Re: What is the fastest way to dump oracle data into a human

I also have one in Perl that I use to dump an entire schema to flat files, generating sqlldr parameter and control files as is goes.

sqlunldr.pl is part of the PDBA toolkit:

http://www.oreilly.com/catalog/oracleperl - click on 'Toolkit'

Jared

On Sat, 2004-01-10 at 19:39, Rachel Carmichael wrote:
> Jared has a utility to dump tables to flat files....
>
> http://www.cybcon.com/~jkstill/util/
>
> on the lefthand menu, under Utilities.... click on Dump Tables to Flat
> Files
>
>
> --- Guang Mei <gmei_at_incyte.com> wrote:
> > Hi:
> >
> > I have a program (running on oracle 8173 server) that writes 48
> > Millions
> > lines of data into various text files . The selected data is from
> > various
> > tables and I have the query pretty much optimized. Now I am trying to
> > find
> > the fastest way to dump the selected data into a text file on the
> > same
> > oracle server. The program (written as a pl/sql package) now works
> > something like this:
> >
> > str varchar2(32767) := '';
> > NL char(1) := chr(10); -- new line character
> > begin
> > fpn := utl_file.fopen(directory, filename, 'w', 32767);
> > for x in cur1 loop
> > str := str || x.str || NL; -- keep building the str
> > if (length (str) > 31000 ) then
> > str := substr (str,1, length(str) -1 );
> > utl_file.put_line(fpn, str);
> > str := '';
> > end if;
> > end loop;
> >
> > -- dump the last part:
> > str := substr (str,1, length(str) -1 );
> > utl_file.put_line(fpn, str);
> > utl_file.fflush(fpn);
> > utl_file.fclose(fpn);
> > end ;
> >
> >
> > The above code works perfect fine now. But I am wondering if there is
> > another way that could increase the writing siginificantly faster.
> > This
> > porgram does not have to be in pl/sql. I can think of a couple of
> > potential approaches:
> >
> > 1. Write a perl program, basically using perl's DBI/DBD to select the
> > data
> > from the database, then calling perl's "print" to write data into a
> > file.
> > I have not tested this and don't know if it is faster that
> > utl_file.put_line.
> >
> > 2. Write a C program, using ProC to talk to DB, then use C's fopen
> > and
> > fwrite(?) to dump data into text file.
> >
> > 3. Write a C program,using OCI to talk to DB, then use C's fopen and
> > fwrite(?) to dump data into text file.
> >
> > I don't have direct experience with ProC and OCI, so I don't know how
> > faster (or any) it would be by doing Option 2 or 3 above. Does
> > anyone
> > know if I would see siginificant performance boost by using C? Any
> > other
> > suggestions?
> >
> > TIA.
> >
> > Guang
> >
> >
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > --
> > Author: Guang Mei
> > INET: gmei_at_incyte.com
> >
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> Please see the official ORACLE-L FAQ: http://www.orafaq.net
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> Author: Rachel Carmichael
> INET: wisernet100_at_yahoo.com
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Jared Still
  INET: jkstill_at_cybcon.com

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also send the HELP command for other information (like subscribing).