Keys

Commands for managing keys, expiration, and key metadata.

Commands

Command	Syntax	Description
DEL	DEL key [key ...]	Delete one or more keys
EXISTS	EXISTS key [key ...]	Check if keys exist
TYPE	TYPE key	Get key type
EXPIRE	EXPIRE key seconds	Set TTL in seconds
EXPIREAT	EXPIREAT key timestamp	Set expiration as Unix timestamp
PEXPIRE	PEXPIRE key milliseconds	Set TTL in milliseconds
PEXPIREAT	PEXPIREAT key timestamp	Set expiration as Unix milliseconds
TTL	TTL key	Get remaining TTL in seconds
PTTL	PTTL key	Get remaining TTL in milliseconds
PERSIST	PERSIST key	Remove expiration
KEYS	KEYS pattern	Find keys by glob pattern
SCAN	SCAN cursor [MATCH pattern] [COUNT count]	Iterate keys
DBSIZE	DBSIZE	Get key count in current database
FLUSHDB	FLUSHDB	Delete all keys in current database

Examples

Delete Keys

127.0.0.1:6379> SET key1 "value1"
OK
127.0.0.1:6379> SET key2 "value2"
OK
127.0.0.1:6379> DEL key1 key2
(integer) 2

Check Existence

127.0.0.1:6379> SET mykey "Hello"
OK
127.0.0.1:6379> EXISTS mykey
(integer) 1
127.0.0.1:6379> EXISTS nosuchkey
(integer) 0
127.0.0.1:6379> EXISTS key1 key2 key3
(integer) 2  # Returns count of existing keys

Expiration

# Set expiration
127.0.0.1:6379> SET mykey "Hello"
OK
127.0.0.1:6379> EXPIRE mykey 60
(integer) 1

# Check remaining TTL
127.0.0.1:6379> TTL mykey
(integer) 58

# Remove expiration
127.0.0.1:6379> PERSIST mykey
(integer) 1
127.0.0.1:6379> TTL mykey
(integer) -1  # No expiration

Find Keys

# Find all keys matching pattern
127.0.0.1:6379> KEYS user:*
1) "user:1"
2) "user:2"
3) "user:100"

# Find keys with single character wildcard
127.0.0.1:6379> KEYS user:?
1) "user:1"
2) "user:2"

Scan Keys (Recommended for Large Datasets)

127.0.0.1:6379> SCAN 0 MATCH user:* COUNT 10
1) "15"  # Next cursor
2) 1) "user:1"
   2) "user:2"
   3) "user:3"

# Continue with returned cursor
127.0.0.1:6379> SCAN 15 MATCH user:* COUNT 10
1) "0"  # Cursor 0 = iteration complete
2) 1) "user:4"
   2) "user:5"

Key Type

127.0.0.1:6379> SET mystring "hello"
OK
127.0.0.1:6379> LPUSH mylist "world"
(integer) 1
127.0.0.1:6379> TYPE mystring
string
127.0.0.1:6379> TYPE mylist
list

Library Mode (Rust)

use redlite::Db;
use std::time::Duration;

let db = Db::open("mydata.db")?;

// Delete keys
db.del(&["key1", "key2"])?;

// Check existence
let exists = db.exists(&["mykey"])?;  // Returns count

// Set expiration
db.expire("mykey", Duration::from_secs(60))?;

// Get TTL
let ttl = db.ttl("mykey")?;  // Returns Option<i64>

// Find keys
let keys = db.keys("user:*")?;

// Get key type
let key_type = db.key_type("mykey")?;  // Returns KeyType enum