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# MySQL

Use `MySQLStore` to persist Mastra application data, including messages, workflows, traces, scores, and other storage domains, in a MySQL database.

## Installation

Storage providers must be installed as separate packages:

**npm**:

```bash
npm install @mastra/mysql@latest
```

**pnpm**:

```bash
pnpm add @mastra/mysql@latest
```

**Yarn**:

```bash
yarn add @mastra/mysql@latest
```

**Bun**:

```bash
bun add @mastra/mysql@latest
```

## Usage

Add `MySQLStore` to your Mastra configuration with a MySQL connection string:

```typescript
import { Mastra } from '@mastra/core'
import { MySQLStore } from '@mastra/mysql'

export const mastra = new Mastra({
  storage: new MySQLStore({
    id: 'mysql-storage',
    connectionString: process.env.MYSQL_URL!,
  }),
})
```

For example, `MYSQL_URL` can use the format `mysql://user:password@host:3306/database`.

### Host-based configuration

You can provide individual connection fields instead of a connection string:

```typescript
import { Mastra } from '@mastra/core'
import { MySQLStore } from '@mastra/mysql'

export const mastra = new Mastra({
  storage: new MySQLStore({
    id: 'mysql-storage',
    host: process.env.MYSQL_HOST!,
    port: Number(process.env.MYSQL_PORT ?? 3306),
    user: process.env.MYSQL_USER!,
    password: process.env.MYSQL_PASSWORD,
    database: process.env.MYSQL_DATABASE!,
  }),
})
```

## Options

### Connection string

**connectionString** (`string`): MySQL connection string, including the database name unless database is provided separately.

**database** (`string`): Database name that overrides the database in the connection string.

**max** (`number`): Maximum number of connections in the pool. (Default: `10`)

**ssl** (`boolean | Record<string, unknown>`): Enables SSL or provides mysql2-compatible connection SSL options.

### Host-based connection

**host** (`string`): MySQL server hostname.

**port** (`number`): MySQL server port. (Default: `3306`)

**user** (`string`): MySQL user name.

**password** (`string`): Password for the MySQL user.

**database** (`string`): Database used for Mastra storage.

**ssl** (`boolean | Record<string, unknown>`): Enables SSL or provides mysql2-compatible connection SSL options.

**max** (`number`): Maximum number of connections in the pool. (Default: `10`)

**waitForConnections** (`boolean`): Waits for a connection when the pool has reached its connection limit. (Default: `true`)

**queueLimit** (`number`): Maximum number of requests the pool can queue. Use 0 for no limit. (Default: `0`)

### Storage and index options

**id** (`string`): Unique identifier for this storage instance. (Default: `mysql`)

**disableInit** (`boolean`): Disables automatic initialization. Call storage.init() manually before using the store.

**skipDefaultIndexes** (`boolean`): When true, default storage indexes aren't created during initialization.

**indexes** (`CreateIndexOptions[]`): Custom index definitions to create during initialization.

## Initialization

When you register storage with `Mastra`, `init()` is called automatically to create the [core schema](https://mastra.ai/reference/storage/overview):

```typescript
const storage = new MySQLStore({
  id: 'mysql-storage',
  connectionString: process.env.MYSQL_URL!,
})

export const mastra = new Mastra({
  storage, // init() is called automatically
})
```

When using storage directly without `Mastra`, call `init()` before accessing domain stores:

```typescript
const storage = new MySQLStore({
  id: 'mysql-storage',
  connectionString: process.env.MYSQL_URL!,
})

await storage.init()

const memoryStore = await storage.getStore('memory')
```

## Production

Use a durable MySQL database that your Mastra deployment can reach. Store credentials in environment variables, and enable SSL when your database provider requires it.