When creating tags that will be trended the default for logging is onChange with a pretty small logging deadband.
The majority of floating point data points do not need to be logged as often as they are changing.
Of course, one can change that logging deadband and min/max time between samples, or set up a couple tag groups.
However, with a small number tags the default logging will be fine because the database can handle it. At what point does it become necessary to start changing these options and considering using tag groups instead of the on change method?
Also, are there any inherent benefits to using tag groups vs the on change method? I could imagine that it would take less overhead to just log tags "mindlessly" based on the tag rate instead of comparing it to the last value - but maybe not enough to make a difference.