Clear redis cache data

Commonly used Redis cache cleaning methods include: FLUSHALL: clear all key-value pairs. DEL: Delete the specified key. UNLINK: Asynchronously delete the specified key. EXPIRE: Set the expiration time of the key, which will be automatically deleted after expiration.

Clear Redis cache data

Common methods to clear Redis cache data:

• FLUSHALL: Clear all key-value pairs in Redis.
• DEL key1 key2 ...: Delete multiple specified keys.
• UNLINK key1 key2 ...: Asynchronously delete multiple specified keys.
• EXPIRE key seconds: Set the expiration time for the specified key so that it will be automatically deleted after the specified time.

Basis for choosing the cleanup method:

• Full clear: Use the FLUSHALL command to quickly and completely delete all cached data.
• Delete specific keys: Use the DEL or UNLINK command to delete specific keys that are not needed.
• Set the expiration time: Use the EXPIRE command to set the expiration time for the key, and it will be automatically deleted after expiration.

The difference between UNLINK and DEL:

• Atomicity: UNLINK is atomic, that is, all specified keys or all Delete or delete nothing. DEL is non-atomic and may cause partial bond deletion to fail due to network issues or other reasons.
• Asynchronicity: UNLINK is executed asynchronously and will not block the Redis server. DEL, on the other hand, is executed synchronously and may block the server during key deletion.

Usage example:

• Clear all key-value pairs:

  <code>redis> FLUSHALL</code>

• Delete a specific key:

  <code>redis> DEL name age</code>

• Delete a specific key asynchronously:

  <code>redis> UNLINK name age</code>

• Set the expiration time for the key:

  <code>redis> EXPIRE name 600</code>

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