Jared Westover goes on a quest:
Given modern hardware, you might hear that the default setting of 5 for the Cost Threshold for Parallelism (CTFP) is far too low. However, people are left with a decision: Should they change it or leave it alone? If I change it and the performance gets worse, I’ll be left with egg on my face. What exactly is the benefit of increasing it, especially for smaller-cost queries?
Read on to learn more about what Cost Threshold for Parallelism is, how you can set it, and a simple example of how the setting can affect you. Jared also has some links to great resources that I highly recommend you check out.