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After about 10 hours of dissolving, QGIS gives me this message :-( enter image description here

Any ideas, what this means and maybe how to correct?

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    Can you do as the error says and show us the logs? you can find the python log when you press the 'messages' button on the bottom right. – HDunn Oct 23 '16 at 15:33
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    I suspect it drained your system — I'd try in smaller batches. – lynxlynxlynx Oct 23 '16 at 16:09
  • @HDunn: thanks for the hint - maybe next weekend I have the time for another try and then I will look into the log – Kurt Oct 23 '16 at 19:55
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    Which QGIS version are you using? – ndawson Oct 23 '16 at 23:55
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    @Joseph: thanks for the tip: CREATE TABLE mergedlayer AS SELECT ST_Union(geom) FROM burgenlandzsp; did the dissolve in 10 seconds !! btw there are 382 polygons in the burgenlandzsp layer – Kurt Oct 25 '16 at 14:50
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For bigger files it is better to import them into Postgres/Postgis and let PostGIS do the heay lifting, as Joseph suggested:

CREATE TABLE mergedlayer 
AS SELECT ST_Union(geom) 
FROM burgenlandzsp; 

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