I had been running NC 23 without any errors and upgraded to 24.0.2. Then I got:
The database is missing some indexes. Due to the fact that adding indexes on big tables could take some time they were not added automatically. By running "occ db:add-missing-indices" those missing indexes could be added manually while the instance keeps running. Once the indexes are added queries to those tables are usually much faster.
So I ran:
sudo -u www-data php occ db:add-missing-indices
That gave me this:
An unhandled exception has been thrown:
Doctrine\DBAL\Exception: Failed to connect to the database: An exception occurred in the driver: could not find driver in /var/www/html/nextcloud/lib/private/DB/Connection.php:139
Stack trace:
#0 /var/www/html/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1519): OC\DB\Connection->connect()
#1 /var/www/html/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1041): Doctrine\DBAL\Connection->getWrappedConnection()
#2 /var/www/html/nextcloud/lib/private/DB/Connection.php(261): Doctrine\DBAL\Connection->executeQuery()
#3 /var/www/html/nextcloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php(345): OC\DB\Connection->executeQuery()
#4 /var/www/html/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php(281): Doctrine\DBAL\Query\QueryBuilder->execute()
#5 /var/www/html/nextcloud/lib/private/AppConfig.php(411): OC\DB\QueryBuilder\QueryBuilder->execute()
#6 /var/www/html/nextcloud/lib/private/AppConfig.php(176): OC\AppConfig->loadConfigValues()
#7 /var/www/html/nextcloud/lib/private/AppConfig.php(367): OC\AppConfig->getApps()
#8 /var/www/html/nextcloud/lib/private/legacy/OC_App.php(983): OC\AppConfig->getValues()
#9 /var/www/html/nextcloud/lib/private/Server.php(713): OC_App::getAppVersions()
#10 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(162): OC\Server->OC\{closure}()
#11 /var/www/html/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(122): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}()
#12 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(129): Pimple\Container->offsetGet()
#13 /var/www/html/nextcloud/lib/private/ServerContainer.php(136): OC\AppFramework\Utility\SimpleContainer->query()
#14 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(57): OC\ServerContainer->query()
#15 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(184): OC\AppFramework\Utility\SimpleContainer->get()
#16 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(162): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}()
#17 /var/www/html/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}()
#18 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(129): Pimple\Container->offsetGet()
#19 /var/www/html/nextcloud/lib/private/ServerContainer.php(136): OC\AppFramework\Utility\SimpleContainer->query()
#20 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(57): OC\ServerContainer->query()
#21 /var/www/html/nextcloud/lib/private/Server.php(1105): OC\AppFramework\Utility\SimpleContainer->get()
#22 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(162): OC\Server->OC\{closure}()
#23 /var/www/html/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(122): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}()
#24 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(129): Pimple\Container->offsetGet()
#25 /var/www/html/nextcloud/lib/private/ServerContainer.php(136): OC\AppFramework\Utility\SimpleContainer->query()
#26 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(57): OC\ServerContainer->query()
#27 /var/www/html/nextcloud/lib/private/Server.php(2082): OC\AppFramework\Utility\SimpleContainer->get()
#28 /var/www/html/nextcloud/lib/private/Files/View.php(122): OC\Server->getLockingProvider()
#29 /var/www/html/nextcloud/lib/private/Server.php(454): OC\Files\View->__construct()
#30 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(162): OC\Server->OC\{closure}()
#31 /var/www/html/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(122): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}()
#32 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(129): Pimple\Container->offsetGet()
#33 /var/www/html/nextcloud/lib/private/ServerContainer.php(136): OC\AppFramework\Utility\SimpleContainer->query()
#34 /var/www/html/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(57): OC\ServerContainer->query()
#35 /var/www/html/nextcloud/lib/private/Server.php(1445): OC\AppFramework\Utility\SimpleContainer->get()
#36 /var/www/html/nextcloud/lib/base.php(602): OC\Server->boot()
#37 /var/www/html/nextcloud/lib/base.php(1104): OC::init()
#38 /var/www/html/nextcloud/console.php(48): require_once('...')
#39 /var/www/html/nextcloud/occ(11): require_once('...')
#40 {main}
Nextcloud version: 24.0.2
Operating system and version : Ubuntu 20.04
Apache version : 2.4.54
PHP version : 7.4.30