2016-12-21 20:29 GMT+01:00 Daniel Westermann < daniel.westerm...@dbi-services.com>:
> >> postgres@pgbox:/home/postgres/ [PG961] pg_restore -h localhost -p 5439 > -F d -C -j 2 /var/tmp/exp/ > >> > >> This runs fine but where does it connect to? Nothing is listening on > port 5439. > > >Given the lack of a -d switch, I'd expect it not to try to connect > >anywhere, just emit the restore script on stdout. At least, that's > >what happens for me. It's weird that you don't see any printout. > > >(To be clear: it's -d that triggers a connection attempt in pg_restore. > >Without that, -h and -p are just noise.) > > Ok, that makes sense. I got the output on screen, as mentioned. > > What I would have expected is at least a hint or warning that host and > port are ignored if you do not specify the "-d" switch. Giving port and > host clearly indicates that I want to connect to what I provided, doesn't > it? psql uses the os username as default database, pg_restore doesn't? > > postgres@pgbox:/home/postgres/ [PG961] unset PGDATABASE > postgres@pgbox:/home/postgres/ [] psql > psql (9.6.1) > Type "help" for help. > > (postgres@[local]:5439) [postgres] > > > Providing "-d" gives a meaningful message at least: > > postgres@pgbox:/home/postgres/ [PG961] pg_restore -h localhost -p ===6666 > -d postgres -F d -C /var/tmp/exp/ > pg_restore: [archiver (db)] connection to database "postgres" failed: > invalid port number: "===6666" > > Maybe it is only me, but this is not consistent behavior, is it? > > It isn't consistent but it's by purpose. And there's a really good reason for that behaviour. There's no issue with psql connecting to a default database because psql doesn't do anything by itself. pg_restore will do something to the database it connects to. It might drop some objects, create some, add data. I want to be sure it's restored in the right database. I don't want it to second-guess what I want to do. Otherwise, I'll have a really hard time fixing everything it did. So -d is required by pg_restore to connect to some database, whereas there's no big deal with psql connecting to a default database. -- Guillaume. http://blog.guillaume.lelarge.info http://www.dalibo.com
