Redis/Jedis - Delete by pattern?

Question

Normally, I get the key set then use a look to delete each key/value pair.

Is it possible to just delete all keys via pattern?

ie:

Del sample_pat         


        

Answer 1

KEYS is not recommended to use due to its inefficiencies when used in production. Please see https://redis.io/commands/keys. Instead, it is better to use SCAN. Additionally, a more efficient call than repeated calls to jedis.del() is to make one single call to jedis to remove the matching keys, passing in an array of keys to delete. A more efficient solution is presented below:

Set matchingKeys = new HashSet<>();
ScanParams params = new ScanParams();
params.match("sample_pattern:*");

try(Jedis jedis = jedisPoolFactory.getPool().getResource()) {
    String nextCursor = "0";

    do {
        ScanResult scanResult = jedis.scan(nextCursor, params);
        List keys = scanResult.getResult();
        nextCursor = scanResult.getStringCursor();

        matchingKeys.addAll(keys);

    } while(!nextCursor.equals("0"));

    if (matchingKeys.size() == 0) {
      return;
    }

    jedis.del(matchingKeys.toArray(new String[matchingKeys.size()]));
}