Re: PG 10 streaming replication pg_wal question

ghiureai wrote:
> I am testing PG10 streaming replication , with archiving off, I have
> pg_wal on separate directory to monitor the growth , I had the slave
> offline yesterday for more than 20h while I was restoring one of db
> (60GB) with pg_restore from a backup taken with pg_dump, today I brought
> the slave PG host online and replication catch up nicely , master and
> slave are in sync now, but on master host the pg_wal is still same
> large size ( as yesterday) even after all the wal files had been
> applied to salve, would replication process not suppose to removed the
> wal files on master after being applied to salve ?
> ( do I need to manually implement a cleanup job of this wal files, as
> mentioned archiving is off on both servers)

Never remove WAL files yourself.

pg_wal will shrink eventually.
At the next checkpoint, PostgreSQL will remove all WAL files
that were completed and archived successfully since the
previous checkpoint, thus reducing WAL size a little.

If there is activity on the databases, pg_wal will eventually
shrink back to max_wal_size.

Yours,
Laurenz Albe