PG_CONTROLDATA(1)

📦 version 15.19, in opensuse-leap 16.0

💖 PG_CONTROLDATA(1) — the pg_controldata manual, bestie 💖

okay so this is the PG_CONTROLDATA(1) page from the PostgreSQL 15.19 Documentation, and it's literally your guide to peeking at a PostgreSQL database cluster's control info. no cap, it's giving very niche but very iconic. 🎀

🦋 NAME 🦋

pg_controldata — display control information of a PostgreSQL database cluster. periodt. 💅

🌸 SYNOPSIS 🌸

okay so the shape is exactly this, bestie:

pg_controldata [option] [[-D | --pgdata]datadir]

✨ DESCRIPTION ✨

okay so pg_controldata prints the info that got initialized during initdb, such as the catalog version — yes, that catalog version. it also shows information about write-ahead logging and checkpoint processing. this information is cluster-wide, and not specific to any one database, so it's whole-cluster tea, not single-database tea. 🫖

ngl, there's a permissions moment: this utility can only be run by the user who initialized the cluster, because it requires read access to the data directory. you can specify the data directory on the command line, or use the environment variable PGDATA. no cap, that's the vibe check. 🔥

the command-line options are giving very specific main character energy:

  • -D, --pgdata — lets you specify the data directory on the command line, with datadir as the data directory in the synopsis.
  • -V, --version — prints the pg_controldata version and exits. slay, short and sweet. ✨
  • -?, --help — outputs the supported arguments. literally the "help me help you" option. 🫶
it's cluster-wide, not per-database, so don't go looking for one specific database's lore here. it's the whole cluster's business. 💀

🌈 ENVIRONMENT 🌈

  • PGDATA — default data directory location. the classic "where's my data at" default. 🎀
  • PG_COLOR — specifies whether to use color in diagnostic messages. possible values are always, auto and never. yes, you can have cute colored diagnostics, iykyk. 💜

stay slay, bestie 💅 — this page is from PostgreSQL 15.19, dated 2026, and it's the PG_CONTROLDATA(1) manual. mwah 🫶

📦 where this page comes from