This article discusses several changes we have made to the EXPIRE command and how it works. This article shows that these somewhat controversial features are feasible. We have added the ability to expire individual members of a set with the EXPIREMEMBER command and have also enabled active deletion to operate in near real-time, which has big advantages for those who rely heavily on using expires in production. Throughout the work with the EXPIRE command, we have actually achieved 5-10% memory savings.
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This work has been done in KeyDB (by EQ Alpha Technology), which is an open source, high-performance fork of Redis, where we are able to implement features that may never become a part of Redis. We hope the two projects can continue to grow and learn from each other.