zlacker

hmmm, I disagree that it's not better. Select operation implies index scan most likely with O(log n), while GET operation is essentially O(2-3). And you also have to run DELETE on sql to remove the expired keys.

Oh, and i'm not entirely sure about the part about redis active expiry (disabled by default, default is remove expired on lookup - lazy); you're talking about key eviction which applies to all deleted keys and AFAIR happens only when certain watermarks are hit. Since it happens in ram, it's also faaaast, unlike SQL DELETE, which will definitely involve disk...