Redis, an in-memory data structure store, is renowned for its speed and versatility. This cheatsheet compiles essential Redis commands that help you manage your database effectively, whether you’re a beginner or an experienced user.
1. DEL |
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| Usage: | `DEL key` | |
| Description: | Deletes the specified key. If the key does not exist, it is ignored. | |
| Example: | `DEL mykey` | |
2. DUMP |
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| Usage: | `DUMP key` | |
| Description: | Serializes the value stored at the specified key, returning it as a binary safe string. | |
| Example: | `DUMP mykey` | |
3. EXISTS |
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| Usage: | `EXISTS key` | |
| Description: | Checks if a key exists in the database, returning 1 if it does and 0 if it doesn’t. | |
| Example: | `EXISTS mykey` | |
4. EXPIRE |
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| Usage: | `EXPIRE key seconds` | |
| Description: | Sets a timeout on the specified key, after which it will be automatically deleted. | |
| Example: | `EXPIRE mykey 60` | |
5. EXPIREAT |
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| Usage: | `EXPIREAT key timestamp` | |
| Description: | Sets a timeout on the specified key using an absolute Unix timestamp. | |
| Example: | `EXPIREAT mykey 1633072800` | |
6. KEYS |
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| Usage: | `KEYS pattern` | |
| Description: | Returns all keys matching a specified pattern (note: can be slow on large datasets). | |
| Example: | `KEYS user:*` | |
7. MIGRATE |
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| Usage: | `MIGRATE host port key destination-db timeout` | |
| Description: | Transfers an item from one Redis instance to another. | |
| Example: | `MIGRATE 192.168.1.1 6379 mykey 1 5000` | |
8. MOVE |
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| Usage: | `MOVE key db` | |
| Description: | Moves a key from the current database to a specified database. | |
| Example: | `MOVE mykey 1` | |
9. OBJECT |
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| Usage: | `OBJECT subcommand [arguments]` | |
| Description: | Inspects various aspects of an item (e.g., its encoding, ID). | |
| Example: | `OBJECT ENCODING mykey` | |
10. PERSIST |
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| Usage: | `PERSIST key` | |
| Description: | Removes the expiration from a key, making it persistent. | |
| Example: | `PERSIST mykey` | |
11. PEXPIRE |
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| Usage: | `PEXPIRE key milliseconds` | |
| Description: | Sets a timeout on the specified key in milliseconds. | |
| Example: | `PEXPIRE mykey 1500` | |
12. PEXPIREAT |
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| Usage: | `PEXPIREAT key milliseconds-timestamp` | |
| Description: | Sets a timeout on the specified key using a millisecond timestamp. | |
| Example: | `PEXPIREAT mykey 1633072800000` | |
13. PTTL |
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| Usage: | `PTTL key` | |
| Description: | Returns the remaining time to live of a key in milliseconds. | |
| Example: | `PTTL mykey` | |
14. RANDOMKEY |
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| Usage: | `RANDOMKEY` | |
| Description: | Returns a random key from the current database. | |
| Example: | `RANDOMKEY` | |
15. RENAME |
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| Usage: | `RENAME oldkey newkey` | |
| Description: | Renames a key. If the new key already exists, it will be overwritten. | |
| Example: | `RENAME mykey newkey` | |
16. RENAMENX |
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| Usage: | `RENAMENX oldkey newkey` | |
| Description: | Renames a key only if the new key does not already exist. | |
| Example: | `RENAMENX mykey newkey` | |
17. RESTORE |
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| Usage: | `RESTORE key ttl serialized-value` | |
| Description: | Deserializes a value into a key, setting its expiration. | |
| Example: | `RESTORE mykey 0 serialized_value` | |
18. SCAN |
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| Usage: | `SCAN cursor [MATCH pattern] [COUNT count]` | |
| Description: | Iterates over keys in the database, allowing for pattern matching. | |
| Example: | `SCAN 0 MATCH user:* COUNT 10` | |
19. SORT |
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| Usage: | `SORT key [BY pattern] [GET pattern] [ASC|DESC] [LIMIT offset count] [STORE destination]` | |
| Description: | Retrieves or stores a sorted copy of a list, set, or sorted set. | |
| Example: | `SORT mylist ASC` | |
20. TTL |
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| Usage: | `TTL key` | |
| Description: | Returns the remaining time to live of a key in seconds. | |
| Example: | `TTL mykey` | |
21. TYPE |
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| Usage: | `TYPE key` | |
| Description: | Returns the data type of the value stored at the key. | |
| Example: | `TYPE mykey` | |
Conclusion
This Redis cheatsheet provides a quick reference to some of the most commonly used commands for database management. By mastering these commands, you can effectively manipulate your data and optimize performance in your Redis instance.
Whether you are managing simple key-value pairs or more complex data structures, these commands will empower you to get the most out of Redis.
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