I have no idea what such a theory might be, though I see the "extra dimensions" people have a plan already, whereby the neutrinos take a shortcut across another dimension.
As you're designing your dimension table, you need to plan for changing dimensional data.
在设计维度表时，需要计划变更维度数据。
3
In a star join plan, the database server pushes down keys from a dimension table to filter the fact table at the same time as it builds the hash table on the dimension table.