Q: How do I clear key timeout in Redis?

To manually clear a key’s timeout, use the persist command: The persist command will return (integer) 1 if it completed successfully, indicating that the key will no longer expire. This guide details a number of commands used to manipulate and check key persistence in Redis.

Question 1

How do Redis keys expire?

Accepted Answer

Redis keys are expired in two ways: a passive way, and an active way. A key is passively expired simply when some client tries to access it, and the key is found to be timed out. Of course this is not enough as there are expired keys that will never be accessed again.

Question 2

Why does Redis add a second layer of active expiration?

Accepted Answer

But the problem is that if a key is never touched, it just takes up memory for no reason. So Redis adds a second layer of random active expiration. It just reads random keys all the time, and when an expired key is touched it is deleted based on the lazy mechanism.

Question 3

How do I get a list of all keys in Redis?

Accepted Answer

First, we use redis-cli --scan --pattern <pattern> to get a list of keys, one key per line. We then run an awk script for each key. This awk script is a little complex, so we will break it down

Question 4

How do I clear key timeout in Redis?

Accepted Answer

To manually clear a key&rsquo;s timeout, use the persist command: The persist command will return (integer) 1 if it completed successfully, indicating that the key will no longer expire. This guide details a number of commands used to manipulate and check key persistence in Redis.

Is it a good practice to set expire for all keys in redis

Tags:

performance

redis

storage

ttl

NameNotFoundException

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