Count keys of hashset

[manu.t...@gmail.com]

Hello,

I want to make a count on hashset to determine the number of keys. 

I use a lua script for the count like db.eval("return #redis.call('keys', '"+collection_name+":*')",0) but performances decrease dramatically when I run my script.

Is there a way to make a hashset count and avoid to lost performance on redis ? 

Regards,

Emmanuel

[Itamar Haber]

Firstly, don't use KEYS, SCAN if you must.

Secondly, both the-command-that-should-not-be-used and SCAN iterate through your server's entire keyspace. This will always result degraded performance as the number of total keys grows.

The way you'd usually keep track of key names in Redis (to quickly retiring these names) is by managing a set who's members are the relevant key names. This requires you to SADD/SREM accordingly in your code whenever you create/delete a key that belongs to that "index" set.

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[Itamar Haber]

^retiring^retrieving