"PostgreSQL stores each record, regardless of attributes, in an 8K block of data (excluding TOAST fields and indices) on the disk. If you have a table with 5 co

"PostgreSQL stores each record, regardless of attributes, in an 8K block of data (excluding TOAST fields and indices) on the disk. If you have a table with 5 columns of integers they will use 8K of disk space for each row, not 20 bytes." Uh, no. I think you're confusing tuples and pages. You can have many (many) tuples in a single page.