I would assume that the rdbms
tag is easily assumed for just about every question on dba.stackexchange.com
.
For those questions specifically about non-relational DBMSen, the non-relational
tag can be used.
Is the rdbms
tag redundant? Should it be removed in edits and deprecated?
database
gets my vote too :)database
tag has been removed from nine questions. Hope we are all agree with keepingrdbms
tag.