25 Redis Command Keywords You Need to Know for Improved Data Management（redis指令）

Redis is an in-memory data structure store. It is mainly used for caching, message queues, synchronization, leader election, distributed computing, and high-performance databases. As such, it is a very powerful tool for managing key/value data.

One of the most powerful features of Redis is its command set. It includes 25 keywords that can be used to manipulate data. Each keyword has a specific meaning and purpose, and it is important to understand them in order to effectively use Redis.

The following is a list of 25 Redis command keywords and their purposes:

1. SET: Sets the value of a key.

2. GET: Retrieves the value of a key.

3. DEL: Deletes a specified key and the associated value.

4. EXPIRE: Sets an expiration time for a key.

5. TTL: Shows the amount of time left before a key’s expiration.

6. EXISTS: Checks whether a key exists or not.

7. RENAME: Renames a key.

8. TYPE: Returns the type of value associated with a key.

9. KEYS: Returns all keys matching a certain pattern.

10. RANDOMKEY: Returns a random key from the store.

11. SORT: Sorts all keys in the store.

12. FLUSHDB: Deletes all keys in the current database.

13. SELECT: Allows you to switch to a different database.

14. MOVE: Moves a key from one database to another.

15. EXPIREAT: Sets an expiration time for a key, expressed in Unix time.

16. PERSIST: Removes the expiration time from a key.

17. PEXPIRE: Sets an expiration time for a key, expressed in milliseconds.

18. PTTL: Shows the amount of time left before a key’s expiration, expressed in milliseconds.

19. RPUSH: Appends one or more elements to a list.

20. LPOP: Removes and returns the first element in a list.

21. SADD: Adds one or more elements to a set.

22. SMEMBERS: Shows all members of a set.

23. ZADD: Adds one or more elements to a sorted set.

24. ZRANGE: Returns a specified range of elements in a sorted set, by indices.

25. ZCARD: Returns the number of elements in a sorted set.

Using these 25 Redis command keywords, developers can leverage Redis for a variety of use cases, such as caching, authentication, and message queues. By familiarizing yourself with these useful commands, you will be able to take full advantage of Redis’s capabilities.

For example, the following code snippet shows how to use the SET keyword to store key/value data in Redis:

redis.set("key1", "value1");

In conclusion, once you have familiarized yourself with the 25 Redis command keywords, you will have a good understanding of how to leverage the power of Redis to store, manipulate and manage your data. Redis is an invaluable tool, and by learning and utilizing these command keywords, you can reap the most benefits with minimal effort.