I always get extra nervous whenever adjusting DNS settings. Not only is there typically no way to preview changes, but you're always warned that "DNS propagation may take 24-48 hours." Thus, you could unintentionally cause a critical-path bug that can't even be rectified immediately.
I started this #explainlikeimfive question a little while back on the specific topic of TTL:
It honestly not that bad. I'm yet to see any operation that going to take 24-48 hours. Even delegation to a set of different servers rarely takes longer than an hour.
I always get extra nervous whenever adjusting DNS settings. Not only is there typically no way to preview changes, but you're always warned that "DNS propagation may take 24-48 hours." Thus, you could unintentionally cause a critical-path bug that can't even be rectified immediately.
I started this #explainlikeimfive question a little while back on the specific topic of TTL:
Explain DNS TTL Like I'm five
Peter Kim Frank ・ Dec 18 '17 ・ 1 min read
It honestly not that bad. I'm yet to see any operation that going to take 24-48 hours. Even delegation to a set of different servers rarely takes longer than an hour.
How often do you adjust DNS settings that MAY cause critical bugs?