Commands

• All data is accessible via String keys

• Commands are atomic

Basic Commands

Sets value.

SET key value

Returns value.

GET key

Removes a value.

DEL key

Returns value and then updates the key with a new value.

GETSET key value

Set value if it does not exist.

SETNX key value

There are other commands that work for multiple values. They have M prefix. Just DEL works for multiple by default.

MSET
MGET
MSETNX
DEL

Expiration Commands

Expires key after given number of seconds.

EXPIRE key seconds

Expire at given time.

EXPIREAT key timestamp

Set value with a timestamp in a single statement.

SETEX key seconds value

Get expiration date.

TTL key

Remove expiration time and keep the key persistent.

PERSIST key

Other Commands

Increase value without retrieving it first. Good for counters.

INCR operation

Get part of a large string.

GETRANGE operations
SETRANGE operations