Question

The level of granularity you choose for the time dimension has no significant impact on the size of your database.Whether it is true or false? and How do you explain that

Answer 1

False.

The level of granularity for the time dimension has a significant impact on the size of data base.  The finer the granularity is , the more observations and data points one has to collect and record.  So obviously the size of database to store larger number of data items will be more.