New answers tagged spatial-database
I would recommend splitting the Europe file, as opposed to trying to merge OSM files. Often the country extracts will have a slight buffer, so the Czech extract will include a bit of germany. I don't know how well various merging tools are at deduplicating that.
You can create the polygon using Buffer. Note that the distance is in the units of the coordinate reference system you're using (which is probably degrees since you said its latitude and longitude). So if you want a 10 metre buffer, you probably need to project it (or be willing to accept some inaccuracy in the buffer size if you just want to convert 10 ...
You could do some processing before with osmconvert (http://wiki.openstreetmap.org/wiki/Osmconvert) or osmosis. Basically you cut the area you're interested (clip based on bbox) in from the two extracts, then merge the two resulting files to have a single file. Then you can convert this file in spatialite, probably faster than doing on the complete file! ...
You can do this with the QGIS plugin QuickOSM. You can also grab the query from the QuickOSM-gui and use that for querying the Overpass-API (you just need to paste the XML to the editor and run the script..) which will allow you to export the search result as GeoJSON or osm-file. See the last picture with a query comprising all OSM-Data within a given ...
Actually, if I open the recent History .xml file, C:\Users\USERNAME\AppData\Roaming\ESRI\Desktop10.1\ArcToolbox\History The most recent will have parameters & env. settings & time. It gives all the geoprocessing tools used (if w/in arcpy) and all the settings and environment settings and time started and finished.
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