Redis, one of the most popular open-source in-memory databases, provides a simple and straightforward way to delete all keys with a given prefix. This can be done with the help of the **KEYS** and **DEL** commands. First, use **KEYS** to find all keys with a given prefix. This command will search all keys within the given database and return all matching keys in an array. Next, use **DEL** to delete all these keys. For example, if you wanted to delete all
Delete all the keys by a given prefix in a Redis cluster.
Let’s ping our Redis instance
redis-cli -h myhost.com -p 6379 ping
Set some keys
redis-cli -h myhost.com -p 6379 SET dev1 "val1"
redis-cli -h myhost.com -p 6379 SET dev2 "val2"
redis-cli -h myhost.com -p 6379 SET dev3 "val3"
Get one key
redis-cli -h myhost.com -p 6379 KEYS dev1
Delete one key
redis-cli -h myhost.com -p 6379 DEL dev1
Now let’s go with our massive deletion algorithm but before making any deletion let’s test the algorithm without making changes.
for key in `echo 'KEYS dev*' | redis-cli -c -h myhost.com -p 6379 | awk '{print $1}'`
do echo KEYS $key
done | redis-cli -c -h myhost.com -p 6379
And then when you are sure, go ahead with the deletion
for key in `echo 'KEYS dev*' | redis-cli -c -h myhost.com -p 6379 | awk '{print $1}'`
do echo DEL $key
done | redis-cli -c -h myhost.com -p 6379
In case you are not using a cluster just remove the -c options from redis-cli
