---
title: "Attach a parameter group to a DBaaS instance"
description: "Attach or detach a parameter group on a MySQL, MariaDB, or PostgreSQL DBaaS instance."
content_type: "how-to"
product: "database"
platform: "MyAccount"
url: "/myaccount/parameter-group/how-to/attach-a-parameter-group-to-a-database/"
relationships: {"requires":["/myaccount/parameter-group/how-to/create-and-edit-a-parameter-group/"]}
---

# Attach a parameter group to a DBaaS instance

Attach a parameter group to a DBaaS instance to apply the group's engine settings to it. A DBaaS
instance has one parameter group attached at a time, and the group's values apply to the primary;
Read Replicas stay as they are.

## Before you begin

- The DBaaS instance is **Running**.
- You have a parameter group for its engine and version; see
  [Create and edit a parameter group](/myaccount/parameter-group/how-to/create-and-edit-a-parameter-group/).

## Attach a parameter group

1. On the DBaaS instance's **DBaaS Details** tab, in the **Parameter Group** row, click **Attach**.
2. Choose a group made for the DBaaS instance's engine and version from **Attach Parameter Group**,
   then click **Attach**.

The group's values are applied to the primary, and the row now offers **Detach**.

## Detach a parameter group

On the DBaaS instance's **DBaaS Details** tab, in the **Parameter Group** row, click **Detach**. The
group is detached as soon as you click, and the link changes back to **Attach**.

To change the group's values later and push them to the DBaaS instance, see
[Create and edit a parameter group](/myaccount/parameter-group/how-to/create-and-edit-a-parameter-group/).