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Cloud Instances

The Cloud Instances page allows exploring, adding, modifying, and removing the projected cloud instances of the migration project.

The Cloud Instances page contains:

  • Overview of the cloud instances.

  • The total cost of running the source instance on the cloud.

  • The configuration of the cloud instances.

Currently, TCO calculation is possible for Cloud SQL, Cloud Spanner, and AlloyDB target platforms.

The top row of the page shows three panels:

Instances by Target Platform

The number of planned cloud instances, regardless of how many sources are migrated to them

Instances by DBaaS Target Engine

The number of cloud instances by DB engine


The number of cloud instances, projected expenses (OpEx and rCapEx), and the projected cloud cost.

Projected expenses refer to the total cost of goods and services a business is expected to incur, while projected cloud cost is the cost associated with using cloud computing services, such as storage and computing power, on a subscription or pay-as-you-go basis. Projected cloud cost is based on the amount of data storage, computing power, and other resources that a business requires.

The summary panels on the Cloud Instances page

The Cloud Instance column in the Migrating tab on the Database Instances page lists the corresponding cloud instances for every database.

Below the summary panels, the Cloud SQL, Cloud Spanner, and AlloyDB tabs are shown. Use these tabs to create, remove, or edit a cloud instance of Cloud Spanner, Cloud SQL, or AlloyDB respectively.

The AlloyDB tab

Create Instances

To create an instance, click the Create button and configure the instance in the instance configuration window.

The instance configuration window

The flow for creating an instance depends on the target platform.

For information about creating Cloud SQL cloud instances, see Cloud SQL Cloud Instance.

For information about creating Cloud Spanner cloud instances, see Cloud Spanner Cloud Instance.

For information about creating AlloyDB cloud instances, see AlloyDB Cloud Instance.

Edit Instances

Editing the instance allows:

  1. Changing sources that are planned to be migrated to the cloud instance

  2. Changing the configuration of the cloud instance.

Changes to an existing instance trigger the automatic re-calculation of TCO and may impact both cost and time projections.

To modify an instance:

  1. In the Cloud SQL Cloud Spanner tab, click the instance name. The instance configuration window opens showing the current configuration of the selected cloud instance. 

  2. To add or remove sources selected for migration into the instance, in the Cloud Instance Information panel in the instance configuration window, select or clear the checkboxes of the sources.

  3. To modify instance settings for the given instance, in the Cloud Instance Information panel in the instance configuration window, change values in the fields. The Cloud Instance Information panel also allows changing the target platform.
    (info) For information about currently supported source-target pairs, see Supported Sources and Targets.

  4. Click the Confirm button to save the updates, or Cancel to discard them.

Remove Instances

To remove a single instance or multiple instances, select the check boxes of the target instances from the list, and click Remove.

Then, in the pop-up window, click Confirm to complete removal.

When a cloud instance is removed, all sources set to migrate into that instance are removed from the migration plan and calculations. Those sources will revert to the Unassigned state on the Database Inventory page and become available again for selection to any projected pathway.

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