I am doing an analysis of a road network. The attribute table holds information on the road name, type (e.g. A road, motorway etc). I would like to group all the minor roads as a single field. I have tried the dissolve function in QGIS, selecting all the minor roads and dissolving the selection. This process has been running for over 3 hours and is only on 7%! Forums suggest other people have found this tool incredibly slow.
I ran the Line dissolve from the processing toolbox which took about a minute top and saved the local roads as a new layer. I'm hoping I can overlay this somehow onto the original layer as a work around to the dissolve function not working properly. I believe the function I would need in ArcGIS would be 'Update' but I can't find a similar tool in QGIS.