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?
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3 Answers
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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:
- No. There is no
hExpiremethod/command in Redis. - 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).
sazzad
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Can I expire or set a TTL for the hash? Tomasz says I can put a TTL on the hash itself – Isengo Apr 27 '18 at 19:46
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You need to put the TTL on the $hash itself as you can't expire individual keys of a hash.
Tomasz Poradowski
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@Isengo He meant TTL on the key itself using https://redis.io/commands/expire. You can't expire a hash, but you can expire each key. – Bhoomtawath Plinsut Mar 25 '21 at 08:02
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@sazzad Why does Redis not support the EX parameter for HSET like it does for SET ? It is constraining to have to make a second EXPIRE command – bdeweer Jul 27 '23 at 22:15
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You can try TairHash, which is a redis module, similar to redis hash, but you can set expire and version for the field: https://github.com/alibaba/TairHash
user443895
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