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Documentation for LoopBack 4
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lang: en
title: 'API docs: repository.repositorymixindoc.migrateschema'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository.repositorymixindoc.migrateschema.html
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[Home](./index.md) > [@loopback/repository](./repository.md) > [RepositoryMixinDoc](./repository.repositorymixindoc.md) > [migrateSchema](./repository.repositorymixindoc.migrateschema.md)
## RepositoryMixinDoc.migrateSchema() method
Update or recreate the database schema for all repositories.
\*\*WARNING\*\*: By default, `migrateSchema()` will attempt to preserve data while updating the schema in your target database, but this is not guaranteed to be safe.
Please check the documentation for your specific connector(s) for a detailed breakdown of behaviors for automigrate!
<b>Signature:</b>
```typescript
migrateSchema(options?: SchemaMigrationOptions): Promise<void>;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| options | <code>SchemaMigrationOptions</code> | Migration options, e.g. whether to update tables preserving data or rebuild everything from scratch. |
<b>Returns:</b>
`Promise<void>`