http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=13740
Bug ID: 13740
Summary: Timeout on deleting patrons if too many patrons
Change sponsored?: ---
Product: Koha
Version: master
Hardware: All
OS: All
Status: ASSIGNED
Severity: normal
Priority: P5 - low
Component: Architecture, internals, and plumbing
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
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
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