优雅删除Redis中以xx开头的key-Toy模板网

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1、暴力删除

使用keys * 扫描所有的key，然后批量删除。key较多时，会阻塞redis，生产环境中需要慎重，适合并发小，keys数量少的场景。

关键命令：

docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0 keys "a*" |xargs redis-cli -h 172.17.0.17 -p 6379 -n 0 del"

[root@VM-0-17-centos ~]# 
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  set a1 1"
OK
[root@VM-0-17-centos ~]# 
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  set a2 2"
OK
[root@VM-0-17-centos ~]# 
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  set a3 3"
OK
[root@VM-0-17-centos ~]# 
[root@VM-0-17-centos ~]# 
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  keys "a*""
1) "a1"
2) "a2"
3) "a3"
[root@VM-0-17-centos ~]# 
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  keys "a*" |xargs redis-cli -h 172.17.0.17 -p 6379 -n 0 del"
(integer) 3
[root@VM-0-17-centos ~]# 
[root@VM-0-17-centos ~]# 
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  keys "a*""
(empty array)

###如果需要密码，可以加上-a参数

2、优雅删除

关键命令：

docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0 --scan --pattern "a*" |xargs -n 1000 -r redis-cli -h 172.17.0.17 -p 6379 -n 0 del"

[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  set a1 1"
OK
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  set a2 2"
OK
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  set a3 3"
OK
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  --scan --pattern "a*""
a2
a1
a3
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0 --scan --pattern "a*" |xargs -N 1000 redis-cli -h 172.17.0.17 -p 6379 -n 0 del"
xargs: unrecognized option: N
BusyBox v1.31.1 () multi-call binary.

Usage: xargs [OPTIONS] [PROG ARGS]

Run PROG on every item given by stdin

        -0      Input is separated by NULs
        -a FILE Read from FILE instead of stdin
        -r      Don't run command if input is empty
        -t      Print the command on stderr before execution
        -p      Ask user whether to run each command
        -E STR,-e[STR]  STR stops input processing
        -I STR  Replace STR within PROG ARGS with input line
        -n N    Pass no more than N args to PROG
        -s N    Pass command line of no more than N bytes
        -P N    Run up to N PROGs in parallel
        -x      Exit if size is exceeded
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0 --scan --pattern "a*" |xargs -n 1000 -r redis-cli -h 172.17.0.17 -p 6379 -n 0 del"
(integer) 3
[root@VM-0-17-centos ~]# 
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  --scan --pattern "a*""
[root@VM-0-17-centos ~]# 
###如果需要密码，可以加上-a参数

备注：

xargs -n 参数的作用，表示每次执行的参数数量文章来源地址https://www.toymoban.com/news/detail-518322.html


### 注意-n参数，可以每次删除适量的

[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  set a1 3"
OK
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  set a2 3"
OK
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0  set a3 3"
OK
[root@VM-0-17-centos ~]# docker run --rm --name redis-cli -it goodsmileduck/redis-cli sh -c "redis-cli -h 172.17.0.17 -p 6379 -n 0 --scan --pattern "a*" |xargs -n 1 -r redis-cli -h 172.17.0.17 -p 6379 -n 0 del"
(integer) 1
(integer) 1
(integer) 1

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