Re: "truncate all"? - Mailing list pgsql-hackers

From Robert Treat
Subject Re: "truncate all"?
Date
Msg-id 1060004485.22273.1729.camel@camel
Whole thread Raw
In response to Re: "truncate all"?  ("Shridhar Daithankar" <shridhar_daithankar@persistent.co.in>)
Responses Re: "truncate all"?
Re: "truncate all"?
List pgsql-hackers
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
-- 
Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL



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