Time of creation of key in redis

Question

Suppose I do this in redis at 13:30 20 Feb 2020,

> set foo "bar spam" OK 

I want to get time of creation of foo. Is there something like

> gettime foo 13:30 20 Feb 2020 

?

Answer 1

Redis doesn't store this information.

You could use a separate key:

MULTI SET foo "bar spam" SET foo:time "13:30 20 Feb 2020" EXEC  GET foo:time 

Answer 2

There is another, similar option to solve this, for the use case when you need timer to detect expired value without deleting the value itself:

MULTI SET foo "bar" SET foo:alive 1 EX 30 EXEC 

Here 30 - is a desired timeout. You can then determine whether value is still "alive" with:

EXISTS foo:alive