One installation I help with keeps throwing a MYISAM error that is related to a temporary table, as well as a "Missing Log Tables" error (which I assume is related as they always appear together). If I clear caches, the table disappears and the errors in the system status go away, but they comes back later.

Based on some grepping, it seems this is a "durable" temporary table, generated in civicrm/CRM/Utils/SQL/TempTable.php -- is there some way in this file that should be specifying INNODB? Or is there a configuration setting on my server/database that isn't set right?

Table name: civicrm_tmp_d_dflt_randomstringofnumbersandlettershere

  • 1
    I have exactly the same problem. "Your database is configured to use the MyISAM database engine. CiviCRM requires InnoDB. You will need to convert any MyISAM tables in your database to InnoDB. Using MyISAM tables will result in data integrity issues." Example Table Name: civicrm_tmp_d_dflt_10ff2cc4b9e8b982843a5ac5673eda2c Created when I export a .cvs file from a search. System Status::Clean up Caches makes the tables and the error go away. Drupal 7.60 CiviCRM 5.60 PHP 7.2.10 MySQL DB 5.5.5-10.2.18-MariaDB
    – Larry Lowe
    Oct 22, 2018 at 19:06
  • unlikely but does it relate to this recent ticket about tmp table problems? civicrm.stackexchange.com/questions/26960/…
    – petednz - fuzion
    Oct 25, 2018 at 17:38
  • @petednz-fuzion The missing log tables portion may be -- testing the patch from that ticket.
    – Laryn
    Oct 25, 2018 at 17:44

1 Answer 1


I had a server tech look at this and it looks like this installation is on a server that has been upgraded from some time back, but retained an old setting:

It looks like the default engine set within /etc/my.cnf was still set to MyISAM...

We are in process of updating that and will restart MySQL in the middle of the night soon. I'm assuming this will fix it (but will update here if not).

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.