Bug report #9519

Rollback operations slow if lots of features changed

Added by Matthias Kuhn almost 9 years ago. Updated almost 9 years ago.

Affected QGIS version:master Regression?:No
Operating System: Easy fix?:No
Pull Request or Patch supplied:No Resolution:duplicate
Crashes QGIS or corrupts data:No Copied to github as #:18109


To reproduce:

  • Open a layer with a big amount of features (...and with a slow backend)
  • Start editing
  • Open the field calculator
  • Create a new column (e.g. "rand( 1, 10 )" )
  • Stop editing without saving changes

It takes a long time to undo this command and QGIS freezes during this time. As far as I can tell, there are feature requests made for every single feature which was updated before (so all in the case mentioned above).
I could imagine a possible approach would be to batch undo the affected rows and perform a single request with setFilterFids() to still only request the required rows, but with less roundtrips.

Related issues

Related to QGIS Application - Bug report #9315: Field Calculator, slow performance with 2.1.0-104 Closed 2014-01-09
Duplicates QGIS Application - Bug report #9509: Discarding edits freezes qgis for a long time Closed 2014-02-07


#1 Updated by Jürgen Fischer almost 9 years ago

duplicate of #9509?

#2 Updated by Matthias Kuhn almost 9 years ago

  • Resolution set to duplicate
  • Status changed from Open to Closed

I think so. Closing as duplicate.

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