RE: Query results to .csv

Taniel, Binley

   Thanks for the excellent suggestions.    At this point we have been testing with two smaller test systems, moving a single table at a time, but initial indications are that the performance order is:

1. Perl dump to CSV / ftp / SQL*Loader
2. Copy across database link
3. Export/ ftp / import

I need to re-run the tests once the target production system is available to re-confirm which is faster. I am pretty confident in the ability to run multiple SQL*Loader and import sessions simultaneously. I am a little nervous about the ability of the database link to scale to enough simultaneous sessions to keep the RAID sets maxed out on the target system. Several years ago when I was doing a large conversion I hit that limit. Some days I wonder if we are the beneficiary or victim of our prior experience. Oh well thanks for all the good suggestions, on to testing, testing, testing.

Dennis Williams
DBA, 80%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Monday, August 25, 2003 7:09 PM
To: Multiple recipients of list ORACLE-L

Hi!

What about several insert /*+ APPEND NOLOGGING */ commands over database link run in parallel? (Possibly over dedicated network). This is fast and is easier (in case you don't hit any compatibility problems). If you happen to be running on Windows for some reason, you could try to use named pipes network protocol instead of TCP as well.

Tanel.

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, August 25, 2003 11:04 PM

> Thanks Tanel
> We will undoubtedly use export/import for the many small tables. We are
> looking for alternatives that will perform even faster. The insert phase
> seems to be the slowest part, and that is where SQL*Loader in direct path
> really shines. Now the next issue is how to produce a CSV file as fast as
> possible, and so far it looks like Jared's Perl program is the clear
winner.
>
> Dennis Williams
> DBA, 80%OCP, 100% DBA
> Lifetouch, Inc.
> dwilliams_at_lifetouch.com
>
>
> -----Original Message-----
> Sent: Monday, August 25, 2003 1:05 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Hi!
>
> Spooling from sqlplus is VERY slow.
> Is the source database Oracle? Then use export/import
> If not, is there an ODBC driver for source database? Then use Oracle
> heterogenous services and do your transfer directly, without any
> intermediate files.
> Or use some very expensive software for doing this simple job...
>
> Tanel.
> P.S. if you definitely want to spool to textfile fast, Sparky could be
what
> you want...
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Monday, August 25, 2003 7:24 PM
>
>
> > Jared - Thanks for posting this. At the moment, we are preparing to move
> > large database to a new server. Based on the advice you posted several
> > months ago, we have been testing SQL*Loader and as you predicted, it is

> > indeed fast. But also as you predicted, using SQL*Plus to create a CSV
> isn't
> > very fast. Am I correct in assuming the dump.sql will not be the best
> choice
> > for large tables? We are installing perl since you mentioned that would
> > probably be much faster.
> >
> > Dennis Williams
> > DBA, 80%OCP, 100% DBA
> > Lifetouch, Inc.
> > dwilliams_at_lifetouch.com
> >
> >
> > -----Original Message-----
> > Sent: Monday, August 25, 2003 9:40 AM
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > http://www.cybcon.com/~jkstill/util/dump/dump.html
> >
> > On Mon, 2003-08-25 at 05:39, Imran Ashraf wrote:
> > > Hi,
> > >
> > > Whats the best way to write the results of a SQL query to a CSV file?
> > >
> > > Thanks.
> > >
> > > _________________________________________________________________
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