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>
The above is the detailed content of Clear redis cache data. For more information, please follow other related articles on the PHP Chinese website!

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