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After read this nice post from underdark A Beginner’s Guide to pgRouting, although I still have some little problems, I think I can begin the "Creating a routable road network" stage right now.

I got a polyline shapefile already, but after I Add PostGIS Layers, I open PostGIS Manager and I don't know if these two red triangles would bother me later on:

  • There is a significant difference between estimated and real row count. Consider running VACCUUM ANALYZE.
  • No spatial index defined.

If they do, what can I do?

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You should post new questions for each question. That way you will get better, focused answers. –  Devdatta Tengshe Apr 3 '13 at 8:17
    
Please post one question per thread. I'll remove the last three questions from this one. –  underdark Apr 3 '13 at 9:30
    
Thanks for reminding me. –  Heinz Apr 3 '13 at 9:56
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