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all right now weve talked about how to pack records on a page the next question is how to pack fields in a record so in the relational model each record has a fixed type and this is going to make our job a little bit easier were going to assume that somewhere off to the side we have a schema for the table that were currently storing well put that in a place we call the system catalog and this is going to save us the trouble of storing type information with the records so each record does not have to be self describing it doesnt need to describe its own schema schema stored somewhere else in the system catalog it turns out the system catalog is just a collection of more tables and so actually the system catalog is also built using the same representations that were learning here our goals in this section for the record formats we want to make the records compact in memory and on disk so that we have efficient i/o so we dont do more IO than we need to because we keep the data sma