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count(*) per tenant in PostgreSQL 17, measured: why it got 5× slower for the largest tenant, when estimates are wrong, and what a counter row costs under load.
PostgreSQL 18's new `num_os_semaphores` preset reports how many OS semaphores the server needs—a formula that drifted wrong for twelve years until the… (I consult on PostgreSQL through PGX Inc..)
MySQL is very good at serving application workloads, but things get more complicated when somebody decides to run a large report on the same server. A scan can push hot pages out of the buffer pool. A long-running read can hold back purge.…
Dive deeper into connection pooling with five more PostgreSQL poolers: Odyssey, pgagroal, Supavisor, PgDoorman, and ProxySQL, plus where your cloud already… (I consult on PostgreSQL through PGX Inc..)