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
ruby-prof
RUBY-PROF(1) General Commands Manual RUBY-PROF(1)
NAME
ruby-prof - A fast ruby profiler
SYNOPSIS
ruby-prof [options] <script.rb> [ script-options ]
DESCRIPTION
ruby-prof is a fast profiler for ruby. It can be used as a stand-alone program (that this man page documents) or as a ruby library. Simply
run the ruby program you want to profile using ruby-prof : ruby-prof script.rb At the end of execution the time spent in each method is
displayed.
OPTIONS
-p, --printer=printer
Select a printer:
flat - Prints a flat profile as text (default).
graph - Prints a graph profile as text.
graph_html - Prints a graph profile as html.
call_tree - format for KCacheGrind
-m, --min_percent=min_percent
The minimum percent a method must take before being included in output reports. This option is not supported for call tree.
-f, --file=path
Output results to a file instead of standard out.
--mode=measure_mode
Select what ruby-prof should measure
process - Use process time (default).
wall - Use wall time.
cpu - Use the CPU clock counter (only supported on Pentium and PowerPCs).
--replace-progname
Replace $0 when loading the ruby source file.
-h, --help
Show help message.
-v, --version
Show version.
SEE ALSO
The ruby-prof website, http://ruby-prof.rubyforge.org/
AUTHOR
ruby-prof was written by Shugo Maeda <shugo@ruby-lang.org>.
This manual page was written by Arnaud Cornet <arnaud.cornet@gmail.com> for the Debian project (but may be used by others).
14 October 2006 RUBY-PROF(1)