Adrian. Based on your earlier remarks and further investigation I find that the restoration of a schema ( -n ) goes smoothly if there are no foreign key References to the tables being restored from a schema that is not part of the restoration. I had a couple of those that I had not initially appreciated and was able to redesign to accommodate that.
Similarly if using the -t table restoration option of tables within a schema, one has to include all tables that have a foreign key reference to the table(s) being restored. I have to rethink some layout based on this but at least I understand this all now. I still think a drop cascade or defer constraints options might be useful. I can probably pipe the pg_restore output to a perl script that could "tweak" the pg_restore output and in turn pipe that to psql if I really need this capability. Thanks again for your assistance. Dave -----Original Message----- From: Adrian Klaver [mailto:adrian.kla...@gmail.com] Sent: Thursday, January 09, 2014 6:09 PM To: Day, David; pgsql-general@postgresql.org Subject: Re: [GENERAL] pg_restore - selective restore use cases. HINT use DROP CASCADE On 01/09/2014 01:51 PM, Day, David wrote: > Adrian, > > Thank you for your response. > > I would note that the original dump archive created by pg_dump > included all schemas and that I only intend to restore a schema from it that > is self contained, or a group of related tables from it. I just tried that here and succeeded. I did a pg_dump and then restored only the public schema which in this database is self contained. I did get the HINT because I used the -c switch and it tried to drop the public schema and there where existing objects dependent on it. The restore threw the HINT and a subsequent ERROR over trying to CREATE SCHEMA public where it already existed, but it completed the restore. > > I acknowledge the dangers inherent in selective restoration, it just > seems that a couple of additional options ( disable constraints, drop > cascade ) to pg_restore would improve this utility to users who have > put some thought into laying out the database design and failure cases from > which they would like to recover. > > To have a pg_restore selective restoration options, (-n, -t ), and > have it fail simply because there are foreign keys amongst the tables > within that schema seems like to much protection or protection that I would > at least like to have option to over-ride. We will probably need to see more detail on why that failed in your case because I did not see that in mine. Another way to influence the outcome is to use the -l and -L options to pg_restore. -l returns the -Fc dump file table of contents(TOC) as a list. You can redirect that to a file and in that file comment out(using ;) items and rearrange the order of the TOC to suit your needs. Then you use pg_restore with the -L option to feed it the edited TOC. http://www.postgresql.org/docs/9.3/interactive/app-pgrestore.html > > It may well be that I could shoot myself in the foot, but I'd still > like to own the firearm :+) > > > Regards > > > Dave Day > > -- Adrian Klaver adrian.kla...@gmail.com -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
