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The tutorial discusses how to pack fields in a record in the relational model. Each record has a fixed type, allowing for easier organization without the need for self-describing records. The schema for the table is stored in the system catalog, saving space by not storing type information with each record. The system catalog consists of tables, following the same representations as the records. The goal is to make the record formats compact for efficient memory and disk usage, reducing the need for excessive input/output operations.