On Mon, Jan 30, 2023 at 5:11 PM veem v <veema0000@xxxxxxxxx> wrote: > CREATE TABLE test1_UUID ( id bigint,source_id varchar(36) PRIMARY KEY, Name varchar(20) ); Maybe if you used a "native" 16-byte uuid, instead of its textual serialization with dashes (36 bytes + length overhead), the gap would narrow.