Showing Post From Databases
Redis, Valkey, and Dragonfly memory and upgrades: revisit before the next spike
A payments team runs its session cache with maxmemory 12gb on a 16 GB node and feels safe. On a festival sale evening a replica reconnects, a reporting job pulls a few huge hashes, and the kernel kills the process while used_memory still shows less than 12 GB.
Read morePostgreSQL asynchronous I/O: revisit your settings before you upgrade
A team upgrades its reporting database from PostgreSQL 16 to 18 over a weekend. On Monday the nightly scans finish a little faster, and nobody knows why, because nobody changed a setting.
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