Redis

Strings Commands

Work with Redis strings, the most basic and versatile data type. Learn SET, GET, and atomic operations for caching, counters, and simple key-value storage.

10 commands

Pro Tips

Use 'SET key value EX 3600' to set with expiration in one command - more atomic than SET + EXPIRE.

Use INCR/DECR for atomic counters instead of GET, increment, SET - prevents race conditions.

SETNX (SET if Not eXists) is perfect for distributed locks and ensuring unique operations.

Common Mistakes

Redis strings can hold up to 512MB, but large values impact performance. Consider chunking large data.

Commands

Append to string

$ APPEND key value

Append value to existing string

Decrement value

$ DECR key

Decrement integer value by 1

Get key value

$ GET key

Get string value of a key

Increment value

$ INCR key

Increment integer value by 1

Increment by amount

$ INCRBY key amount

Increment integer value by specific amount

Get multiple keys

$ MGET key1 key2 key3

Get values of multiple keys

Set multiple keys

$ MSET key1 value1 key2 value2

Set multiple key-value pairs atomically

Set key value

$ SET key value

Set string value for a key

Set with expiry (seconds)

$ SETEX key seconds value

Set value with expiration in seconds

Set if not exists

$ SETNX key value

Set value only if key doesn't exist