The Basics
- Nextcloud Server version (e.g., 29.x.x):
- `now 31.0.1.2
- earlier 30.?`
- Operating system and version (e.g., Ubuntu 24.04):
Raspberry Pi OS Debian 12 (Bookworm)
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
Downloaded .zip
Summary of the issue you are facing:
[This came about by trying to run this command line:
sudo -u www-data /var/www/html/nextcloud/occ db:convert-type -vv --password=XXXXXX --clear-schema mysql XXXXXX localhost nextcloud
Originally, with version 30, I got this error:
SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect string value: ‘\xF0\x9F\x8E\x82 H…’ for column nextcloud.oc_calendarobjects_props.value at row 1
I then upgraded to 31.0.1.2 and run the command line again, thi time getting a different error:
Database error when running migration 14000Date20180404140050 for app core
An exception occurred while executing a query: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database
Although the config.php file explicitly states that the database type is ‘sqlite3’ AND there exists an active owncloud.db in the nextcloud/data folder, I was under the impression that a mysql database was also being actively worked as there were also active entries in it - or what appears to be active entries.
It appears that the ‘–clear-schema’ clause worked because after running the command line there is a schema structure with only 6 entries in the oc_migrations table.
The owncloud.db sqlite3 file in nextcloud/data is owned www-data:www-data and is mode 644.
The nextcloud mysql database is in folder /var/lib/mysql/nextcloud which is owned mysql:mysql with mode d700 and the files therein are owned mysql:mysql with mode 660.
Are these correct? What do they need to be?]
Log entries
Below is the single relevant line as defined by the id. Which database is this trying to access - sqlite3 or mysql?
Nextcloud
Please provide the log entries from your Nextcloud log that are generated during the time of problem (via the Copy raw option from Administration settings->Logging screen or from your nextcloud.log located in your data directory). Feel free to use a pastebin/gist service if necessary.
{"reqId":"IbAP6lk0SZHvQK2CnFrk","level":3,"time":"2025-03-22T01:55:27+00:00","remoteAddr":"110.141.219.107","user":"howard","app":"index","method":"POST","url":"/nextcloud/index.php/login","message":"An exception occurred while executing a query: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database","userAgent":"Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36","version":"31.0.1.2","exception":{"Exception":"OC\\DB\\Exceptions\\DbalException","Message":"An exception occurred while executing a query: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database","Code":8,"Trace":[{"file":"/var/www/html/nextcloud/lib/private/DB/ConnectionAdapter.php","line":69,"function":"wrap","class":"OC\\DB\\Exceptions\\DbalException","type":"::"},{"file":"/var/www/html/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php","line":306,"function":"executeStatement","class":"OC\\DB\\ConnectionAdapter","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Config/UserConfig.php","line":1187,"function":"executeStatement","class":"OC\\DB\\QueryBuilder\\QueryBuilder","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Config/UserConfig.php","line":843,"function":"setTypedValue","class":"OC\\Config\\UserConfig","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AllConfig.php","line":256,"function":"setValueMixed","class":"OC\\Config\\UserConfig","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/User/User.php","line":235,"function":"setUserValue","class":"OC\\AllConfig","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/User/Session.php","line":341,"function":"updateLastLoginTimestamp","class":"OC\\User\\User","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/CompleteLoginCommand.php","line":22,"function":"completeLogin","class":"OC\\User\\Session","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\CompleteLoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/LoggedInCheckCommand.php","line":41,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\LoggedInCheckCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/EmailLoginCommand.php","line":51,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\EmailLoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/UidLoginCommand.php","line":36,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\UidLoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/UserDisabledCheckCommand.php","line":39,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\UserDisabledCheckCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/PreLoginHookCommand.php","line":34,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/Chain.php","line":45,"function":"process","class":"OC\\Authentication\\Login\\PreLoginHookCommand","type":"->"},{"file":"/var/www/html/nextcloud/core/Controller/LoginController.php","line":344,"function":"process","class":"OC\\Authentication\\Login\\Chain","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":200,"function":"tryLogin","class":"OC\\Core\\Controller\\LoginController","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":114,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/App.php","line":161,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Route/Router.php","line":307,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/html/nextcloud/lib/base.php","line":1022,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/nextcloud/index.php","line":24,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/html/nextcloud/lib/private/DB/Exceptions/DbalException.php","Line":56,"Previous":{"Exception":"Doctrine\\DBAL\\Exception\\ReadOnlyException","Message":"An exception occurred while executing a