Metadata partition mapping does not require any additional tables in the warehouse. Metadata partition mapping is generally recommended over warehouse partition mapping in MicroStrategy. However, if you already have warehouse partition tables set up and are migrating to a newer version of MicroStrategy, you can continue to use the warehouse partitions. If you are creating partitions for the first time, however, it is recommended you implement metadata partition mapping.
Metadata partition mapping is recommended because you create the rules in MicroStrategy that the Query Engine uses to generate the SQL to run reports. Because you create the partitions directly in the metadata, it is easier to maintain.
Metadata partition mapping also allows both heterogeneous and homogenous partitions, unlike warehouse partition mapping. With heterogeneous partitions, the PBTs can have different amounts of data stored in them at different levels. Only homogenous partitions can be used in warehouse partition mapping. For steps to map partitions, refer to the MicroStrategy Developer Help (formerly the MicroStrategy Desktop Help).