PostgreSQL version: 8.0.0beta1
Operating system : Solaris 9
Backups created by pg_dump/pg_dumpall don't set the ownership of
implicitly-created sequences. When backups are restored, users who
created sequences may not be able to use them.
How to repeat:
1. Create a test user and a test database.
createuser -P -Upostgres testuser
Enter password for new user: ********
Enter it again: ********
Shall the new user be allowed to create databases? (y/n) n
Shall the new user be allowed to create more new users? (y/n) n
createdb -Upostgres testdb
2. Connect to the test database as the test user, create explicit
and implicit sequences, then list the sequences.
psql -Utestuser testdb
CREATE SEQUENCE test_seq;
CREATE TABLE stuff (id SERIAL PRIMARY KEY, name TEXT NOT NULL);
\ds
List of relations
Schema | Name | Type | Owner
--------+--------------+----------+----------
public | stuff_id_seq | sequence | testuser
public | test_seq | sequence | testuser
(2 rows)
3. Make a backup of the test database.
pg_dump -Upostgres testdb > backup.sql
4. Drop the test database.
dropdb -Upostgres testdb
5. Recreate the test database and restore it.
createdb -Upostgres testdb
psql -Upostgres -f backup.sql testdb
6. Connect to the test database as the test user, show the sequences,
and try to use the implicitly-created one.
psql -Utestuser testdb
\ds
List of relations
Schema | Name | Type | Owner
--------+--------------+----------+----------
public | stuff_id_seq | sequence | postgres
public | test_seq | sequence | testuser
(2 rows)
SELECT nextval('stuff_id_seq');
ERROR: permission denied for sequence stuff_id_seq
pg_dump sets the ownership of the explicitly-created sequence via
an ALTER TABLE statement (I see ALTER SEQUENCE ... OWNER TO on the
TODO list):
ALTER TABLE public.test_seq OWNER TO testuser;
No such statement is issued for the implicitly-created sequence,
resulting in the sequence being owned by the user who restored the
database. This would typically be a database superuser.
Is this a bug in pg_dump/pg_dumpall, or is it a bug in the ALTER
TABLE ... OWNER TO statement that set the ownership of the table
that implicitly created the sequence? It seems reasonable that
changing a table's ownership should also change the ownership of
any implicitly-created sequences, or has that already been discussed
and rejected?
Thanks.
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/
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