Redis Expire Key: How TTL behaves?

  • An operation that modifies a key’s value resets the TTL.
  • An operation that alters the key’s value leaves TTL untouched.

Create a list with TTL = 120

redis> rpush "mylist" "first"  
(integer) 1  
  
redis> rpush "mylist" "second"  
(integer) 2  
  
redis> expire "mylist" 120  
(integer) 1  

Add new elements to the list and verify TTL

redis> TTL mylist  
(integer) 99  

redis> rpush "mylist" "second"  
(integer) 3  
  
redis> TTL mylist  
(integer) 79  

However, a call to EXPIRE will refresh the TTL.

References

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