Heikki Linnakangas <hlinn...@iki.fi> writes:
> On 13/05/2024 16:01, Juan Hernández wrote:
>> Do you consider useful to add a parameter (for example,
>> --separatetables) so when used the exporting file process can create a
>> different tablename.sql file for each table in database automatically?
> It'd be tricky to restore from, as you need to restore the tables in the
> right order. I think you'd still need a "main" sql file that includes
> all the other files in the right order. And using the table names as
> filenames gets tricky if the table names contain any funny characters.
It's a lot worse than that, as it's entirely possible to have circular
FK dependencies, meaning there is no "right order" if you think of
each table file as self-contained DDL plus data. Other sorts of
circularities are possible too.
pg_dump deals with that hazard by splitting things up: first create
all the tables, then load all the data, then create all the indexes
and foreign keys. You can tell it to just emit the parts relevant to
a particular table, but it's on your head whether that's actually
going to be useful in your context. I doubt that it's widely enough
useful to justify creating a special mode beyond what we already
have.
regards, tom lane
