!--a11y-->
System Response Upon Changes to
Data 
· If the hierarchies and attributes of characteristics in an InfoCube change and aggregates exist for these characteristics, these aggregates have to be modified accordingly (see System Response Upon Changes to Data: Aggregates).
· For information about hierarchy/attribute change runs with HPA indexes, as well as about special cases in which it is worthwhile restructuring a HPA index, see System Response Upon Changes to Data: HPA Index.
· For information about further optimizing the performance of particularly frequently used HPA indexes, see Improving Efficiency with HPA Delta Indexes.