I am in charge of a smaller DB 300+ hundred megs 100'ish tables about 45 users hit it throughout the work day. Mostly reads, but a fair number of updates and inserts. I have been slowing learning the structure of the DB in order to get some performance out of it. I have heard that taking a look at indexes is a good place to start. All most all of the indexes for the tables of said DB are clustered, a few of them are non-clustered.
Is there any speed advantage over clustered vs non-clustered? I have a maintenance plan (yes yes, I know) that re-orgs and rebuild the indexes nightly before diff backups, is this good enough for now, until I get a better grip on index formation and utilization?
Is/are there (a) script(s) that will help me view 'performance' of the various indexes? Just how big of can of worms did I get my self into?