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How to delete cache in redis

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There are four methods to delete cache in Redis: direct deletion (DEL command), batch deletion (KEYS UNLINK command), fuzzy deletion (SCAN UNLINK command) and time-based expiration (TTL).

How to delete cache in redis

How to delete the cache in Redis

Delete directly

Use the DEL command to directly delete the cache of the specified key.

<code>DEL key_name</code>

Batch deletion

Use the KEYS command to get the keys matching a specific pattern, and then use the UNLINK command to delete these in batches key.

For example: Delete all keys starting with product_*:

<code>KEYS product_*
UNLINK $(keyspace_keys ...)</code>

Fuzzy delete

Use the SCAN command to iterate over all keys and use the fnmatch module in a scripting language such as Python to match keys. Matching keys can be deleted using the UNLINK command.

Example: Delete all keys containing the string user_ID:

<code class="python">import redis
import fnmatch

r = redis.Redis()
for key in r.scan_iter():
    if fnmatch.fnmatch(key, "*user_ID*"):
        r.unlink(key)</code>

Time-based expiration (TTL)

If a TTL is set for a key, the key will be automatically deleted upon expiration.

For example: Set the TTL of key user_info to 10 minutes:

<code>EXPIRE user_info 600</code>

Notes

  • Be careful with security when deleting cache as this may result in data loss.
  • Use fuzzy delete with caution as it may accidentally delete other keys.
  • Regularly clear caches that are no longer needed to optimize Redis performance.

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