Open two psql sessions. Session A: BEGIN; DELETE FROM users; -- deletes all 1 million rows --...
Open two psql sessions.
Session A:
BEGIN;
DELETE FROM users; -- deletes all 1 million rows
-- don't commit yet
What happens to old row versions after nobody needs them? They become dead tuples, and over time they bloat your tables. Go…
Introduction PostgreSQL uses MVCC (Multi-Version Concurrency Control) for concurrency...
Most backend engineers implement multi-tenant quota checks using a standard "read-then-write"...
MVCC, WAL, vacuum, and replication slots under sustained delete load - and how to delete...
When we write: SELECT * FROM users WHERE id = 100; Enter fullscreen mode Exit...
As developers, we interact with databases every single day. We write a line of code like UPDATE users...
