DBA's don't design the database, thats the job of the developers

In our company DBA tasks are mostly create database, disaster recovery, space management and database migrations / security
We do the design .. But I hate people who don't have a concept of well tuned query.. I'd like to hit them in the head with an oracle guide but apparently that's illegal

So as a golden rule: At least make an explain plan of your query then run if it is any good.. If not, PLEASE STEP AWAY FROM YOUR PC