Bug report #16216
OGR data provider is extemely slow on changing attribute values
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: | - | ||
| Category: | Attribute table | ||
| Affected QGIS version: | 2.18.3 | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | Yes | Resolution: | |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 24126 |
Description
OGR data provider is extemely slow on changing attribute values. The reason is simple, the method QgsOgrProvider::changeAttributeValues() doesn't use transactions. The attached sample scripts (qgis.py) shows more than 60sec elapsed time when changing attribute value for 1000 features stored in SQLite database.
execfile(u'/tmp/tmpMS2K_V.py'.encode('UTF-8'))
Time elapsed: 56.5938699245
Associated revisions
OGR data provider: use transactions when changing attributes and geometries (if possible) (fixes #16216)
OGR data provider: use transactions when changing attributes and geometries (if possible) (fixes #16216)
Cherry picked from 16a421c7a8292b4e697363e5c57634ff57025e3a
History
#1
Updated by Martin Landa almost 8 years ago
- File qgis.py
added
#2
Updated by Martin Landa almost 8 years ago
- % Done changed from 0 to 50
See https://github.com/qgis/QGIS/pull/4172
The sample script reports about 1sec when changing 1000 features in SQLite database compared to 60sec without transactions.
#3
Updated by Martin Landa almost 8 years ago
New pull request against master: https://github.com/qgis/QGIS/pull/4175
#4
Updated by Martin Landa over 7 years ago
- Status changed from Open to Closed
Fixed in changeset 16a421c7a8292b4e697363e5c57634ff57025e3a.