query: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database","Code":8,"Trace":[{"file":"/var/www/html/nextcloud/3rdparty/doctrine/dbal/src/Connection.php","line":1976,"function":"convert","class":"Doctrine\\DBAL\\Driver\\API\\SQLite\\ExceptionConverter","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/doctrine/dbal/src/Connection.php","line":1918,"function":"handleDriverException","class":"Doctrine\\DBAL\\Connection","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/doctrine/dbal/src/Connection.php","line":1218,"function":"convertExceptionDuringQuery","class":"Doctrine\\DBAL\\Connection","type":"->"},{"file":"/var/www/html/nextcloud/3rdparty/doctrine/dbal/src/Connections/PrimaryReadReplicaConnection.php","line":292,"function":"executeStatement","class":"Doctrine\\DBAL\\Connection","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/DB/Connection.php","line":466,"function":"executeStatement","class":"Doctrine\\DBAL\\Connections\\PrimaryReadReplicaConnection","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/DB/ConnectionAdapter.php","line":67,"function":"executeStatement","class":"OC\\DB\\Connection","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php","line":306,"function":"executeStatement","class":"OC\\DB\\ConnectionAdapter","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Config/UserConfig.php","line":1187,"function":"executeStatement","class":"OC\\DB\\QueryBuilder\\QueryBuilder","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Config/UserConfig.php","line":843,"function":"setTypedValue","class":"OC\\Config\\UserConfig","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AllConfig.php","line":256,"function":"setValueMixed","class":"OC\\Config\\UserConfig","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/User/User.php","line":235,"function":"setUserValue","class":"OC\\AllConfig","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/User/Session.php","line":341,"function":"updateLastLoginTimestamp","class":"OC\\User\\User","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/CompleteLoginCommand.php","line":22,"function":"completeLogin","class":"OC\\User\\Session","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\CompleteLoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/LoggedInCheckCommand.php","line":41,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\LoggedInCheckCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/EmailLoginCommand.php","line":51,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\EmailLoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/UidLoginCommand.php","line":36,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\UidLoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/UserDisabledCheckCommand.php","line":39,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\UserDisabledCheckCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/PreLoginHookCommand.php","line":34,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/Chain.php","line":45,"function":"process","class":"OC\\Authentication\\Login\\PreLoginHookCommand","type":"->"},{"file":"/var/www/html/nextcloud/core/Controller/LoginController.php","line":344,"function":"process","class":"OC\\Authentication\\Login\\Chain","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":200,"function":"tryLogin","class":"OC\\Core\\Controller\\LoginController","type":"->","args":["*** 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sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":114,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/App.php","line":161,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Route/Router.php","line":307,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/html/nextcloud/lib/base.php","line":1022,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/nextcloud/index.php","line":24,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/html/nextcloud/3rdparty/doctrine/dbal/src/Driver/PDO/Exception.php","Line":24,"Previous":{"Exception":"PDOException","Message":"SQLSTATE[HY000]: General error: 8 attempt to write a readonly 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***"]},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\CompleteLoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/LoggedInCheckCommand.php","line":41,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\LoggedInCheckCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/EmailLoginCommand.php","line":51,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\EmailLoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/UidLoginCommand.php","line":36,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\UidLoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/UserDisabledCheckCommand.php","line":39,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/ALoginCommand.php","line":22,"function":"process","class":"OC\\Authentication\\Login\\UserDisabledCheckCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/PreLoginHookCommand.php","line":34,"function":"processNextOrFinishSuccessfully","class":"OC\\Authentication\\Login\\ALoginCommand","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Authentication/Login/Chain.php","line":45,"function":"process","class":"OC\\Authentication\\Login\\PreLoginHookCommand","type":"->"},{"file":"/var/www/html/nextcloud/core/Controller/LoginController.php","line":344,"function":"process","class":"OC\\Authentication\\Login\\Chain","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":200,"function":"tryLogin","class":"OC\\Core\\Controller\\LoginController","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":114,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/AppFramework/App.php","line":161,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/html/nextcloud/lib/private/Route/Router.php","line":307,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/html/nextcloud/lib/base.php","line":1022,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/nextcloud/index.php","line":24,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/html/nextcloud/3rdparty/doctrine/dbal/src/Driver/PDO/Statement.php","Line":130}}},"message":"An exception occurred while executing a query: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database","exception":{"query":"UPDATE `*PREFIX*preferences` SET `configvalue` = :dcValue1, `lazy` = :dcValue2, `type` = :dcValue3, `flags` = :dcValue4, `indexed` = :dcValue5 WHERE (`userid` = :dcValue6) AND (`appid` = :dcValue7) AND (`configkey` = :dcValue8)"},"CustomMessage":"An exception occurred while executing a query: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database"}}