Обсуждение: Confusing long option in pg_receivexlog/basebackup/dumpall

On 02.05.2013 08:43, Pavan Deolasee wrote:
> Hi All,
>
> While looking at the help message of pg_basebackup, I got a bit confused by
> it. It looks something like this:
>
> Connection options:
>    -d, --dbname=CONNSTR   connection string
>
> So the long option says "--dbname" which is not really what its expecting.
> The same issue also applies to pg_receivexlog and pg_dumpall. I wonder if
> this is a well thought out user API or just an oversight when we chose to
> use "-d" to pass connection string to the command, In fact, I would have
> avoided using either -d or --dbname because they are used very frequently
> in other commands to mean something else.

It's deliberate, although I admit it's confusing. The manual explains it:

> -d connstr
> --dbname=connstr
>
>     Specifies parameters used to connect to the server, as a connection string. See Section 31.1.1 for more
information.
>
>     The option is called --dbname for consistency with other client applications, but because pg_basebackup doesn't
connectto any particular database in the cluster, database name in the connection string will be ignored.
 

In other tools too, like psql, you can pass a connection string with 
-d/--dbname, which is why I thought it would be best to use the same 
option for passing a connection string to pg_basebackup/pg_dumpall too.

See discussion at 
http://www.postgresql.org/message-id/512520FE.6050701@vmware.com. If you 
have any better ideas, I'm all ears...

- Heikki