redis cache cleaning command

Redis provides a variety of cache cleaning commands: 1. DEL deletes the specified key; 2. FLUSHDB clears the current database key; 3. FLUSHALL clears all database keys (irreversible, use with caution); 4. EXPIRE sets survival for the key time, it will be automatically deleted when it expires; 5. UNLINK asynchronous deletion key, the actual deletion will be performed the next time SAVE/BGSAVE is run.

Redis Cache Cleaning Command

Question: How to clean the Redis cache?

Answer:

Redis provides a variety of commands to clear the cache:

1. DEL command

• Delete one or more specified keys.
• Syntax: DEL key1 key2...
• For example: DEL mykey key2

2. FLUSHDB command

• Clear all keys in the current database.
• Syntax: FLUSHDB

3. FLUSHALL command

• Clear all keys in all databases.
• Note: This command is irreversible, please use it with caution.
• Syntax: FLUSHALL

4. EXPIRE command

• Set the survival time for the specified key. When the time-to-live expires, the key is automatically removed from the cache.
• Syntax: EXPIRE key seconds
• For example: EXPIRE mykey 3600

5. UNLINK command

• Asynchronously deletes one or more specified keys. The key is not actually removed from the cache until the next SAVE or BGSAVE command is run.
• Syntax: UNLINK key1 key2...
• For example: UNLINK mykey key2

Notes:

• Cleaning the cache may cause performance degradation because refilling the cache takes time.
• Choose the appropriate command based on your specific needs.
• Be careful when using the FLUSHALL command as it is irreversible.
• Cleaning the cache regularly helps maintain cache efficiency and performance.

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