Help Center/ TaurusDB/ User Guide/ Instance Management/ Configuration Changes/ Changing the vCPUs and Memory of a DB Instance or Node
Updated on 2024-12-30 GMT+08:00
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Changing the vCPUs and Memory of a DB Instance or Node

Scenarios

You can change the the specifications (vCPUs and memory) of a yearly/monthly or pay-per-use DB instance or node as needed. If the status of a DB instance or node changes from Changing instance specifications to Available, the change is successful.

You can scale up or down the specifications of your DB instance or node.

Constraints

  • A DB instance or node cannot be deleted when its specifications are being changed.
  • You can change the specifications of a DB instance or just a single node within the instance. To change the specifications of a single node, submit an application by choosing Service Tickets > Create Service Ticket in the upper right corner of the management console.
  • Instance specifications can only be changed from the general-purpose edition to the dedicated edition.
  • You can change the specifications of yearly/monthly or pay-per-use DB instances immediately or during a maintenance window. Serverless DB instances do not support specification changes.
  • If you want to change instance specifications during a maintenance window, you can cancel the task before it starts. Once started, the task cannot be canceled.
  • During an instance specification change, a read replica will be promoted to primary. To prevent service interruptions, perform the operation during off-peak hours.
  • The time required for modifying specifications depends on factors such as the number of nodes, database load, and number of database tables.
  • Changing instance specifications will change the private IP addresses for read of the primary node and read replicas. The connection addresses in your application need to be changed to prevent your services from being affected. You are advised to use the private IP address of a DB instance to connect your application.
  • The specifications of the primary node and read replicas can be changed separately. When the specifications of the primary node are changed separately, the specifications of synchronous nodes are also changed.

Changing the Specifications of a DB Instance

  1. Log in to the management console.
  2. Click in the upper left corner and select a region and project.
  3. Click in the upper left corner of the page and choose Databases > TaurusDB.
  4. On the Instances page, locate the DB instance whose specifications you want to change and choose More > Change Instance Specifications in the Operation column.

    You can also enter the page for changing instance specifications in either of the following ways:

    • Click the instance name to go to the Basic Information page. Click Expand. In the Configuration area, click Change under Instance Specifications.
      Figure 1 Changing specifications in the Configuration area
    • Click the instance name to go to the Basic Information page. In the upper right corner of the page, click and choose Change Instance Specifications.
      Figure 2 Changing specifications on the Basic Information page

  5. On the displayed page, select the desired specifications. You can scale up or down the specifications as required.

    You can change the specifications immediately or during the maintenance window.

    • Upon submission: The specifications will be changed immediately after the task is submitted.
    • In maintenance window: The specifications will be changed during the maintenance window you specify.

  6. Click Next. On the displayed page, confirm the specifications.

    • If you need to modify your settings, click Previous to go back to the page where you specify details.
    • For pay-per-use instances, click Submit.

      To view the cost incurred by the instance specifications change, choose Billing Center > Billing Dashboard in the upper right corner.

    • For yearly/monthly instances:
      • Scaling down the specifications: click Submit.

        The refund is automatically returned to your account. You can click Billing Center in the upper right corner and then choose Orders > My Orders in the navigation pane on the left to view the details.

      • Scaling up the specifications: click Submit. The scaling starts only after the payment is successful.

  7. View the results.

    Changing the instance specifications takes 5–15 minutes. During this period, the status of the instance on the Instances page is Changing instance specifications. After a few minutes, you can click the instance name to view the new instance specifications on the displayed Basic Information page.

    • After the instance specifications of TaurusDB 8.0 are changed, the system will change the values of the following parameters accordingly: innodb_buffer_pool_size, innodb_log_buffer_size, max_connections, innodb_buffer_pool_instances, innodb_page_cleaners, innodb_parallel_read_threads, innodb_read_io_threads, innodb_write_io_threads, and threadpool_size.
    • The default value of innodb_parallel_select_count is OFF for instance with 16 vCPUs or less and ON for instances with more than 16 vCPUs.

      If you have modified value of the parameter, the parameter value remains unchanged after the specifications are changed, or the default value is used.

Changing the Specifications of the Primary Node

  1. On the Instances page, click the instance name to go to the Basic Information page.
  2. In the node list, locate the primary node and click Change Instance Specifications in the Operation column.
  3. On the displayed page, select the desired specifications. You can scale up or down the specifications as required.

    You can change the specifications immediately or during the maintenance window.

    • Upon submission: The specifications will be changed immediately after the task is submitted.
    • In maintenance window: The specifications will be changed during the maintenance window you specify.

  4. Click Next. On the displayed page, confirm the specifications.

    • If you need to modify your settings, click Previous to go back to the page where you specify details.
    • For pay-per-use instances, click Submit.

      To view the cost incurred by the instance specifications change, choose Billing Center > Billing Dashboard in the upper right corner.

    • For yearly/monthly instances:
      • Scaling down the specifications: click Submit.

        The refund is automatically returned to your account. You can click Billing Center in the upper right corner and then choose Orders > My Orders in the navigation pane on the left to view the details.

      • Scaling up the specifications: click Submit. The scaling starts only after the payment is successful.

  5. View the results.

    Check that the status of the primary node is Changing instance specifications. After a few minutes, view the node specifications on the Basic Information page to check that the change is successful. This process takes 5 to 15 minutes.

Changing the Specifications of a Read Replica

  1. On the Instances page, click the instance name to go to the Basic Information page.
  2. In the node list, locate a read replica and click Change Instance Specifications in the Operation column.
  3. On the displayed page, select the desired specifications. You can scale up or down the specifications as required.

    You can change the specifications immediately or during the maintenance window.

    • Upon submission: The specifications will be changed immediately after the task is submitted.
    • In maintenance window: The specifications will be changed during the maintenance window you specify.

  4. Click Next. On the displayed page, confirm the specifications.

    • If you need to modify your settings, click Previous to go back to the page where you specify details.
    • For pay-per-use instances, click Submit.

      To view the cost incurred by the instance specifications change, choose Billing Center > Billing Dashboard in the upper right corner.

    • For yearly/monthly instances:
      • Scaling down the specifications: click Submit.

        The refund is automatically returned to your account. You can click Billing Center in the upper right corner and then choose Orders > My Orders in the navigation pane on the left to view the details.

      • Scaling up the specifications: click Submit. The scaling starts only after the payment is successful.

  5. View the results.

    Check that the node status is Changing instance specifications. After a few minutes, view the node specifications on the Basic Information page to check that the change is successful. This process takes 5 to 15 minutes.

APIs

Parent topic: Configuration Changes