On 23rd of February, Heikki Linnakangas committed patch: Replace checkpoint_segments with min_wal_size and max_wal_size. Instead of having a single knob (checkpoint_segments) that both triggers checkpoints, and determines how many checkpoints to recycle, they are now separate concerns. There is still an internal variable called CheckpointSegments, ...

While there are some docs on it, I decided to write about it, in perhaps more accessible language - not as a developer, but as PostgreSQL user. Some parts (quite large parts) were described in one of my earlier posts, but ...