---
lang: en
title: 'API docs: repository.schemamigrationoptions'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/repository
permalink: /doc/en/lb4/apidocs.repository.schemamigrationoptions.html
---

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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [SchemaMigrationOptions](./repository.schemamigrationoptions.md)

## SchemaMigrationOptions interface

<b>Signature:</b>

```typescript
export interface SchemaMigrationOptions extends Options 
```
<b>Extends:</b> [Options](./repository.options.md)

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [existingSchema](./repository.schemamigrationoptions.existingschema.md) | 'drop' \| 'alter' | When set to 'drop', schema migration will drop existing tables and recreate them from scratch, removing any existing data along the way.<!-- -->When set to 'alter', schema migration will try to preserve current schema and data, and perform a non-destructive incremental update. |
|  [models](./repository.schemamigrationoptions.models.md) | string\[\] | List of model names to migrate.<!-- -->By default, all models are migrated. |