Alibaba Cloud DCDN provides resource plans that help you save costs. This topic describes how to choose and purchase resource plans.
Guidelines
We recommend that you choose resource plans based on the features and services that you want to use, business volume, and accelerated region. 
You can purchase resource plans on the buy page.
For more information about the pricing of resource plans, see DCDN pricing.
After you purchase an outbound data transfer plan, select the pay-by-data-transfer metering method. If the metering method is not pay-by-data-transfer, the plan does not take effect until you change the metering method to pay-by-data-transfer. You can switch between both metering methods as required. For more information, see Change the metering method.
We recommend that you use the purchased resource plan as soon as possible. No refunds are provided after a resource plan expires.
Examples
Scenario
Alice wants to accelerate content delivery for a small-sized community website. The following information describes the basic information about her website:
Website type: small-sized community website. Website content: images, text, and on-demand videos.
Accelerated region: Chinese mainland.
Other services: Image and video files are stored in an Object Storage Service (OSS) bucket. HTTPS secure acceleration is used to encrypt data transmission.
Resources.
Item
Expected resource consumption
Outbound data transfer
Daily peak bandwidth: about 1 Gbit/s
Outbound data transfer: 3.16 TB per day, 95 TB per month, 570 TB per six months, and 1,140 TB per year
HTTPS requests for static content
Daily maximum number of queries per second (QPS): about 3,000
Number of requests: about 78 million per day, 2.33 billion per month, and 27.96 billion per year
OSS outbound traffic
The fees for OSS outbound traffic are directly related the cache hit ratios of DCDN. The higher the cache hit ratios, the lower the fees charged by OSS.
For example, the byte hit ratio and request hit ratio of DCDN are both 90%. In this case, 10% of the network traffic and requests are redirected to the origin server, which is an OSS bucket. OSS charges fees for the data transfer generated during back-to-origin routing. For more information, see OSS Pricing.
Scenario breakdown
Determine billable items based on required features and choose resource plan types
Feature and billable item
Resource plan
Basic features: outbound data transfer
Outbound data transfer plans
Determine the quota required and subscription duration of the resource plans
Select outbound data transfer plans for DCDN based on the expected amount of data transfer of your domain name and the quota options listed on the buy page, as described in the following table.
Expected amount
Capacity
Subscription duration
Benefit and drawback
95 TB per month
50 TB
One month
This solution consumes two data transfer plans every month, which requires frequent purchases.
570 TB per six months
200 TB
Six months
This solution consumes three data transfer plans every six months. However, this solution provides better savings.
1,140 TB per year
1 PB
One year
In this example, Alice runs a small-sized community website. The website may attract more visitors and experience fluctuations in outbound data transfer. Data transfer resources may be wasted if Alice purchases a one-year outbound data transfer plan.
Recommended resource plans
Outbound data transfer plan:
Commodity type: resource plan for Alibaba Cloud DCDN
Resource plan type: outbound data transfer plan
Capacity: 200 TB
Accelerated region: Chinese mainland
Subscription duration: six months