Re: [GENERAL] how do I do dump and restore without bugging with constraint?

From: Net Tree Inc. <nettreeinc@gmail.com>
Subject: Re: [GENERAL] how do I do dump and restore without bugging with constraint?
To: pgsql-admin@postgresql.org, pgsql-general@postgresql.org
Date: Wednesday, 24 February, 2010, 1:57 AM

I see something related with Deferrable and Initially deferrable that seems like something could avoid constraints when dumping and restore, but it has to modify the table or re-create all of them to have such option (maybe is what you referraled "table definitions"). Is it what it can be use for to avoid during dumping and restoring?

DEFERRABLE
NOT DEFERRABLE

This controls whether the constraint can be deferred. A constraint that is not deferrable will be checked immediately after every command. Checking of constraints that are deferrable can be postponed until the end of the transaction (using the SET CONSTRAINTS command). NOT DEFERRABLE is the default. Only foreign key constraints currently accept this clause. All other constraint types are not deferrable.

INITIALLY IMMEDIATE
INITIALLY DEFERRED

If a constraint is deferrable, this clause specifies the default time to check the constraint. If the constraint is INITIALLY IMMEDIATE, it is checked after each statement. This is the default. If the constraint is INITIALLY DEFERRED, it is checked only at the end of the transaction. The constraint check time can be altered with the SET CONSTRAINTS command.

On Tue, Feb 23, 2010 at 12:50 PM, Net Tree Inc. <nettreeinc@gmail.com> wrote:

Hi all,

I am dumping both schema and data from old database to new one. The new database schema is somehow contain slightly different schema then the old one. When I do restore it shown alot errors related with constraints. How can I dump and to restore from old to new without dealing with constraint and just forces data dump to where it suppose to belong?

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Steven Huang