Tuning the Database - Expert Oracle RAC Performance Diagnostics and Tuning - page 310

Data refresh/populate into the in-memory area can be monitored using the session level data from either the
V$SESSION view or the V$SESSTAT view. The following query can be used to list the current stats for the in-memory
load operation listed above. AWR also lists in-memory related statistics illustrated in Figure 9-7 .
Figure 9-7. AWR report with in-memory stats