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Re: Database Comparison

by sundialsvc4 (Abbot)
on Jul 01, 2011 at 21:16 UTC ( #912414=note: print w/replies, xml ) Need Help??

in reply to Database Comparison

When you reach this volume of data, especially when they are on two different servers (hence... a network of some kind will now be involved ...), you're simply going to have to devise some strategy that will enable you to “divide and conquer.”

There are various possibilities to consider, depending on exactly what kind of comparisons you want to make.   For example, I once worked on a similar task where we pulled row-counts and MD5-sums of blocks of records, then compared those results, gradually zeroing-in on the differences.   (These queries focused on just one server at a time.)

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[stevieb]: did my pull request challenge today, Locale::gettext. Weird layout for a dist, and I have no idea how to use it, but it's always nice when you can force someone else's work be use strict; and use warnings; compliant :)
[stevieb]: ahem... s/no idea how to use it/didn't read enough as to what it's used for/
[stevieb]: interestingly enough, someone else got my Devel::Examine:: Subs distribution for their PRC, and I applaud the change. This dist is extremely complicated and mostly obfu, but the person doing it understood PPI enough to change...
[stevieb]: ...something I had overlooked in the extreme depths of the core functionality. After merging, then a couple of extra tweaks, I still have 100% test coverage. Yay for people who write tests!

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