https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=26457 --- Comment #5 from didier <didier.gautheron@biblibre.com> --- (In reply to David Cook from comment #4)
I see that itemnumber_idx is redundant, but how is issuesborridx redundant? It's not the same as bordate.
bordate is a composed index with borrowernumber first and mysql is able to use it for search on borrowernumber only. explain select * from issues where borrowernumber = 3; +------+-------------+--------+------+-----------------------+---------------+---------+-------+------+-------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +------+-------------+--------+------+-----------------------+---------------+---------+-------+------+-------+ | 1 | SIMPLE | issues | ref | issuesborridx,bordate | issuesborridx | 5 | const | 1 | | +------+-------------+--------+------+-----------------------+---------------+---------+-------+------+-------+ drop index issuesborridx on issues; explain select * from issues where borrowernumber = 3; +------+-------------+--------+------+---------------+---------+---------+-------+------+-------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +------+-------------+--------+------+---------------+---------+---------+-------+------+-------+ | 1 | SIMPLE | issues | ref | bordate | bordate | 5 | const | 1 | | +------+-------------+--------+------+---------------+---------+---------+-------+------+-------+
I'll try, maybe adding a fat sleep(5) in transaction block.
Certainly worth experimenting.
I did it but was unable to reproduce the deadlock even with a sleep(5) and 8 concurrent plack workers. -- You are receiving this mail because: You are the assignee for the bug. You are watching all bug changes.