A view-selection process (as described in the example scenario) is based on values loaded since the last aggregation. However, for databases that contain views from previous aggregations, on this page, the wizard provides options that enable you to decide whether previously selected views are included:
Replace existing aggregate view—To not include previously selected views, unless they are re-selected (based on their current merit)
Add to existing view selection—To include previously selected views and, thus, to enable retention of view selections that produced satisfactory query performance and to reduce materialization time.
For information about guidelines for replacing aggregations, see the Oracle Essbase Database Administrator's Guide.