Re: "truncate all"?

On Mon, 2003-08-04 at 05:40, Shridhar Daithankar wrote:
> On 4 Aug 2003 at 11:25, Andreas wrote:
> > Would it be possible to implement a "truncate all" that purges all tuples
> > from *all* tables, without taking account any rules or triggers, but
> > leaving all table structures and rules, triggers, functions, etc intact
> > (sequences do not need to reinitialized)?
> >
> > As far as I understand, the "no truncate if table is referenced" change was
> > introduced to ensure database integrity. However, if the referencing table
> > is truncated, too, there should be no problem as far as foreign keys are
> > concerned, correct?
> >
> > The rationale behind this suggestion is that in our project we need a
> > *quick* way to get rid of all the tuples in all tables in order to
> > accelerate the reinitialization of the database for our unit tests. This
> > needs to be done fairly often, and so the quicker the unit tests run, the
> > easier it will be to include many unit tests in our project, thus ensuring
> > that we can develop efficiently and safely in postgresql.
> >
> > If you know of some other *quick* way to truncate all tables, please let us
> > know. BTW: Starting and later rolling back a transaction will not work, as
>
> As a workaround, I would dump the schema to a file using pg_dump, drop the
> database and recreate it from schema.
>
> Will that do for you? Unfortunately that is not transaction safe and any
> clients connected at that time needs to disconnect first. Hopefully you can do
> that in the test environment.
>

Truncate isn't transaction safe either, so that shouldn't be a problem.

Proper syntax for his feature would seem like:
truncate table [cascade|restrict] ?

Robert Treat
--
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