Re: pg_dump multi VALUES INSERT - Mailing list pgsql-hackers

From Tom Lane
Subject Re: pg_dump multi VALUES INSERT
Date
Msg-id 27171.1539719339@sss.pgh.pa.us
Whole thread Raw
In response to pg_dump multi VALUES INSERT  (Surafel Temesgen <surafel3000@gmail.com>)
Responses Re: pg_dump multi VALUES INSERT  (Stephen Frost <sfrost@snowman.net>)
List pgsql-hackers
Surafel Temesgen <surafel3000@gmail.com> writes:
> According to the documentation –inserts option is mainly useful for making
> dumps that can be loaded into non-PostgreSQL databases and to reduce the
> amount of rows that might lost during error in reloading but multi values
> insert command are equally portable and compact and also faster to reload
> than single row statement. I think it deserve an option of its own

I don't actually see the point of this.  If you want dump/reload speed
you should be using COPY.  If that isn't your first priority, it's
unlikely that using an option like this would be a good idea.  It makes
the effects of a bad row much harder to predict, and it increases your
odds of OOM problems with wide rows substantially.

I grant that COPY might not be an option if you're trying to transfer
data to a different DBMS, but the other problems seem likely to apply
anywhere.  The bad-data hazard, in particular, is probably a much larger
concern than it is for Postgres-to-Postgres transfers.

            regards, tom lane


pgsql-hackers by date:

Previous
From: Robert Haas
Date:
Subject: Re: [RFC] Removing "magic" oids
Next
From: Andres Freund
Date:
Subject: Re: [PATCH] heap_insert() and heap_update() optimization