Using Chains & Priority

What are Chains?

Chains provide a way for you to logically group campaigns together and display them in a specific order.

Say, for example, that you have the following types of campaigns running in the same zone:

  • Paid campaigns
  • Third-party ad network campaigns
  • In-house campaigns

You want to make sure that all of your paid campaigns get the required number of impressions. That is accomplished by placing them in a higher chain than your
other campaigns. By placing your third-party and in-house campaigns in lower chains they will only take up the excess impressions. Let’s look at how the chains
should be set to make that happen.

Campaign Type Appropriate Chain Value
Paid Campaigns 1
Third-party Ad Network Campaigns 0
In-house Campaigns -1

The ad server starts at the highest chain (greatest number) and works its way down to the lowest chain. Visitors will first see the paid campaigns, then the
third-party campaigns and finally your in-house campaigns.

How does the ad server decide when to move between chains?

Good question! Your campaigns in the higher chains will normally have some types of limits set on them. They might be using even distribution, frequency capping
or some form of targeting. Those settings will all limit their impressions. Say, for example, that you set a frequency cap of 2 views per hour on all three of your
paid campaigns. After six page views those campaigns would all be “capped out” so the ad server would move down to the next chain and start showing your third-party
campaigns. Once the frequency caps have expired, the ad server will actually move back up to the higher chain and display your paid campaigns again.

What About Priority?

Most of the time you will have several paid campaigns running at the same time. By default all campaigns are given the same priority so that they will rotate
equally. What if you want one campaign to run more than the others though? Simply increase its priority to be higher than the others. There are several ways to
do this using ratios and percentages, so you can decide which is easier for you to use.

Using Ratios

Campaign Name Desired Ratio Appropriate Priority Value
Example One 1:1 1
Example Two 3:1 3
Example Three 2:1 2

Using Percentages

Campaign Name Desired Percentage Appropriate Priority Value
Example One 10% 10
Example Two 60% 60
Example Three 30% 30

The trick with using percentages is to make sure your priority values all sum up to 100. That effectively makes them equivalent to percentages. The nice thing
is that you don’t need to do any math to convert ratios to percentages if you do this!

Another important thing to remember is that each chain operates independently. That means that priority values are only ranked against priority values of campaigns
in the same chain. This allows you to virtually have multiple rotations within a single zone, so if a campaign in the highest chain was set to get 20% of the
impressions it would only get 20% of the total impressions given to that chain rather than 20% of the total impressions for the zone.

Hopefully this helps demystify chains for those of you having a hard time understanding them. They really are a powerful tool. Using them effectively with even
distribution, frequency capping and targeting is a great way to optimize your inventory usage.

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