Amazon RDS for Oracle is announcing support for Extended Data Types when using custom parameter groups with the MAX_STRING_SIZE parameter set to EXTENDED. Extended Data Types let users increase the maximum size of VARCHAR2, NVARCHAR2 and RAW columns to 32767 bytes.
You can use Extended Data Types with DB instances that use Oracle 12c major versions. Please refer to the Amazon RDS User Guide for more details.
Refer to Amazon RDS Pricing for pricing and regional availability.