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FAQs

Last Updated: May 29, 2020

How do I select a TSDB instance type?

You can select a TSDB instance type based on the following two factors:

  • The number of timelines: indicates the number of data collection points. For example, a data collection point can be a sensor of a device that sends data. You can use the following formula to calculate the number of timelines: Number of timelines = Total number of devices × Number of data collection points or sensors of a single device.

  • Write efficiency: indicates the average number of data points that are written to TSDB per second. The data points are also known as data records. You can use the following formula to calculate the write efficiency: Write efficiency = Number of timelines × Average number of data points that are written to TSDB per second for a single timeline.

Can I access the TSDB service from the Internet?

Yes, you can access the TSDB service from the Internet. Before you access the TSDB service from the Internet, you must create an instance that is connected to a virtual private cloud (VPC). For more information, see Create an instance. Then, enable the Internet connection feature in the TSDB console. For more information, see the “Access through public networks” section in Network connection.

How does TSDB visualize data?

Currently, TSDB visualizes data by using the following methods:

What can I do if a time-out exception occurs when I access a TSDB instance and the error message “Connection timed out” appears?

By default, a TSDB instance is connected to a VPC. A time-out exception occurs in the following scenario: You use a machine to access a TSDB instance, and the machine resides in a VPC that is different from the VPC connected to the instance. To resolve this issue, you can use the following solution:

  • If the TSDB instance and the machine reside in the same region, connect the machine to the gateway of the VPC where the TSDB instance resides. For more information, see Migrate an ECS instance.

What can I do if the error message “Exceed Max TS counter xxxx” appears?

This message indicates that the total number of timelines of the TSDB instance has reached the upper limit for the current instance type. For more information about instance types, see . To resolve this issue, you must upgrade the instance type or delete certain timelines. For more information, see Delete timelines.