Sometimes I can see the following error within the log file:
{“reqId”:“rIAHGLPbsE2Lll2yEi81”,“level”:3,“time”:“2021-04-08T16:36:51+02:00”,“remoteAddr”:“x.x.x.x”,“user”:“username”,“app”:“core”,“method”:“PROPFIND”,“url”:"/remote.php/webdav/Handy/Fotos/",“message”:{“Exception”:“Doctrine\DBAL\Query\QueryException”,“Message”:“More than 1000 expressions in a list are not allowed on Oracle.”,“Code”:0,“Trace”:[{“file”:"/var/www/nextcloud/lib/private/Comments/Manager.php",“line”:657,“function”:“execute”,“class”:“OC\DB\QueryBuilder\QueryBuilder”,“type”:"->",“args”:[]},{“file”:"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/CommentPropertiesPlugin.php",“line”:89,“function”:“getNumberOfUnreadCommentsForObjects”,“class”:“OC\Comments\Manager”,“type”:"->",“args”:[“files”,[“32299”,“32298”,“32303”,“32451”,“32452”,“And 1430 more entries, set log level to debug to see all entries”],{“class”:“OC\User\User”}]},{“file”:"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/CommentPropertiesPlugin.php",“line”:117,“function”:“cacheDirectory”,“class”:“OCA\DAV\Connector\Sabre\CommentPropertiesPlugin”,“type”:"->",“args”:[{“class”:“OCA\DAV\Connector\Sabre\Directory”}]},{“file”:"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php",“line”:89,“function”:“handleGetProperties”,“class”:“OCA\DAV\Connector\Sabre\CommentPropertiesPlugin”,“type”:"->",“args”:[{“class”:“Sabre\DAV\PropFind”},{“class”:“OCA\DAV\Connector\Sabre\Directory”}]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php",“line”:1052,“function”:“emit”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[“propFind”,[{“class”:“Sabre\DAV\PropFind”},{“class”:“OCA\DAV\Connector\Sabre\Directory”}]]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php",“line”:984,“function”:“getPropertiesByNode”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[{“class”:“Sabre\DAV\PropFind”},{“class”:“OCA\DAV\Connector\Sabre\Directory”}]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php",“line”:1661,“function”:“getPropertiesIteratorForPath”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[“Handy/Fotos”,["{http://owncloud.org/ns}owner-id","{DAV:}creationdate","{DAV:}getetag","{http://owncloud.org/ns}permissions","{DAV:}getlastmodified",“And 15 more entries, set log level to debug to see all entries”],1]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php",“line”:1646,“function”:“writeMultiStatus”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[{“elementMap”:[],“contextUri”:"/remote.php/webdav/",“namespaceMap”:{“DAV:”:“d”,“http://sabredav.org/ns":“s”,“http://owncloud.org/ns”:“oc”,“http://nextcloud.org/ns”:“nc”},“classMap”:[],"class”:“Sabre\Xml\Writer”},{“class”:“Generator”},false]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php",“line”:346,“function”:“generateMultiStatus”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[{“class”:“Generator”},false]},{“file”:"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php",“line”:89,“function”:“httpPropFind”,“class”:“Sabre\DAV\CorePlugin”,“type”:"->",“args”:[{“class”:“Sabre\HTTP\Request”},{“class”:“Sabre\HTTP\Response”}]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php",“line”:472,“function”:“emit”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[“method:PROPFIND”,[{“class”:“Sabre\HTTP\Request”},{“class”:“Sabre\HTTP\Response”}]]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php",“line”:253,“function”:“invokeMethod”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[{“class”:“Sabre\HTTP\Request”},{“class”:“Sabre\HTTP\Response”}]},{“file”:"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php",“line”:321,“function”:“start”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[]},{“file”:"/var/www/nextcloud/apps/dav/appinfo/v1/webdav.php",“line”:84,“function”:“exec”,“class”:“Sabre\DAV\Server”,“type”:"->",“args”:[]},{“file”:"/var/www/nextcloud/remote.php",“line”:167,“args”:["/var/www/nextcloud/apps/dav/appinfo/v1/webdav.php"],“function”:“require_once”}],“File”:"/var/www/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php",“Line”:267,“CustomMessage”:“More than 1000 expressions in a list are not allowed on Oracle.”},“userAgent”:“Mozilla/5.0 (Android) Nextcloud-android/3.15.1”,“version”:“21.0.0.18”,“id”:“606f452abe056”}
Nextcloud version (eg, 20.0.5): 21.0.0.18
Operating system and version (eg, Ubuntu 20.04): DEBIAN 10 (buster)
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.38 (Debian)
PHP version (eg, 7.4): 7.3