Instances

On the Instances page in the Hologres console, you can view and manage all Hologres instances under your account. You can also click an instance name to open its details page, where you can manage objects such as databases and users. The Instances page displays information for all created instances, including columns for Instance ID/Name, Status, Tags, Creation time, Instance specification, and billing method. At the top of the page, you can click the Create instance button to create an instance. For running instances, you can perform operations such as Restart, Stop, Manage, and Upgrade. For stopped instances, you can perform operations such as Restore, Delete, and Modify instance. The navigation pane on the left includes entries such as Overview, Instances, Go to HoloWeb, and Go to DataStudio.

The Instances page provides the following features:

• Create Instance

  Click Create Instance at the top of the Instances page to open the purchase page and create an instance. For more information, see Purchase a Hologres instance.

• View instance details

  Click an instance's name on the Instances page to open its details page. There, you can view configurations, monitoring, and alert information, and manage users and databases. For more information, see Instance details.

• Go to HoloWeb

  HoloWeb is an all-in-one big data development platform based on the Hologres engine.

  HoloWeb supports data development by using a visual interface and SQL statements. You can click Go to HoloWeb to open the development interface. For more information about how to use HoloWeb, see Log on to an instance.

• Go to DataStudio

  DataStudio is an all-in-one development platform that is based on the Hologres engine and deeply integrated with DataWorks.

  DataStudio supports data development by using a visual interface and SQL statements. You can click Go to DataStudio to open the development interface. Before you develop data in DataStudio, you must associate your instance with a DataWorks workspace. For more information, see Associate a Hologres instance.

  Note

  To provide a consistent development experience, HoloStudio is integrated into DataStudio. For more information, see DataWorks HoloStudio end-of-service announcement.

• Enter an instance name.

  If you have many instances, use the search box at the top of the Instances page to find a specific instance by its name.

• Status

  The Status column shows the current status of each Hologres instance. Possible statuses include:

  • Running: The instance is running normally.

  • Creating: The instance is being created after it is purchased. The creation process requires 3 to 5 minutes.

  • Handling: The instance is undergoing an operation, such as an upgrade, a downgrade, a restart, or a restoration. The operation requires 2 to 5 minutes.

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

  You can perform the following operations on an instance in the instance list based on its status:

  • Restart

    To restart an instance, click Restart.

  • Stop

    If your instance is a Pay-as-you-go instance, you can click Stop to suspend the instance. After you click Stop, you are no longer charged for compute resources, but you are still charged for storage.

  • Restore

    To resume a stopped instance, click Restore.

  • Delete

    To delete a stopped instance you no longer need, click Delete.

• Billing Method

  The Billing Method column displays the billing method of the instance. Hologres supports the Subscription and Pay-as-you-go billing methods. For more information, see Billing overview.

  In the Billing Method column, you can click Switch to Subscription to change the billing method of a Pay-as-you-go instance to subscription.

  Note

  Hologres does not support changing the billing method from subscription to Pay-as-you-go. For more information, see Change the billing method of an instance.

• Actions

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

  • Manage

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

  • Modify Instance Name

    You can click Modify Instance Name to open the Modify Instance Name dialog box. In the dialog box, enter a new name for the instance and click OK to rename the instance.

  • Upgrade

    If the current instance specifications cannot meet your business requirements, you can click Upgrade to scale up the instance. Only the purchasing Alibaba Cloud account or an authorized RAM user can upgrade the instance.

    Note

    During the upgrade, the instance is unavailable for a few minutes. We recommend performing the upgrade during off-peak hours.

  • Downgrade

    If the current instance has a large number of idle resources, you can click Downgrade to scale down the instance. Only the purchasing Alibaba Cloud account or an authorized RAM user can downgrade the instance.

    Note

    During the downgrade, the instance is unavailable for a few minutes. We recommend performing the downgrade during off-peak hours.

  • Renew

    If you purchased a subscription instance, you can click Renew to extend the service period of the instance.

Hologres V1.1 and later supports a multi-instance deployment model that uses shared storage. In this model, the primary instance provides full capabilities, such as reading and writing data and configuring permissions and system parameters. Read replicas are read-only, and all changes must be made on the primary instance. For more information about the product and its architecture, see Deploy read/write splitting with a primary instance and read replicas (shared storage).

• Limits

  • Only Hologres V1.1 and later can be used as primary instances. If your instance is earlier than V1.1, you must upgrade it. For assistance, see Troubleshoot common upgrade preparation failures or join the Hologres DingTalk group (for more information, see How do I get more online support?).

  • You cannot connect to a read replica before it is associated with a primary instance.

  • The primary instance and its read replicas must run the same version.

  • The primary instance and its read replicas must be in the same region.

• Permissions for associating and disassociating

  To associate or disassociate a read replica, you must grant the RAM user the AliyunHologresFullAccess policy. For more information about RAM roles and permissions, see Grant permissions to a RAM user.

• Associate a read replica

  1. On the Instances page, find the read replica you want to associate and click Associate in its Instance Type column.

  2. In the Associate with Primary Instance dialog box, select the primary instance with which you want to associate the read replica and click Associate to complete the association.

• Disassociate a read replica

  You can disassociate a read replica that is already associated with a primary instance.

  1. On the Instances page, find the read replica that you want to disassociate and click Disassociate in its Instance Type column.

  2. In the Note dialog box, click Disassociate to complete the disassociation.

     After the read replica is disassociated, you cannot connect to it.