Peter,

> This is normal. Postgres is said to have a multi-process architecture
> (which is often contrasted with a multi threaded architecture). The
> number of processes isn't very predictable.
>
> you are right, it is normal.

But the number of processes is quite predictable:

on default PostgreSQL starts up with 5 processes:

one background-writer
one postmaster who masters the startup of additional progresses
one autovacuum-daemon
two processes which I have not leveled up enough to know what they are doing

And then there is one additional process for every client connection.

Harald

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