Converting database type
You can convert a SQLite database to a better performing MySQL, MariaDB or PostgreSQL database with the Nextcloud command line tool. SQLite is good for testing and simple single-user Nextcloud servers, but it does not scale for multiple-user production servers.
Run the conversion
First set up the new database, here called “new_db_name”. In Nextcloud root folder call
php occ db:convert-type [options] type username hostname database
--port="3306"the database port (optional)
--password="mysql_user_password"password for the new database. If omitted the tool will ask you (optional)
--clear-schemaclear schema (optional)
--all-appsby default, tables for enabled apps are converted, use to convert also tables of deactivated apps (optional)
-n, --no-interactiondo not ask any interactive question
Note: The converter searches for apps in your configured app folders and uses
the schema definitions in the apps to create the new table. So tables of removed
apps will not be converted even with option
php occ db:convert-type --all-apps mysql oc_mysql_user 127.0.0.1 new_db_name
To successfully proceed with the conversion, you must type
yes when prompted
with the question
Continue with the conversion?
On success the converter will automatically configure the new database in your
If you updated your Nextcloud instance, there might be remnants of old tables which are not used any more. The updater will tell you which ones these are.
The following tables will not be converted: oc_permissions ...
You can ignore these tables. Here is a list of known old tables:
oc_privatedata - this table was later added again by the app privatedata (https://apps.nextcloud.com/apps/privatedata) and is safe to be removed if that app is not enabled