WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
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:140
Stack trace:
#0 /var/www/html/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1531): OC\DB\Connection->connect()
#1 /var/www/html/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1029): Doctrine\DBAL\Connection->getWrappedConnection()
#2 /var/www/html/nextcloud/lib/private/DB/Connection.php(262): 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(280): Doctrine\DBAL\Query\QueryBuilder->execute()
(後略)