How to find keys with redis

There are several ways to find keys in Redis: use the SCAN command to iterate over all keys by pattern or condition. Use GUI tools such as Redis Explorer to visualize the database and filter keys by name or schema. Write external scripts to query keys using the Redis client library. Subscribe to keyspace notifications to receive alerts when key changes.

How to find keys in Redis

There are a variety of ways to find keys in Redis, depending on your specific needs and the tools available.

1. Manual command: SCAN

The SCAN command allows you to iterate over all keys in the Redis database by schema or specific conditions. The syntax is as follows:

 <code>SCAN cursor [PATTERN] [COUNT] [TYPE]</code>

• cursor : A marker indicating where to start scanning.
• PATTERN (optional): The key pattern to match.
• COUNT (optional): The number of keys returned per iteration.
• TYPE (optional): The type of key to return (for example, string, list).

2. Using the Redis Explorer GUI

If you use GUI tools such as Redis Explorer, you can easily visualize your database and find specific keys. These tools usually provide search functionality that allows you to filter keys by name or pattern.

3. External scripts

You can use external scripts (such as Python or Ruby) to write code to connect to Redis and query the key. This requires the use of Redis client libraries such as redis-py or hiredis.

4. Use keyspace notifications

Redis provides keyspace notifications that allow you to subscribe to notifications about key changes in the database. You can use this feature to receive alerts when the key is updated, deleted, or created.

Example: Use the SCAN command to find keys

 <code>redis> SCAN 0 MATCH mykey* 1) (integer) 0 2) 1) "mykey1" 2) "mykey2" 3) "mykey3"</code>

This command returns all keys that match the pattern "mykey*" and resets the cursor to 0.

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