Hi mongodb community,
In minute 2:41, kirby create an explanaible object and exucute a query using ssn field for sorting :
Then he finds the total key examined and total doc returned in executions stats :
For me, I have to create first an index on ssn field before executing this query. Otherwise 0 key is examined .There is no indication in the video lesson to create first an index on ssn field
After creating index on ssn field :
What do you think ?