I created a table with partition Range (Transaction_Date, Retention_Period) and hash (Record_Id) subpartition template (for 32 subpartitions)
Then I add more partitions and while the loop is going on I can get counts of partitions and subpartitions. The job finished and my log table shows about 1800 partitions added and there should be 32 subpartitions for each of the partitions. However, user_tab_partitions shows zero records for the table, and user_tab_subpartitions also show zero record. After a few minutes the partitions show up but no subpartitions. The indexes on the table have also disappeared (one local and one global)
I think you have more luck getting your question answered in the 'regular' database forum. Oracle database version on Exadata is not different then any other 64bits Oracle RBMS for linux installation. The point that Dan is trying to make is that forum is for Exadata specific features and questions (e.g. smartscans, infinband, cellservers etc.).