[Koha-bugs] [Bug 20377] Various speed tweaks to 'remove_unused_authorities.pl' script

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https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=20377

--- Comment #1 from Mason James <mtj at kohaaloha.com> ---
Created attachment 72727
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=72727&action=edit
Bug 20377: Various speed tweaks to 'remove_unused_authorities.pl' script

Here is a patch to make 'remove_unused_authorities.pl' a bit faster
i get a 5x speedup after this patch

fyi: i pinched most of this patch from bulkmarcimport.pl

1/ import a bunch of authority record into a Koha, and index

2/ run script, note execution time
  $ time perl ./misc/migration_tools/remove_unused_authorities.pl
  real    0m50s

3/ apply patch

4/ run script again, and notice it's a bit faster
  $ time perl ./misc/migration_tools/remove_unused_authorities.pl
  real    0m10s

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