pg_dump cosmetic problem while dumping/restoring rules - Mailing list pgsql-hackers

From Gražvydas Valeika
Subject pg_dump cosmetic problem while dumping/restoring rules
Date
Msg-id CAO6eJZrsxPNsD=LZPrLJ4kUx-4yB2TtpbiU-2bMH8L1gqdHF9Q@mail.gmail.com
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Responses Re: pg_dump cosmetic problem while dumping/restoring rules  (Andres Freund <andres@2ndquadrant.com>)
Re: pg_dump cosmetic problem while dumping/restoring rules  (Dimitri Fontaine <dimitri@2ndQuadrant.fr>)
List pgsql-hackers
Hi,

with 9.2.2 I can see harmless cosmetic defect while dumping/restoring database with postgis extension.

Steps to reproduce:

- create new database;
- CREATE EXTENSION IF NOT EXISTS postgis WITH SCHEMA public; 
- backup it;
- create new database and restore it from this new backup.


It produces 3 errors while executing these 3 statements:

CREATE RULE geometry_columns_delete AS ON DELETE TO geometry_columns DO INSTEAD NOTHING;
CREATE RULE geometry_columns_insert AS ON INSERT TO geometry_columns DO INSTEAD NOTHING;
CREATE RULE geometry_columns_update AS ON UPDATE TO geometry_columns DO INSTEAD NOTHING;   

All 3 errors are similar to this:

pg_restore: [archiver (db)] Error from TOC entry 3874; 2618 396850 RULE geometry_columns_delete postgres
pg_restore: [archiver (db)] could not execute query: ERROR:  rule "geometry_columns_delete" for relation "geometry_columns" already exists
    Command was: CREATE RULE geometry_columns_delete AS ON DELETE TO geometry_columns DO INSTEAD NOTHING;


This happens because in the beginning of backup file there is issued command 
CREATE EXTENSION IF NOT EXISTS postgis WITH SCHEMA public; 
which creates those rules.


Solution could be not to issue commands to create abovementioned rules, or issue 'CREATE OR REPLACE RULE' instead of 'CREATE RULE'.


As I understand these errors are harmless, I would say - cosmetic defects.


Best regards,

Grazvydas Valeika

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