Duplicate a key in redis

Question

Can I duplicate a key using the redis-cli connected, is there any command predefined in redis or not?

Duplicate FSS_SYSAGENT to FSS_SYSAGENTDuplicate.

10.44.112.213:6403> hgetall FSS_SYSAGENT

1) "SYSTEM_01" 2) "{\"port\":\"4407\",\"ipAddress\":\"10.44.112.213\",\"symbolicName\":\"SYSTEM_01\",\"eventLogEnabled\":\"1110\",\"status\":1,\"wcPort\":\"6029\",\"activeSystem\":\"N\",\"createdBy\":\"\",\"createdDate\":\"2018-11-20 13:11:16\",\"modifiedBy\":\"\",\"modifiedDate\":\"\",\"institution\":\"FSS\",\"delFlag\":0,\"accessID\":0,\"rowCount\":0,\"endCount\":0}"

Answer 1

You can use the DUMP and RESTORE commands to duplicate the key:

1. use the DUMP command to serialize the value of a key.
2. use the RESTORE command to restore the serialized value to another key.

You can wrap these two steps into a Lua script:

-- duplicate.lua
local src = KEYS[1]
local dest = KEYS[2]

local val = redis.call('DUMP', src)
if val == false then
    return 0
else
    -- with RESTORE command, you can also set TTL for the new key, and use the [REPLACE] option to set the new key forcefully. 
    redis.call('RESTORE', dest, 0, val)
    return 1
end

Run the Lua script with redis-cli: ./redis-cli --eval duplicate.lua FSS_SYSAGENT FSS_SYSAGENTDuplicate ,

UPDATE

Since Redis 6.2.0, you can use the COPY command to do the job.