Re: Is sqlplus too slow to unload data?

Hi Chris,

I test all settings. Only LINESIZE has improvement, which is huge. When I change it to 500, the speed is about 30M/m. However, the avarage of the line is about 2100. So I have to increase it to 2500, then the speed drops to 11M/m. It appears that it does reach the limitation of sqlplus.

Thanks,
Bin

Christopher.Jones_at_oracle.comX wrote in message news:<uy9f5292i.fsf_at_oracle.comX>...
> wangbin_at_start.com.au (wangbin) writes:
>
> > Thanks for all reply.
> >
> > Sybrand,
> > The following is my set parameters in sqlplus. The result is the same.
> > set pages 0;
> > set lines 10000;
>
> If you do end up using SQL*Plus for this task you might want to
> benchmark these settings as well:
>
> SET SERVEROUTPUT OFF
> SET APPINFO OFF
> SET DEFINE OFF
> SET AUTOPRINT OFF
>
> Play with SET TAB and SET FLUSH. Tune LONGCHUNKSIZE if LONGS or LOBs
> are being fetched. Keep LINESIZE as small as possible to avoid extra
> memory allocations/copying.
>
> Chris
Received on Tue Apr 30 2002 - 22:32:14 CDT