Subject Adding indexes on live datasets
Author rodbracher

Do you think it is bad adding an index to a relation on a live
dataset? There is a fairly good chance that relation will be being
queried / posted to at the same time. This is a single field, not part
of the PK index.

I would always avoid metadata updates such as field changes etc. but
here I must way the cost of bringing the system down for an operation
that may be safe live.