select * from v$pgastat

NAME VALUE UNIT
aggregate PGA target parameter 74999808 bytes
aggregate PGA auto target 62383104 bytes
global memory bound 3749888 bytes
total PGA inuse 5836800 bytes
total PGA allocated 8256512 bytes
maximum PGA allocated 8256512 bytes
total freeable PGA memory 0 bytes
PGA memory freed back to OS 0 bytes
total PGA used for auto workareas 0 bytes
maximum PGA used for auto workareas 0 bytes
total PGA used for manual workareas 0 bytes
maximum PGA used for manual workareas 0 bytes
over allocation count 0 null
bytes processed 9942016 bytes
extra bytes read/written 0 bytes
cache hit percentage 100 percent