Support multiple database for Appwrite

[nguyenthanhtien]

I want ask can support another database for Appwrite, can support another database type?
MariaDB imposes a row-size limit of 65,535 bytes for the combined sizes of all columns. If the table contains BLOB or TEXT columns, these only count for 9 - 12 bytes in this calculation, given that their content is stored separately.

[wellkilo]

For self-hosted Appwrite, the current installer/runtime supports three database adapters: PostgreSQL, MariaDB, and MongoDB. Select one with _APP_DB_ADAPTER during installation/deployment; it is not an arbitrary database-driver plug-in point.

Example environment setting:

_APP_DB_ADAPTER=postgresql

and configure the corresponding _APP_DB_HOST, _APP_DB_PORT, _APP_DB_USER, _APP_DB_PASS, and _APP_DB_SCHEMA values for that database service. The current installer validates the adapter against exactly postgresql, mariadb, or mongodb (runtime validation); the environment definition exposes the same choices (config).

Important boundaries:

• This is a self-hosted deployment choice, not something you switch for Appwrite Cloud.
• Do not point a running installation at a different empty database and expect data to migrate. Changing adapters requires an Appwrite-supported migration/export-import plan and backups.
• VectorsDB has a separate adapter and currently requires PostgreSQL; it is not controlled solely by the primary _APP_DB_ADAPTER.
• Supporting a fourth engine requires an Appwrite/Utopia database adapter plus capability and migration work; a compatible SQL dialect alone is not sufficient.

If PostgreSQL/MongoDB/MariaDB covers the database type you meant, please mark this as accepted; otherwise name the desired engine and the constraint it solves so compatibility can be evaluated concretely.