Hologres:Instances

On the Instances page, you can view all the Hologres instances that are created by using your Alibaba Cloud account and the status of these instances. You can also create instances or modify the configurations of instances. You can click the name of an instance to go to the instance details page. On the instance details page, you can perform specific operations on the objects in the instance, such as databases and users.

The Instances page provides the following features:

• Create an instance

  You can click Create Instance in the upper part of the Instances page to go to the buy page of Hologres. On the buy page, you can create a Hologres instance. For more information, see Purchase a Hologres instance.

• View instance details

  You can click the name of a Hologres instance on the Instances page to go to the instance details page. On the instance details page, you can view the instance configurations, check the monitoring and alerting data, and manage users and databases. For more information, see Instance configurations.

• Go to the HoloWeb console

  HoloWeb is an all-in-one big data development platform that is developed based on Hologres.

  HoloWeb allows you to perform data development in the Hologres console or by using SQL statements. You can click Go to HoloWeb in the left-side navigation pane of the Hologres console to go to the HoloWeb page. For more information about how to use HoloWeb, see Log on to an instance.

• Go to the DataStudio platform

  DataStudio is an all-in-one data development platform based on Hologres. This platform is deeply integrated into DataWorks.

• Search for an instance by name

  If you have multiple instances in a region, you can enter a keyword of an instance name in the search box to search for the required instance.

• View the status of an instance

  The Status column shows the status of your Hologres instances. A Hologres instance can be in one of the following states:

  • Running: The instance is running normally.

  • Creating: The payment for the instance has been made, and the instance is being created. The instance will be created within 3 to 5 minutes.

  • Processing: An operation such as upgrading, downgrading, restarting, or restoration is being performed on the instance. The operation will be complete within 2 to 5 minutes.

  • Stopped: The instance has stopped running and cannot be accessed.

  You can perform the following operations on an instance in the Status column:

  • Restart

    If you want to restart the instance, you can click Restart to restart the instance.

  • Stop

    If the billing method of the instance is pay-as-you-go, you can click Stop to stop the instance. After you click Stop, you are no longer charged for the computing resources but are still charged for the storage resources.

  • Restore

    If you want to resume the instance that is stopped, you can click Restore to resume the instance.

  • Delete

    If you no longer need the stopped instance, you can click Delete to delete the instance.

• View the billing method of an instance

  The Billing Method column shows the billing methods of your Hologres instances. For more information, see Billing overview.

• Perform operations on an instance

  You can perform the following operations in the Actions column of an instance:

  • Manage

    You can click Manage to go to the instance details page. On the instance details page, you can view and perform specific operations on the objects in the instance, such as databases and users.

  • Modify Instance Name

    To rename the instance, you can click Modify Instance Name in the Actions column. In the Modify Instance Name dialog box, enter a new instance name and click OK.

  • Switch to Subscription

    You can click Switch to Subscription to change the billing method from pay-as-you-go to subscription.

    Note

    You cannot change the billing method of a Hologres instance from subscription to pay-as-you-go. For more information, see Change the billing method.

  • Upgrade

    If the instance does not meet your business requirements, you can click Upgrade to scale out the instance. Hologres instances can be upgraded only by using an Alibaba Cloud account or as an authorized RAM user.

    Note

    During the upgrade of an instance, the instance stops providing services for a few minutes. We recommend that you upgrade instances during off-peak hours.

  • Downgrade

    If the instance contains a large amount of idle resources, you can click Downgrade to scale in the instance. Hologres instances can be downgraded only by using an Alibaba Cloud account or as an authorized RAM user.

    Note

    During the downgrade of an instance, the instance stops providing services for a few minutes. We recommend that you downgrade instances during off-peak hours.

  • Renew

    If you purchase a subscription instance, you can click Renew to renew the instance.

Hologres V1.1 and later use the multi-instance high-availability deployment mode in which storage is shared for the instances. In this deployment mode, a primary instance has full capabilities, including data reads and writes and the configuration of permissions and system parameters. Secondary instances are read-only. All operations are performed on the primary instance. For more information, see Configure read/write splitting for primary and secondary instances (shared storage).

• Limits

  • Only Hologres V1.1 and later support primary instances. If the version of your Hologres instance is earlier than V1.1, manually upgrade your Hologres instance in the Hologres console or join a Hologres DingTalk group to apply for an instance upgrade. For more information about how to manually upgrade a Hologres instance, see Instance upgrades. For more information about how to join a DingTalk group, see Obtain online support for Hologres.

  • You cannot access read-only secondary instances that are not associated with a primary instance.

  • A primary instance and its read-only secondary instances must be of the same version.

  • A primary instance and its read-only secondary instances must reside in the same region.

• Policy of associating or disassociating read-only secondary instances

  To associate read-only secondary instances with or disassociate them from a primary instance as a RAM user, you must attach the AliyunHologresFullAccess policy to the RAM user. For more information about permissions to RAM users, see Grant permissions to a RAM user.

• Associate a read-only secondary instance

  1. On the Instances page in the Hologres console, find the read-only secondary instance that you want to associate and click Associate in the Instance Type column.

  2. In the Associate with Primary Instance dialog box, select a primary instance and click Associate.

• Disassociate a read-only secondary instance

  You can disassociate a read-only secondary instance from its primary instance.

  1. On the Instances page in the Hologres console, find the read-only secondary instance that you want to disassociate and click Disassociate in the Instance Type column.

  2. In the Note message, click Disassociate.

     After the read-only secondary instance is disassociated from its primary instance, you cannot access the read-only secondary instance.