Redis Keyspace 정보 확인 및 가용한 Key List 확인하기

        kent@rtest1:~/redis-4.0.2/src$ ./redis-cli INFO | grep ^db
        db0:keys=4,expires=0,avg_ttl=0

        kent@rtest1:~/redis-4.0.2/src$ ./redis-cli INFO keyspace
        # Keyspace
        db0:keys=4,expires=0,avg_ttl=0

        kent@rtest1:~/redis-4.0.2/src$ ./redis-cli keys "*"
        1) "job_results:1234"
        2) "job_status:1234"
        3) "a1234"
        4) "1234"