理解projectivity in database

• Overview

  From [1], projectivity is percentage of a tuple that is read.

• Projectivity

  From collins, it means the capacity for projection.

  projection:

  • countable noun: a projection is an estimate of a future amount
  • uncountable noun: The projection of a film or picture is the act of projecting it onto a screen or wall

• References

1. The Design and Implementation of Modern Column-Oriented Database System