redis默認有16個數據庫

select 0 OK 127.0.0.1:6379> select 1 OK 127.0.0.1:6379[1]> select 16 ERR invalid DB index 127.0.0.1:6379> select 15 OK 127.0.0.1:6379[15]> move age 0 0 127.0.0.1:6379[15]> select 1 OK 127.0.0.1:6379[1

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