You should investigate what kind query analysis tools your DBMS has. There should be a tool that will tell you what type of execution path your DBMS is planning for your query. Generally, these will help you determine where indexes are useful.
If you have absolutely no indexes then for every query you are doing a full table scan instead of an index scan. So, adding a n index will improve performance dramatically. Most likely by at LEAST an order of magnitude and possibly even more than that.
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