Different options for creating a distinct count measure in SSAS

When we create a Multidimensional Database (SSAS), sometimes we need to use the distinct count measure. For example, we need to know the number of users who buy our products. We sometimes have a customer that buys many products, but we need to know the number of unique users. For this scenario, the distinct count measure is very useful. This measure contains very useful information for our reports, but unfortunately it is an expensive resource and if we have many GB or TB of information, it can take a long time to run the queries. This article contains different options to solve the distinct count problem.