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pg_dump --data-only problem with PgSQL 8.0

From: Jani Averbach <jaa(at)jaa(dot)iki(dot)fi>
To: pgsql-admin(at)postgresql(dot)org
Subject: pg_dump --data-only problem with PgSQL 8.0
Date: 2005-01-24 18:16:56
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
Hello, I have a following problem:

In short: I can't reload pg_dump --data-only dump (ver. 8.0) back to
the database, because the loading will violate ref. integrity.

The long story:

We have a PgSQL 7.2.5 database, and we like to bring only the data to
the PgSQL 8.0 system. So I did following:

1) dump 7.2.5 database with:
       pg_dump \
            "--data-only" \
            "--column-inserts" \
            "--use-set-session-authorization" \
            old_db >

2) Create a schema on the new PgSQL system: new_db 

3) Load the old data to the new system:
        psql new_db < 

So far, so good, the loading succeeded. Now If continue, 
the following won't work:

4) Dump only data from just created 8.0 database:
       pg_dump \
            "--data-only" \
            "--column-inserts" \
            "--use-set-session-authorization" \
            new_db >

5) Re-Create the new_db:
       dropdb new_db; createdb new_db new_db

6) Try to reload data which was dumped from new ver 8.0 database:
        psql new_db <

This will fail with lots of these kinds of errors:
         ERROR:  insert or update on table "mytable" 
         violates foreign key constraint "mytable_myattr_fkey"

However, If I take a data+schema dump after step #3,

7) Dump data and schema from new database:
        pg_dump "--use-set-session-authorization" \
               new_db >  new_db.dump

8) And load that, it will succeed:
     dropdb new_db; createdb new_db
     psql new_db < new_db.dump

What I am doing wrong? Or have I found an ordering bug with pg_dump
when you are doing "--data-only" dumps?

These two databases are living in different machines, so there can't be
any version mismatch between pg_dump, psql and databases.

Thanks for any help,

Jani Averbach 


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Subject: Re: Postgres 8.0 Backups
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