Re: Is sqlplus too slow to unload data?

Bruce,

SQLPlus:
set pages 0;
set lines 10000;
set termout off;
set trimspool on;
set trimout on;
set echo off;
set feedback off;
set verify off;
set recsep off;
set arraysize 2000;

PDQOut is 3rd party product I test. I also test the PL/SQL from Thomas Kyte's book. I call it from sqlplus, and the speed is only 1.5 time faster than sqlplus one. exp can achieve 500M/minute. However, I intend to change it as small as possible. I wonder if about 5M/minute is max speed for sqlplus.

Regards,
Bin

"Reardon, Bruce (CALBBAY)" wrote:

> Bin,
>
> Have you tried setting term off in your sqlplus session - what effect does this have?
> I would guess that the Pro*C program also uses Net8 so the problem would be in SQLPlus.
>
> Which 3rd party product did you try?
> Have you tested PDQOut from http://www.oriole.com - this is written in OCI.
> Also, I'm sure someone will suggest using Perl.
>
> HTH,
> Bruce Reardon
>
> -----Original Message-----
> Sent: Wednesday, 24 April 2002 14:53
>
> Hi,
> Our application uses sqlplus + sqlloader to transfer data between
> databases. It takes nearly four hours to unload to data to flat
> files(1G), which is far too slow. In the application, the query looks
> like the following. All those &3,&4,&5 are for sqlldr format.
> select ' ' ||
> '&4' || replace( replace ( ltrim(dealerid), '&4', '&4' ||
> '&4' ), CHR(10), CHR(10) || '&5' ) ||'&4'||'&3' ||
> ...
> from table_name f
> where eventdate >= to_date(&1)
> and eventdate <= to_date(&2);
> Firstly, there is nothing wrong with the query, since if I insert into a table
> it only takes less than 15 minutes. Therefore, there must be problem with either
> sqlplus or Networking.
> With sqlplus, I increase arraysize from 1 to 2000.
> With Networking, I put tcp.nodelay=yes on protocol.ora.
> Both doesn't work.
>
> I try thrid party software which is writen by Pro*C to download tables to flat
> file. Its speed is more than 60M/minute. I monitor v$session_event while it's
> running.The only different is event
> "SQL*Net message from client". In AVERAGE_WAIT and MAX_WAIT, the
> different is huge.
> sqlplus:
> TOTAL_WAITS TOTAL_TIMEOUTS TIME_WAITED AVERAGE_WAIT MAX_WAIT
> 49 0 5998 122.4 1004
> Pro*C:
> TOTAL_WAITS TOTAL_TIMEOUTS TIME_WAITED AVERAGE_WAIT MAX_WAIT
> 351 0 677 1.92 42
> What's the problem sqlplus or net8?
>
> BTW, dblink doesn't work since the two databases on isolated network.
> emp/imp is an option. However, I just try to find out what is wrong
> with sqlplus one.
> I test 8.0.5 and 8.1.7 on solaris 2.6-2.8.
>
> Thanks in advance,
> Bin
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Reardon, Bruce (CALBBAY)
> INET: Bruce.Reardon_at_comalco.riotinto.com.au
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Bin Wang
  INET: binw_at_lasseters.com.au

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
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