Starting in March, DoubleClick Campaign Manager (DCM) will be undergoing scheduled maintenance to make important updates to our systems. Every DCM account will be assigned a single maintenance window. However, these windows may be on different days for different accounts. More information about how this will affect the DCM product can be found in our help center.

How will this affect API users?

Maintenance is expected to last up to 8 hours per account. During that time DCM Trafficking will be read-only. While in read-only mode, all API delete, insert, patch, and update methods requiring the DCM Trafficking scope will be disabled. See the Scheduled Maintenance page on our developer site to learn more about the methods that will be impacted and the errors you may encounter.

What can API users do to prepare?

If your application accesses a single DCM account, we recommend simply planning ahead to avoid running workflows that use affected API methods during your account's maintenance window. Details of when this window will occur will be communicated in advance via in-product notification.

If your application accesses multiple DCM accounts, you may be subject to multiple maintenance windows. If it's not possible to plan around these windows, you should prepare your application to catch and handle maintenance related errors. Recommended error handling strategies include:

• For user initiated requests, return an error to the user along with instructions to wait up to 8 hours before retrying the request.
• For server initiated requests, retry automatically using an exponential backoff strategy. For example: pause 30 seconds before the first retry, 1 minute before the second, 2 minutes before the third, and so on up to a maximum of 8 hours. This strategy helps ensure you're not calling the API too aggressively and that your request quota is not being wasted.

Questions about this or anything else DCM API related? Contact us via our support forum.

- Jonathon Imperiosi, DCM API Team