Sorry I'm no expert either but did you check if there are any suspicious slow queries? https://www.a2hosting.com/kb/developer-corner/mysql/enabling-the-slow-query-... By setting the time to a very low number you get almost tracing... but then again you could probably use a better way to track all queries. Am 21.06.21 um 08:42 schrieb Chris Brown:
Dear Koha Community
Following up my post on 12 June I am repeating my call for help as Koha is effectively unusable right now at one of our libraries.
We are running Koha 19.11 on Debian 9.11 (stretch). This supports 5 Koha instances for some of the volunteer-run libraries in Sheffield. It has been stable and working fine for many months.
Currently we have a serious problem with one of these instances. Any attempt to check out a book hangs (never completes) and we see /usr/share/koha/intranet/cgi-bin/circ/circulation.pl consuming most of the CPU cycles (stuck in a loop perhaps?). On one occasion I noticed it was renew.pl consuming all the CPU.
I have tried disabling plack for this instance, and have rebuilt the zebra index, but the problem persists. There is nothing obvious reported in the log files, though I may not be looking in the right places. I cannot see any obvious problems with the configuration, though again I might be looking at the wrong things. The other 4 instances are working OK.
*Any advice on how to debug or fix this would be greatly appreciated.*
Does anyone know how to turn on tracing of MySQL transactions? I was wondering if looking at the activity at the database end might help.
Thanks and Best Regards,
Chris Brown (Voluntary Libraries in Sheffield) _______________________________________________
Koha mailing list http://koha-community.org Koha@lists.katipo.co.nz Unsubscribe: https://lists.katipo.co.nz/mailman/listinfo/koha