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Re: ETL optimization

From: Bricklen Anderson <BAnderson(at)PresiNET(dot)com>
To: Dennis Bjorklund <db(at)zigo(dot)dhs(dot)org>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: ETL optimization
Date: 2005-06-27 18:15:06
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Dennis Bjorklund wrote:
> On Thu, 23 Jun 2005, Bricklen Anderson wrote:
>>iii. UNIQUE constraint on table "t1". This didn't seem to perform too
>>badly with fewer rows (preliminary tests), but as you'd expect, on error
>>the whole transaction would roll back. Is it possible to skip a row if
>>it causes an error, as opposed to aborting the transaction altogether?
> You don't need to roll back the whole transaction if you use savepoints or 
> the exception features in pl/pgsql
> Take a look at this example:
Hmmm... forgot about savepoints. That's an interesting idea that I'll have to
check out. I earlier mentioned that I was going to test the delete + insert
version, and it works pretty well. I got it down to about 3 minutes using that
method. I'll test the savepoint and the exception version that you listed as well.



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