Redis setting TTL on hSet Keys

Question

I am on an dead end with redis cache. I want to set an TTL on the initiation of a key. The key will be set by hSet($hash, $key, $data)

expire($key, '3600')

does not seem to work. Is there an hExpire() method?

Solution

Explanation:

Redis supports expiration only on KEY level. It does not support expiration on inner element(s) of any data structure, let alone hash.

Answer:

1. No. There is no hExpire method/command in Redis.
2. You're trying expire an inner element in a hash. This is not possible in Redis.

Update:

You can expire a whole data structure (a.k.a. a key).

One of the command to expire key is EXPIRE key seconds.

Assuming you are using phpredis, your method call can be setTimeout($hash, 3600).

Comments

[thepirat000]

short answer: no. long answer: no, you can't.

[Isengo]

Can I expire or set a TTL for the hash? Tomasz says I can put a TTL on the hash itself

[Isengo]

Which method is that? How can I do so?

[Bhoomtawath Plinsut]

@Isengo He meant TTL on the key itself using redis.io/commands/expire. You can't expire a hash, but you can expire each key.