629498 idle=0 flags=N db=0 sub=1 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=subscribe id=42958 addr=127.0.0.1:59685 fd=14 name=sentinel-ca6ff759-pubsub age=6629498 idle=0 flags=N db=0 sub=1 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=subscribe id=54850 addr=10.202.x.170:27905 fd=6 name=sentinel-0a0deac6-pubsub age=6109432 idle=0 flags=N db=0 sub=1 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=subscribe id=161052 addr=10.202.x.7:37620 fd=7 name= age=8965 idle=3 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=ping id=161055 addr=10.202.x.14:27102 fd=9 name= age=8890 idle=9 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=ping id=161056 addr=10.202.x.13:35310 fd=12 name= age=8889 idle=8 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=ping id=161147 addr=10.202.x.1:56217 fd=15 name= age=202 idle=5 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=ping id=161151 addr=10.202.x.1:56817 fd=8 name= age=5 idle=5 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=ping id=161152 addr=10.202.x.13:29523 fd=16 name= age=4 idle=0 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=32768 obl=0 oll=0 omem=0 events=r cmd=client

key的有效期
ttl key

127.0.0.1:6379> keys service* 1) "serviceArea_20170411" 2) "serviceArea_serviceArea" 3) "serviceArea_20170515" 127.0.0.1:6379> ttl serviceArea_20170515 (integer) 41559 127.0.0.1:6379> quit [appdeploy@cnsz22vl1101:/app/redis/conf]$bc bc 1.06.95 Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc. This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. 41559 / 60 /60 11 ^C (interrupt) Exiting bc. [appdeploy@cnsz22vl1101:/app/redis/conf]$date Mon May 15 12:25:34 CST 2017

info
配置很多，请参看扩展阅读。
缓存更新的套路

Cache Aside Pattern

+--------------------------------------------------+ || |Web Server| || +------------------^^--------------------^^--------+ |||||| hit |||||| |||| return|| |||||| +-------vv---------------------+|| |||| |Cache(Redis)||| return |||| +------------------^^----------+|| |||||| miss|||||| |||| write cache|| |||||| +-------vv------------------------------------------+ || |DB (MYSQL)| || +---------------------------------------------------+