<b>This week in caching: Redis object cache, the parts that bite</b>

<b>This week in caching: Redis object cache, the parts that bite</b>
For WP and app devs who added Redis and assumed it just works.
— <b>alloptions is your silent memory hog</b> — Till Krüss's notes on how a bloated <code>wp_options</code> autoload row gets cached as one giant key, evicted constantly, thrashing your hit rate.
— <b>maxmemory-policy matters more than maxmemory</b> — <code>allkeys-lru</code> vs <code>noeviction</code> is the difference between graceful degradation and write errors at capacity.
— <b>persistent connections or you pay TCP every request</b> — PhpRedis vs Predis: the C extension wins on high-traffic sites, measurably.
<b>Bookmark:</b> Till Krüss's Object Cache Pro docs — even the free reading explains group-flushing better than anywhere else.