How-to: Oracle Datatypes Data types for Oracle 8 to Oracle 12c. Variable length character string having maximum length size bytes. You must specify size. n.b. max is only 32,767 bytes or characters if MAX_STRING_SIZE = EXTENDED Datatype Description Max Size: Oracle 8 Max Size: Oracle 9i/10g/11g Max Size: Oracle12c Max Size: PL/SQL PL/SQL Subtypes/ Synonyms