[Koha-bugs] [Bug 13740] Timeout on deleting patrons if too many patrons

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=13740

--- Comment #10 from sandboxes at biblibre.com <sandboxes at biblibre.com> ---
Created attachment 36410
  -->
http://bugs.koha-community.org/bugzilla3/attachment.cgi?id=36410&action=edit
Bug 13740: Remove the NOT NULL clause in GetBorrowersToExpunge

C4::Borrowers::GetBorrowersToExpunge should not use a "NOT IN", it is
not efficient at all.

With only 1 guarantor and more than 136k patrons, the not in clause in
this subroutine takes ages:
mysql> select count(*) FROM   borrowers where  borrowernumber NOT IN
(SELECT guarantorid FROM borrowers WHERE guarantorid IS NOT NULL AND
guarantorid <> 0) ;
[...]

not ended after 5min

With the query modified by this patch, the results come after 1 sec :)

Test plan:
Verify the delete_patrons.pl cronjob or the cleanborrowers tools work as
before.
Especially with guarantors.

Signed-off-by: Brendan Gallagher <brendan at bywatersolutions.com>

Signed-off-by: Koha Team AMU <koha.aixmarseille at gmail.com>

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