"DEFAULT cache for blocksize %s cannot be reduced to zero"
*Cause: User attempted to reduce db_cache_size to zero, or attempted to
to reduce db_K_cache_size to zero while there were still online
tablespaces with blocksize 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.