What's mean here Fixed size of SGA??
I always thought PGA is a fixed size of SGA, but my sort_area_size=1M und Fixed size=0,75M!!
Can someone explain me?

SQL> startup force
Instance ORACLE lanc┌e.

Total System Global Area 61216796 bytes
Fixed Size 75804 bytes
Variable Size 18919424 bytes
Database Buffers 42143744 bytes
Redo Buffers 77824 bytes