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I am new to QGIS and am trying to dissolve polygons in my shapefile using one of the fields in the attribute in QGIS 2.8.5. The process runs, and it does add a new map but nothing seems to have changed in the new map and the polygons chosen on the basis of the field are not merged.

If this is a known problem, how can I work around it?

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    My guess is this is there are either invalid geometries or topology errors. If you use the Topology Checker in QGIS to see if you get any errors. – lolcat May 7 '17 at 4:44
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    Does it work if you try to dissolve all? – underdark May 7 '17 at 9:57
  • I tried geometry validity check and it threw no errors. I also tried changing projection to PCS from GCS as someone had suggested on a forum. Again, nothing. As for dissolve all, once it went through and nothing showed up. The other time, it just hung. Am I missing something perhaps in my installation? – R Sharada May 7 '17 at 17:05
  • What is the CRS of your data and what is the CRS of your project? – MappaGnosis May 8 '17 at 6:15
  • could you provide your shapefile? – Jochen Schwarze May 8 '17 at 11:59
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Try to run V.clean toolbox (snap, break) before running "dissolve". It worked for me

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