Hologres:Instance list

On the Instances page, you can view all Hologres instances in your account, check their statuses, create instances, or change configurations. You can also click an instance name to go to the instance details page for more granular management of objects such as databases and users.

The following features are available on the Instances page:

• Create Instance

  Click Create Instance in the upper-right corner of the Instances page to go to the purchase page and buy an instance. For more information, see Purchase a Hologres instance.

• View instance details

  Click the name of a target instance in the Instances to open its details page. On the details page, you can view instance configurations and alert information, and manage users and databases. For more information, see Instance details.

• Go to HoloWeb

  HoloWeb is a one-stop big data development platform built on the Hologres engine.

  HoloWeb supports data development using both visualization tools and SQL. Click Go to HoloWeb to open the HoloWeb development interface. For more information, see Log on to an instance.

• Go to DataStudio

  DataStudio is a one-stop development platform built on the Hologres engine and is deeply integrated with DataWorks.

  DataStudio supports data development using both visualization tools and SQL. Click Go to DataStudio to open the development interface. Before you can use DataStudio, you must attach the instance to a DataWorks workspace. For more information, see Attach a Hologres instance.

  Note

  To provide a consistent development experience, HoloStudio will be integrated into DataStudio. For more information, see DataWorks HoloStudio offline announcement.

• Enter an instance name.

  If you have many instances in the current region, you can find a specific instance by entering a keyword from its name in the search box at the top of the Instances page.

• Status

  The Status column displays the current status of the Hologres instance. The possible statuses are as follows:

  • Running: The instance is running as expected.

  • Creating: The instance is being created after a successful purchase. This process takes 3 to 5 minutes.

  • Handling: The instance is being upgraded, downgraded, restarted, or resumed. This process takes 2 to 5 minutes.

  • Stopped: The instance is paused and cannot be accessed.

  In the instance list, you can perform the following operations on an instance:

  • Restart

    Click Restart to restart the current instance.

  • Stop

    If you have a Pay-as-you-go instance, you can click Stop to pause the instance. After you click Stop, you are no longer charged for the instance's computing resources, but you are still charged for its storage.

  • Restore

    To resume a stopped instance, click Restore.

  • Delete

    If you no longer need a stopped instance, you can delete it by clicking Delete.

• Billing Method

  The Billing Method column indicates the billing method for the instance. For more information, see Billing overview.

  In the Billing Method column, you can click Switch to Subscription to change an instance from Pay-as-you-go to subscription.

  Note

  Hologres does not currently support switching the billing method from subscription to Pay-as-you-go. For more information, see Switch between billing methods.

• Actions

  In the Actions column of the instance list, you can perform the following operations on an instance:

  • Manage

    Click Manage to go to the instance management page. On this page, you can view and manage objects such as databases and users in more detail.

  • Modify Instance Name

    Click Modify Instance Name. In the Modify Instance Name dialog box, enter a new instance name and click OK.

  • Upgrade

    If the current instance type does not meet your business requirements, you can click Upgrade to scale out the instance. Only Alibaba Cloud accounts and RAM users with the required permissions can upgrade instances.

    Note

    The service is unavailable for several minutes during an instance upgrade. We recommend that you perform the upgrade during off-peak hours to minimize the impact on your business.

  • Downgrade

    If your instance has a high number of idle resources, you can click Downgrade to scale it in. Only Alibaba Cloud accounts and RAM users with the required permissions can downgrade instances.

    Note

    The service is unavailable for several minutes during an instance downgrade. We recommend that you perform the downgrade during off-peak hours to minimize the impact on your business.

  • Renew

    If your instance uses the subscription billing method, you can click Renew to extend the subscription.

Hologres V1.1 and later supports a multi-instance deployment solution that uses shared storage. In this solution, the primary instance has full read and write capabilities, and its permissions and system parameters can be configured. Read-only instances are in a read-only state, and all changes are made through the primary instance. For more information about the product and architecture, see Deploy primary and read-only instances for read/write splitting (shared storage).

• Limits

  • Only Hologres V1.1 or later can be used as a primary instance. If your instance is earlier than V1.1, see Common errors that occur when you prepare for an upgrade or join the Hologres DingTalk group for feedback. For more information, see How do I get more online support?.

  • You cannot connect to a read-only instance before it is attached to a primary instance.

  • The primary instance and the read-only instance must be the same version.

  • The primary instance and the read-only instance must be in the same region.

• Permissions for attaching and detaching instances

  You must grant the AliyunHologresFullAccess access policy to a RAM user before the user can attach or detach read-only instances. For more information about RAM permissions, see Grant permissions to a RAM user.

• Attach a read-only instance

  1. On the Instances page of the Hologres console, find the target read-only instance and click Associate in the Instance Type column.

  2. In the Associate with Primary Instance dialog box, select the primary instance to which you want to attach the read-only instance, and then click Associate.

• Detach a read-only instance

  You can detach a read-only instance that is already attached to a primary instance.

  1. On the Instances page of the Hologres console, find the read-only instance to detach and click Disassociate in the Instance Type column.

  2. In the Note dialog box, click Disassociate to detach the read-only follower instance.

     After the read-only secondary instance is disassociated, you cannot access it.