At the moment I make the selection using the Select by expression tool. I then choose one of the Gem2017 values (each object is an address, and has one of 388 unique Gem217 values). I want to select all objects bwith one unique Gem2017 value. Making the selection is no problem, I can make any selection I want. Making the selection usually takes less then a minute. The problem is in copying specific selections to the clipboard or saving a selection as a new file. Copying a selection of about 20.000 objects from the 7,5 mln takes about a second. Unless the issue arises, then the copy process takes forever
I have no experience with Postgis or using databases. I tried saving the csv file as a sqlite, but then had no idea how to re-open that file. The dialogbox got me all confused ☹ -----Oorspronkelijk bericht----- Van: Richard Duivenvoorde [mailto:[email protected]] Verzonden: woensdag 10 januari 2018 10:21 Aan: Jeroen Hovens <[email protected]>; 'Ramon Andinach' <[email protected]>; 'qgis-user' <[email protected]> Onderwerp: Re: [Qgis-user] ctrl-c selection issue Hi Jeroen, Loading a csv in QGIS is not optimal. I think csv does not have an index, so when you create a small selection, QGIS has to run over all those 7,5 mln object every time. Not sure how you do your 'selecting'? Is it spatial or based on zip/postcode/buurtnr/wijknr? I think I would either load it in Postgis (if available) or save as GeoPackage (better use QGIS 2.99 for that) or if all fails, create a shapefile for it. AND then create indexes on desired columns. IF you are searching for strings like zipcodes in that list, I think tools like grep (available in OSGeo4W too!) work best: Eg searching fro 3 zip codes is milliseconds work: grep '2022ZJ\|2211ZE\|1016XX' pc6hnr20170801_gwb.csv If all fails, give me a call. Regards, Richard Duivenvoorde On 10-01-18 00:33, Jeroen Hovens wrote: > Hmm, I can’t use Edit > Paste As, because qgis does not finish the > Edit >> Copy command. > > > > The csv file is about 270 MB, 7,5 mln objects with 5 attributes, no > x-y data. > > If you want to recreate the issue, the file can be found here: > > https://www.cbs.nl/nl-nl/maatwerk/2017/38/buurt-wijk-en-gemeente-2017- > voor-postcode-huisnummer > > I run into this issue when selecting all objects with Attribute Gem217 > = 310 > > 355 also has this issue. 321 and 356 work without a problem. > > > > I am using qgis here just as a means to chop the csv file into smaller > selections which I can then use to edit, add attributes and data to > and make maps of them. > > > > Gr. > > Jeroen > > > > *Van:* Qgis-user [mailto:[email protected]] *Namens > *Ramon Andinach > *Verzonden:* dinsdag 9 januari 2018 23:35 > *Aan:* qgis-user <[email protected]> > *Onderwerp:* Re: [Qgis-user] ctrl-c selection issue > > > > Just so we’ve got just about everything covered, does this happen for > “Edit-> Paste As”? > > > > Also looking at the size of your original CSV, I’d go along with > Jeroen, and try and import that csv into some other format first. > > If you can find a way of making the selection without going near the > attribute table that will help too. > > > > > > Regards, > > Ramon. > > On 10 Jan 2018, at 06:26, Jeroen Hovens <[email protected] > <mailto:[email protected]>> wrote: > > > > Thanks for the ideas. > > > > The option to save the selection as new csv file as Ramon suggested, > doesn’t work; qgis goes into ‘not responding’ and no csv file is > added to the layer list. However, a csv file is made, lacking a > decent number of objects (first test 15095 of 18582 objects and > second test is 15179 of 18582 objects, so missing about 3,5k > objects). This csv file can be opened manually in qgis. > > And I checked: this options does work for selections where the > ctrl-c option also worked. Then the new cvs layer is added to the > layer list in no time. > > > > Is there some sort of log file in qgis that might give clues to the > ‘not responding? > > > > @Kirk > > I did close and reopen qgis multiple times, even shut down the pc > entirely, but to no effect. Selections that did allow for copying > earlier, still work: I can make that selection again and ctrl-c > works fine. Seems to me this rules out memory-issues. > > > > Gr. > > Jeroen > > > > > > *Van:* Qgis-user > [mailto:[email protected]] *Namens *Kirk Schmidt > *Verzonden:* dinsdag 9 januari 2018 22:20 > *Aan:* [email protected] <mailto:[email protected]> > *Onderwerp:* Re: [Qgis-user] ctrl-c selection issue > > > > After a few selections, you may have to close and reopen qgis to > purge the memory as well. Importing a csv is memory intensive so > another approach is to try saving as a spatial database (SQLite) or > even a shapefile. Once written, you can load the spatial file and > you should have lots of memory to keep selecting points. > > > > Kirk > > On 1/9/2018 4:58 PM, Ramon Andinach wrote: > > I’m not sure what the problem is, but if I were doing that > repeatedly, I’d probably use Layer -> Save As, tick the Save > Only Selected Features box and save it to CSV. Then muck about > with excel later. > > > > This way ought to be a bit lighter on the memory. > > > > > > Ramon. > > On 10 Jan 2018, at 04:25, Jeroen Hovens <[email protected] > <mailto:[email protected]>> wrote: > > > > Hi, > > > > Using qgis 2.14.18 I have been working today with a large > csv file (7.5 mln objects). I just need selections of this > database which I can then modify in excel. So I opened the > attribute table and made a selection based on a specific > value for an attribute, and copied that selection (about > 30.000 objects) via the clipboard (ctrl-c) to a new > Microsoft Excel file, then saved the excel file and repeated > the process for another selection. This worked perfect for > some time. However, some selections won’t copy: when I press > the copy button the programs turn to ‘not responding’ and > won’t snap out of it anymore. Selection size when this > happens is about the same (about 20k to 35k objects). > > > > What could be the problem? Could the data be corrupted? How > can I check what is wrong? > > > > Thank you > > Gr. > > Jeroen > > > > _______________________________________________ > Qgis-user mailing list > [email protected] <mailto:[email protected]> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: > https://lists.osgeo.org/mailman/listinfo/qgis-user > > > > > > > > _______________________________________________ > > Qgis-user mailing list > > [email protected] <mailto:[email protected]> > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > > Unsubscribe: > https://lists.osgeo.org/mailman/listinfo/qgis-user > > > > > -- > > Kirk Schmidt, MScF, BScF, RPF > > General Manager > > Nortek Resource Solutions Inc. > > RR # 1 > > Thorburn, NS > > B0K 1W0 > > Tel (902) 922.3607 > > Email: [email protected] <mailto:[email protected]> > > Web: www.nortekreources.com <http://www.nortekreources.com/> > > _______________________________________________ > Qgis-user mailing list > [email protected] <mailto:[email protected]> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > > > > > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > _______________________________________________ Qgis-user mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
