tutorials

Syntax

Redis keys commands are used for managing keys in redis. Syntax for using redis keys commands is shown below:

redis 127.0.0.1:6379> COMMAND KEY_NAME

Related Commands

• DEL key

This command deletes the key, if exists

• DUMP key

This command returns a serialized version of the value stored at the specified key.

• EXISTS key

This command checks whether the key exists or not.

• EXPIRE key seconds

Expires the key after the specified time

1, if timeout is set for key.

0, if key does not exists or timeout could not set.

redis 127.0.0.1:6379> EXPIRE tutorialspoint 60
(integer) 1

• EXPIREAT key timestamp

Expires the key after the specified time. Here time is in Unix timestamp format

redis 127.0.0.1:6379> EXPIREAT tutorialspoint 1293840000
(integer) 1
EXISTS tutorialspoint
(integer) 0

• PEXPIRE key milliseconds

Set the expiry of key in milliseconds

In the above example 5 seconds time is set for the key tutorialspoint. After 5 seconds key will expire automatically.

redis 127.0.0.1:6379> PEXPIRE tutorialspoint 5000
(integer) 1

• KEYS pattern

Find all keys matching the specified pattern

redis 127.0.0.1:6379> KEYS tutorial*
redis 127.0.0.1:6379> KEYS *

• MOVE key db

Move a key to another database

1, if key is moved. 0, if key is not moved.

• PERSIST key

Remove the expiration from the key

1, if timeout is removed from key. 0, if key does not exist or does not have an associated timeout.

redis 127.0.0.1:6379> EXPIRE tutorial1 60
1) (integer) 1
redis 127.0.0.1:6379> TTL tutorial1
1) (integer) 60
redis 127.0.0.1:6379> PERSIST tutorial1
1) (integer) 1
redis 127.0.0.1:6379> TTL tutorial1
1) (integer) -1

• PTTL key

Get the remaining time in keys expiry in milliseconds.

TTL in milliseconds.

-1, if key does not have expiry timeout.

-2, if key does not exist.

redis 127.0.0.1:6379> EXPIRE tutorialname 1
1) (integer) 1
redis 127.0.0.1:6379> PTTL tutorialname
1) (integer) 999

• TTL key

Get the remaining time in keys expiry.

TTL in milliseconds.

-1, if key does not have expiry timeout.

-2, if key does not exist.

redis 127.0.0.1:6379> EXPIRE tutorialname 60
1) (integer) 1
redis 127.0.0.1:6379> TTL tutorialname
1) (integer) 59

• RANDOMKEY

Return a random key from redis

String, a random key or nil, if database is empty.

• RENAME key newkey

Change the key name

String reply OK or error.

It returns an error if old key and new key names are equal or when key does not exist. If new key already exist, then it overwrite the existing key.

redis 127.0.0.1:6379> RENAME tutorial1 new-tutorial
OK

• RENAMENX key newkey

Rename key, if new key doesn’t exist

Integer reply 1 or 0.

1, if key is renamed to new key.

0, if new key already exist.

redis 127.0.0.1:6379> RENAMENX tutorial1 new-tutorial
(integer) 1
redis 127.0.0.1:6379> RENAMENX tutorial2 new-tutorial
(integer) 0

• TYPE key

Return the data type of value stored in key.