Re: really quick multiple inserts can use COPY?

["Jens Schipkowski" <jens(dot)schipkowski(at)apus(dot)co(dot)at>]

Thanks a lot to all for your tips.

Of course, I am doing all the INSERTs using a transaction. So the cost per  
INSERT dropped from 30 ms to 3 ms.
The improvement factor matches with the hint by Brian Hurt.
Sorry, I forgot to mention we are using PostgreSQL 8.1.4.
Thanks for the code snippet posted by mallah. It looks like you are using  
prepared statements, which are not available to us.
But I will check our database access if its possible to do a workaround,  
because this looks clean and quick to me.

regards
Jens Schipkowski


On Mon, 11 Dec 2006 17:53:52 +0100, Guillaume Cottenceau <gc(at)mnc(dot)ch> wrote:

> "Jens Schipkowski" <jens.schipkowski 'at' apus.co.at> writes:
>
> > Hello!
> >
> > In our JAVA application we do multiple inserts to a table by data from
> > a  Hash Map. Due to poor database access implemention - done by
> > another  company (we got the job to enhance the software) - we cannot
> > use prepared  statements. (We are not allowed to change code at
> > database access!)
> > First, we tried to fire one INSERT statement per record to insert.
> > This  costs 3 ms per row which is to slow because normally we insert
> > 10.000  records which results in 30.000 ms just for inserts.
> >
> > for(){
> > sql = "INSERT INTO tblfoo(foo,bar)  
> > VALUES("+it.next()+","+CONST.BAR+");";
> > }
>
> You should try to wrap that into a single transaction. PostgreSQL
> waits for I/O write completion for each INSERT as it's
> implicitely in its own transaction. Maybe the added performance
> would be satisfactory for you.



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