Ganesh A Hegde <sgurukrupa@gmail.com> writes: > There is only a single sentence starting with 'if' and not two. The phrase > 'it is therefore ..' is preceded by a comma and not a period. Hence, > there's a single sentence and not two as you are referring to.
I concur with Magnus that the "therefore" refers to the sentences preceding this one. While we could just drop it as you suggest, maybe better is to rearrange:
Therefore, if one PostgreSQL server instance is to house projects or users that should be separate and for the most part unaware of each other, it is recommended to put them into separate databases.
I put forth a minor reworking of this page a little while back.