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Sitecore XP version 8.0, 8.1 and 8.2 comes with following MongoDB databases:

  • analytics
  • tracking.live
  • tracking.history
  • tracking.contact

What is the purpose of the `tracking.contact' database in MongoDB?

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Tracking Contact

The tracking.contactdatabase is used by one entity only:

  • Contact Processing Pool (defined in the Sitecore.Analytics.Processing.Aggregation.ProcessingPools.config file).

Contact Processing Pool

It works with the ProcessingPool collection that is defined in the tracking.contact database. Whenever a contact is changed (created, updated or became obsolete), a new work item with a Contact ID is added to the contact processing pool for future processing.

The Processing / Aggregation role runs the Contact Processing agent (defined in the Sitecore.Analytics.Processing.Aggregation.Services.config file). The agent uses the Contact Work Dispatcher (defined in the Sitecore.Analytics.Processing.Aggregation.Services.config file) to get work items from the contact processing pool. Each work item is processed by calling the analytics.aggregation/contacts pipeline.

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