I was testing an AbuseFilter rule on itwiki, and specified in the form an username and selected the option to only show account creations. The user only had a single edit, so I expected a relatively quick query. However, after some time, I got the following error:
MediaWiki internal error. Original exception: [W5pXBgrAEEYAAHVt@m4AAADX] 2018-09-13 12:25:39: Fatal exception of type "Wikimedia\Rdbms\DBQueryTimeoutError" Exception caught inside exception handler. Set $wgShowExceptionDetails = true; at the bottom of LocalSettings.php to show detailed debugging information.
I'd like to see the query that caused the timeout, to see if it's generated wrongly, or if it needs a performance boost in other ways.