Debrief
The Teach-Back Method

Make your
understanding
visible.

Explain something you think you understand. Debrief finds the exact point it breaks, then helps you fix it.

Start a SessionHow it works
understanding.map

Database indexes

  • What an index issolid
  • Why lookups get fasterneeds attention
  • The write-time costnot reached
session_042.log

Explain how a database index makes a lookup faster.

> It keeps a sorted copy of the column, so the database can jump straight to the row instead of scanning every…