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Re: Upgrade time, dump+restore trouble.

From: Jesper Krogh <jesper(at)krogh(dot)cc>
To: pgsql-admin(at)postgresql(dot)org
Subject: Re: Upgrade time, dump+restore trouble.
Date: 2007-10-17 19:11:17
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
Tom Lane wrote:
> Jesper Krogh <jesper(at)krogh(dot)cc> writes:
>> The tables are running a "home-made" timetravelling feature where a
>> contraint on the table implements the foreing keys on the table.
> You mean you have check constraints that do selects on other tables?

Yes. We do.. we have to .. in order to perserve the foreing-keys.
What we have in short is:
Added two timestamps on each columns, starttime,endtime. When endtime is
"null" the record is "current" and a view exposes this from the table.
The foreing keys are then implemented using contraints that look up the
id in the foreing table and ensures that there is a record where the
endtime is null present

> You have just found out (one reason) why that's a bad idea.

Do you have any other reasons?

>> How can I instruct pg_dumpall to turn off these constriants during
>> dump/restore?
> Drop the constraints in the source database.

That would be my workaround for the problem. But isn't it somehow
desirable that pg_dumpall | psql "allways" would work?

Jesper Krogh, jesper(at)krogh(dot)cc

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