ORA-00383: DEFAULT cache for blocksize string cannot be reduced to zero

admin

ORA-00383: DEFAULT cache for blocksize string  cannot be reduced to zero
Cause:  User attempted to reduce db_cache_size to zero, or attempted to to reduce
db_<n>K_cache_size to zero while there were still online tablespaces with
blocksize <n>K. Note that since the SYSTEM tablespace cannot be taken offline, it
is always illegal to set db_cache_size to zero.
Action:   Offline any tablespaces with the corresponding blocksize and then
perform the operation again.