caching – Page 8 – Türker Yıldırım

wp_cache_add_global_groups, or multisite prefixes it

NoteMarch 10, 20202 min read

On a multisite network the object cache prefixes keys with the blog id unless the group is declared global, so data cached on one site is invisible to…

A drop-in is not a plugin, and object-cache.php is one

NoteFebruary 7, 20201 min read

A drop-in is a file with a fixed name in wp-content that WordPress loads if it exists, and it cannot be activated, deactivated or updated by anything. object-cache.php…

Laravel 5.8 moved cache TTLs to seconds

NoteNovember 5, 20191 min read

The TTL argument was minutes for years and became seconds in 5.8, which means every existing call now expires sixty times sooner and nothing warns about it. This…

The N+1 in the ORM you cannot see from the template

Deep diveOctober 17, 201910 min read

Subquery selects in 6.0, and the aggregate that used to be a loop. Eager loading is all-or-nothing per relation, which is the problem.

proxy_cache with a stale-while-revalidate directive

NoteOctober 3, 20192 min read

A cache that expires and then blocks every waiting request on one slow origin fetch is a cache that makes the worst moment worse. proxy_cache_lock means one request…

wp_cache_add_global_groups, or multisite prefixes it silently

NoteAugust 8, 20192 min read

On a multisite network the object cache prefixes keys with the blog id unless the group is declared global, so data cached on one site is invisible to…

Lazy collections and the report that would not fit in memory

Deep diveJune 24, 201910 min read

A memory limit hit on the fourth of the month, every month. A collection is an array, and an array is all of it at once — until…

The decorator that adds caching without touching the class

NoteMay 23, 20192 min read

Putting a cache inside a repository mixes two concerns and makes the uncached version untestable, and the alternative is a second implementation of the same interface. The decorated…

The object cache is per-request unless a drop-in says otherwise

NoteMay 22, 20192 min read

wp_cache_get works on every WordPress site and on most of them it is an array that is discarded at the end of the request — which is still…

A cache that survives the thing it is caching

Deep diveMay 8, 201914 min read

The cache expired at noon and the database fell over at 12:00:01. A lock, a two-tier expiry, jittered TTLs, and versioned keys — in that order of importance.