On Mon, May 17, 2021 at 12:18 AM Loles <lolesft@gmail.com> wrote: > > Hi! > > Let's see if someone can answer my question. > > In a default PostgreSQL 13 installation, starting the server starts a process called "logical replication launcher". > > I know what logical replication is but I don't know what this process does on the server. > > Even if you change the default setting of wal_level to minimal, the process continues to start after the server is restarted so that it takes the change in the wal_level parameter.
This process launches the worker process for each subscription for applying the logical replication changes. It does not matter what is the wal level, because wal level should be logical to create a publisher but this is used for launching the worker for the subscriber. So in short this process will scan the subscriber and launches the apply worker if there is no worker corresponding to some subscription.
