07-02-2015
If the data can be sorted hierarchically first (man sort) on the key starting with rltp_id, then prod_id, then cust_id, then tnx_id... then you can write script in a single pass to convert the data (trying to give hints rather than doing your homework).
20 million records... well... takes more space than most, but very doable...
You could use perl or awk to do this (or python or ruby or whatever)... You could use shell (bourne shell script variants), but might not be as easy especially since you want it to be relatively fast and also avoid duplicates.
I'm not trying to be mean, just trying to encourage your own work.
If you get too frustrated I might whip up a bourne (pure) example just as a challenge....
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LEARN ABOUT DEBIAN
xml::handler::canonxmlwriter
XML::Handler::CanonXMLWriter(3pm) User Contributed Perl Documentation XML::Handler::CanonXMLWriter(3pm)
NAME
XML::Handler::CanonXMLWriter - output XML in canonical XML format
SYNOPSIS
use XML::Handler::CanonXMLWriter;
$writer = XML::Handler::CanonXMLWriter OPTIONS;
$parser->parse(Handler => $writer);
DESCRIPTION
"XML::Handler::CanonXMLWriter" is a PerlSAX handler that will return a string or write a stream of canonical XML for an XML instance and
it's content.
"XML::Handler::CanonXMLWriter" objects hold the options used for writing the XML objects. Options can be supplied when the the object is
created,
$writer = new XML::Handler::CanonXMLWriter PrintComments => 1;
or modified at any time before calling the parser's `"parse()"' method:
$writer->{PrintComments} = 0;
OPTIONS
IOHandle
IOHandle contains a handle for writing the canonical XML to. If an IOHandle is not provided, the canonical XML string will be returned
from `"parse()"'.
PrintComments
By default comments are not written to the output. Setting comment to a true value will include comments in the output.
AUTHOR
Ken MacLeod, ken@bitsko.slc.ut.us
SEE ALSO
perl(1), PerlSAX
James Clark's Canonical XML definition <http://www.jclark.com/xml/canonxml.html>
perl v5.10.1 2003-10-21 XML::Handler::CanonXMLWriter(3pm)