The above query is hitting us hard in Production. I'm seeing ~2s responses for this query. Our dbas have suggested that it could be replaced with the following:

SELECT owner,object_name 
FROM all_objects 
WHERE owner=:table_owner 
  AND object_name=:table_name 
  AND object_type in ('TABLE','VIEW','SYNONYM');

I don't know enough about the inner workings of Oracle to know whether this is a useful improvement and whether it would work over all the supported versions of Oracle for this Gem. Can someone with a bit more knowledge provide me with some insight here?