Learning term
pg_dump — PostgreSQL
pg_dump exports logical PostgreSQL structures and data into a backup format. This card shows its role in “PostgreSQL” and a safe diagnostic path.
Orientation
pg_dump exports logical PostgreSQL structures and data into a backup format. At this level, separate purpose, input, and visible result. Place pg_dump within PostgreSQL before changing settings or files.
Practical use
Check exit code and file size before treating a dump as a successful backup. Start in a sandbox with neutral examples. Record the expected state, make one controlled change, and compare status output, application behavior, and logs.
Technical understanding
pg_dump exports logical PostgreSQL structures and data into a backup format. Technically, pg_dump connects through interfaces, configuration, state, or dependencies. Trace data from input to output and check versions, permissions, networking, storage, and resources separately.
Operations and debugging
Check exit code and file size before treating a dump as a successful backup. In production-like operations, use measurable signals, least privilege, reproducible configuration, and a documented rollback. Preserve evidence, isolate the cause, and verify the correction with the same test.
Exercise
Try it safely
Check exit code and file size before treating a dump as a successful backup. Open an isolated test environment and run “psql --version && printf "%s\n" "SELECT 1;"”. Write down the expected output first, do not alter production data, and record one safe next diagnostic step.
psql --version && printf "%s\n" "SELECT 1;"Quick check
Can you explain the purpose, observable state, and most common failure source of pg_dump — PostgreSQL in one sentence each? Which evidence would you preserve before changing anything, and which repeated test would prove that the correction actually worked?