Redis常用命令详解

官方文档：https://redis.io/commands

config 命令用于查看当前redis配置、以及不重启redis服务，动态更改redis配置等

注意：不是所有配置都可以动态修改

127.0.0.1:6379> ConFIG SET maxmemory 8589934592
OK
127.0.0.1:6379> ConFIG GET maxmemory
1) "maxmemory"
2) "8589934592"

127.0.0.1:6379> ConFIG SET requirepass 123456
OK

#奇数行为键，偶数行为值
127.0.0.1:6379> ConFIG GET *
  1) "dbfilename"
  2) "dump.rdb"
  3) "requirepass"
  4) ""
  5) "masterauth"
  6) ""
  7) "cluster-announce-ip"
  8) ""
  9) "unixsocket"
 10) ""
 11) "logfile"
 12) "/var/log/redis/redis.log"
 13) "pidfile"
 14) "/var/run/redis_6379.pid"
 15) "slave-announce-ip"
 16) ""
 17) "replica-announce-ip"
 18) ""
 19) "maxmemory"
 20) "0"
......

显示当前节点redis运行状态信息

127.0.0.1:6379> INFO
# Server
redis_version:5.0.3
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:8c0bf22bfba82c8f
redis_mode:standalone
os:Linux 4.18.0-147.el8.x86_64 x86_64
arch_bits:64
multiplexing_api:epoll
atomicvar_api:atomic-builtin
gcc_version:8.2.1
process_id:725
run_id:8af0d3fba2b7c5520e0981b125cc49c3ce4d2a2f
tcp_port:6379
uptime_in_seconds:18552
......

切换数据库，等于MySQL的use DBNAME指令。

127.0.0.1:6379[15]> SELECT 0
OK
127.0.0.1:6379> SELECT 1
OK
127.0.0.1:6379[1]> SELECT 15
OK
127.0.0.1:6379[15]> SELECT 16
(error) ERR DB index is out of range
127.0.0.1:6379[15]>

查看当前库下的所有key，此命令慎用！

1 27.0.0.1:6379[15]> SELECT 0
OK
127.0.0.1:6379> KEYS *
1) "9527"
2) "9526"
3) "paihangbang"
4) "list1"
127.0.0.1:6379> SELECT 1
OK
127.0.0.1:6379[1]> KEYS *
(empty list or set)
127.0.0.1:6379[1]> 

手动在后台执行RDB持久化操作

#交互式执行
127.0.0.1:6379[1]> BGSAVE
Background saving started

#非交互式执行
[root@centos8 ~]#ll /var/lib/redis/
total 4
-rw-r--r-- 1 redis redis 326 Feb 18 22:45 dump.rdb

[root@centos8 ~]#redis-cli -h 127.0.0.1 -a '123456' BGSAVE
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
Background saving started
[root@centos8 ~]#ll /var/lib/redis/
total 4
-rw-r--r-- 1 redis redis 92 Feb 18 22:54 dump.rdb

返回当前库下的所有key 数量

127.0.0.1:6379> DBSIZE
(integer) 4
127.0.0.1:6379> SELECT 1
OK
127.0.0.1:6379[1]> DBSIZE
(integer) 0

强制清空当前库中的所有key

127.0.0.1:6379[1]> SELECT 0
OK
127.0.0.1:6379> DBSIZE
(integer) 4
127.0.0.1:6379> FLUSHDB
OK
127.0.0.1:6379> DBSIZE
(integer) 0
127.0.0.1:6379>

强制清空当前redis服务器所有数据库中的所有key，即删除所有数据

127.0.0.1:6379> FLUSHALL
OK