Re: How long should it take to insert 200,000 records?

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От Mark Lewis
Тема Re: How long should it take to insert 200,000 records?
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Msg-id 1170786686.16656.484.camel@archimedes
обсуждение исходный текст
Ответ на Re: How long should it take to insert 200,000 records?  ("Merlin Moncure" <mmoncure@gmail.com>)
Ответы Re: How long should it take to insert 200,000 records?  (Bruno Wolff III <bruno@wolff.to>)
Re: How long should it take to insert 200,000 records?  ("Merlin Moncure" <mmoncure@gmail.com>)
Список pgsql-performance
On Tue, 2007-02-06 at 12:01 -0500, Merlin Moncure wrote:
> On 2/6/07, Scott Marlowe <smarlowe@g2switchworks.com> wrote:
> > On Tue, 2007-02-06 at 10:40, Merlin Moncure wrote:
> > > On 2/6/07, Scott Marlowe <smarlowe@g2switchworks.com> wrote:
> > > > On Mon, 2007-02-05 at 18:35, Karen Hill wrote:
> > > > > I have a pl/pgsql function that is inserting 200,000 records for
> > > > > testing purposes.  What is the expected time frame for this operation
> > > > > on a pc with 1/2 a gig of ram and a 7200 RPM disk?   The processor is
> > > > > a 2ghz cpu.  So far I've been sitting here for about 2 million ms
> > > > > waiting for it to complete, and I'm not sure how many inserts postgres
> > > > > is doing per second.
> > > >
> > > > That really depends.  Doing 200,000 inserts as individual transactions
> > > > will be fairly slow.  Since PostgreSQL generally runs in autocommit
> > > > mode, this means that if you didn't expressly begin a transaction, you
> > > > are in fact inserting each row as a transaction.  i.e. this:
> > >
> > > I think OP is doing insertion inside a pl/pgsql loop...transaction is
> > > implied here.
> >
> > Yeah, I noticed that about 10 seconds after hitting send... :)
>
> actually, I get the stupid award also because RI check to unindexed
> column is not possible :)  (this haunts deletes, not inserts).

Sure it's possible:

CREATE TABLE parent (col1 int4);
-- insert many millions of rows into parent
CREATE TABLE child  (col1 int4 REFERENCES parent(col1));
-- insert many millions of rows into child, very very slowly.


- Mark Lewis



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