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Databases
Introduction: Recently I was having a conversation with a DB Enthusiast, and he mentioned that when he was a fresher, he tuned an ETL/reporting query that was running for 8-10 hours via a nightly job by 1/3rd. He went to his manager,…
On 6th of April 2026, Álvaro Herrera committed patch: Add CONCURRENTLY option to REPACK When this flag is specified, REPACK no longer acquires access-exclusive lock while the new copy of the table is being created; instead, it creates the…
Every 1 KB insert in Postgres becomes ~2.5 KB of committed I/O before it's done. Here's where the multiplier comes from, and where the tuning knobs run out.
On a PostgreSQL build with assertions enabled, run the standard make check-world suite with a small debugging extension called pg_pathcheck loaded. It will report on pointers to freed memory in the planner's path lists. Such dangling…