# Unsupported database features (Prisma Migrate)

Prisma Migrate uses the Prisma schema to determine what features to create in the database. However, some database features [cannot be represented in the Prisma schema](/guides/prisma-schema-v7-data-model-unsupported-database-features) , including but not limited to:

- Stored procedures
- Triggers
- Views

To add an unsupported feature to your database, you must [customize a migration](/guides/prisma-migrate-v7-workflows-customizing-migrations) to include that feature before you apply it.

:::callout{intent="note"}
Partial indexes are now supported in Prisma Schema Language via the `where` argument on `@@index`, `@@unique`, and `@unique`. See [Configuring partial indexes](/guides/prisma-schema-v7-data-model-indexes#configuring-partial-indexes-with-where) for details. You no longer need to customize migrations for partial indexes.

The Prisma schema is also able to represent [unsupported field types](/guides/prisma-schema-v7-data-model-unsupported-database-features#unsupported-field-types) and [native database functions](/guides/prisma-migrate-v7-workflows-native-database-functions).
:::

:::callout{intent="warning"}
This guide **does not apply for MongoDB**.\
Instead of `migrate dev`, [`db push`](/guides/prisma-migrate-v7-workflows-prototyping-your-schema) is used for [MongoDB](/guides/core-concepts-v7-supported-databases-mongodb).
:::

## [Customize a migration to include an unsupported feature](#customize-a-migration-to-include-an-unsupported-feature)

To customize a migration to include an unsupported feature:

- Use the `--create-only` flag to generate a new migration without applying it:

:::code-group
```title="bun"
bunx prisma migrate dev --create-only
```

```bash title="pnpm"
pnpm prisma migrate dev --create-only
```

```bash title="yarn"
yarn prisma migrate dev --create-only
```

```bash title="npm"
npx prisma migrate dev --create-only
```
:::

- Open the generated `migration.sql` file and add the unsupported feature - for example, a trigger function:

```title="migration.sql"
CREATE OR REPLACE FUNCTION notify_on_insert()

RETURNS TRIGGER AS $$

BEGIN

  PERFORM pg_notify('new_record', NEW.id::text);

  RETURN NEW;

END;

$$ LANGUAGE plpgsql;
```

- Apply the migration:

:::code-group
```title="bun"
bunx prisma migrate dev
```

```bash title="pnpm"
pnpm prisma migrate dev
```

```bash title="yarn"
yarn prisma migrate dev
```

```bash title="npm"
npx prisma migrate dev
```
:::

- Commit the modified migration to source control.

## Related pages

- [Authentication & Tools](./authentication-tools-index.md)
- [Build](./build-index.md)
- [Changelog](../changelog.md)
- [Concepts](./concepts-index.md)
- [Console commands](./console-commands-index.md)
- [Contract Authoring](./contract-authoring-index.md)
- [Core Concepts](./core-concepts-index.md)
- [Data Modeling](./data-modeling-index.md)
- [Database](./database-index.md)
- [DB commands](./db-commands-index.md)

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