db.x2iezn.4xlarge is an AWS RDS size with 16 vCPUs, 512 GiB memory. In US East (N. Virginia) it costs $6.072 per hour on demand ($4,432.56 per month) for Oracle Enterprise BYOL, Single-AZ; a 1-year reserved instance with no upfront costs $4.372 per hour, 28% less. It is sold in 4 regions.
Prices by region
USD per hour, Oracle Enterprise BYOL, Single-AZ. Reserved prices are no upfront, standard. Cheapest on-demand first.