Determine where to store the migrated data
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The goal of xDB Data Migration Tool is to make data from MongoDB available in xDB. In order to store data in xDB there has to be a data structure to hold the data.
In xDB, there are several data structures available, depending on the type of data you are dealing with.
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Contacts - identifiers and facets
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Interactions - facets and events
For this example, a custom contact facet is needed.