Hello Fu,
Certainly,when you declutter / delete the unused data, the space is saved,or it will definitely increase the memory or table space. If it is not working then
You can also use the program RSATREE_PSA_DELETE_BATCH. to delete the PSA data. then check the table space accordingly.
Please refer below document on PSA deletion by Pradeep B.
Hope this helps !
Regards
YN