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chore(docs): tidy up supported DB engines for metadata store (#24080)

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docs/docs/frequently-asked-questions.mdx
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@ -186,17 +186,14 @@ table afterwards to configure the Columns tab, check the appropriate boxes and s
### What database engine can I use as a backend for Superset?
To clarify, the database backend is an OLTP database used by Superset to store its internal
information like your list of users, slices and dashboard definitions.
information like your list of users and dashboard definitions. While Superset supports a
[variety of databases as data *sources*](https://superset.apache.org/docs/databases/installing-database-drivers/),
only a few database engines are supported for use as the OLTP backend / metadata store.
Superset is tested using Mysql, Postgresql and Sqlite for its backend. It’s recommended you install
Superset on one of these database server for production.
Superset is tested using MySQL, PostgreSQL, and SQLite backends. It’s recommended you install
Superset on one of these database servers for production. Installation on other OLTP databases
may work but isn’t tested. Column-store, non-OLTP databases are not designed for this type of workload.
Using a column-store, non-OLTP databases like Vertica, Redshift or Presto as a database backend
simply won’t work as these databases are not designed for this type of workload. Installation on
Oracle, Microsoft SQL Server, or other OLTP databases may work but isn’t tested.
Please note that pretty much any databases that have a SqlAlchemy integration should work perfectly
fine as a datasource for Superset, just not as the OLTP backend.
### How can I configure OAuth authentication and authorization?