How to quickly delete keys with redis

Redis provides a variety of ways to quickly delete keys: use the DEL command to delete a single key. Use the UNLINK command to delete multiple keys. Use the KEYS command and the EVAL command to delete the Key according to the pattern. Use Lua scripts to improve the performance of deleting large numbers of keys. Use Redis Streams to delete data based on time.

How to quickly delete Keys in Redis

Redis provides a variety of ways to quickly delete keys, depending on the structure and application scenarios of the data.

Use the DEL command

This is the easiest way to delete a single key:

 <code>DEL key1 key2 ...</code>

Use the UNLINK command

The UNLINK command can delete multiple keys without blocking other operations:

 <code>UNLINK key1 key2 ...</code>

Use the KEYS command and the EVAL command

For scenarios where multiple keys need to be deleted according to the pattern, you can combine the KEYS and EVAL commands:

 <code>KEYS pattern | EVAL 'local keys = redis.call("keys", ARGV[1]); for i, key in ipairs(keys) do redis.call("DEL", key) end' 0 pattern</code>

Using Lua Scripts

Lua scripts can provide higher performance, especially when you need to delete a large number of keys:

 <code class="lua">local keys = redis.call('keys', pattern) for i, key in ipairs(keys) do redis.call('del', key) end</code>

Using Redis Streams

Redis Streams provides XTRIM and XREADGROUP options for scenarios where data needs to be deleted based on time. This allows for deletion of expired or outdated messages without blocking other operations.

When to use which method?

• DEL command: The fastest choice when deleting a single key.
• UNLINK command: When multiple keys are deleted and no immediate return result is required.
• KEYS and EVAL commands: When deleting a large number of keys according to the pattern.
• Lua script: Higher performance, suitable for deleting large numbers of keys.
• Redis Streams: When deleting data according to time.

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