doc-exports/docs/gaussdb_mysql/umn/gaussdb_03_0092.html

Changing a DB Instance Class

Scenarios

You can change the CPU or memory (instance class) of a DB instance as required. If the status of a DB instance changes from Changing instance class to Available, the change is successful.

• A DB instance cannot be deleted while its instance class is being changed.
• The instance class can be changed only at the DB instance level. The instance class of the primary node or read replicas cannot be changed separately for a GaussDB(for MySQL) DB instance.

• Changing the DB instance class will cause the instance to reboot. To prevent service interruptions, change the instance class during off-peak hours.
• To prevent traffic congestion during peak hours, you are advised to reboot the DB instance during off-peak hours.

Procedure

1. Log in to the management console.
2. Click in the upper left corner and select a region and a project.
3. Click Service List. Under Database, click GaussDB.
4. You can change the instance class in either of the following ways:
   • On the Instance Management page, locate the target DB instance and choose More > Change Instance Class in the Operation column.
   • Click the target DB instance to go to the Basic Information page. In the DB Instance Information area, click Change in the Instance Class field.

5. On the displayed page, specify the new instance class and scheduled time, and click Next.

   Choose either of the following scheduled time:

   • Upon submission: The instance class will be changed upon the task submission.
   • In maintenance window: The instance class will be changed in your specified maintenance window.

6. On the displayed page, confirm the instance class.
   • If you need to modify your settings, click Previous to go back to the page where you specify details.
   • If you do not need to modify your settings, click Submit.

7. View the DB instance class change result.

   Changing the instance class takes 5–15 minutes. During this period, the status of the DB instance on the Instance Management page is Changing instance class. After a few minutes, click the instance and view the instance class on the displayed Basic Information page to check that the change is successful.

   

   After the DB instance class is 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, threadpool_size and query_cache_size.

Parent topic: DB Instance Management