Aggregate functions like Count, max, min, avg performance really depends on how did you tune your database for that kind of workload. Let us discuss this.

0:00 Intro

1:22 SELECT COUNT(*)

4:30 SELECT AVG(A)

5:15 SELECT MAX(A)

8:00 Best case scenario

11:30 Clustering

14:00 Clustering Sequential Writes

17:19 Clustering Random Writes

20:30 Summary