Missing thumbnails

[Gilles Caulier]

yes, all thumbnails are stored in the database, a dedicated sqlite
file as explained here:

https://docs.digikam.org/fr/setup_application/database_settings.html#the-sqlite-database

Removing this file will be recreated from scratch at next startup, and
using the maintenance tool.

Note that a console trace can be informative to catch error from
database while generating thumbs with current one. See details here :

https://www.digikam.org/contribute/

Gilles Caulier


Le sam. 14 oct. 2023 à 08:47, Milind Joshi <mmjoshi at iitbombay.org> a écrit :
>
> Still waiting for an update on this. Desperately need a solution ASAP.
>
> On 12.10.2023 04:44:26 pm, Milind Joshi wrote:
> > Hi Gilles
> >
> > I have about 4,000 images in my collections. They consist of dng, pef,
> > arw, tif and jpg formats. These files are in different collections,
> > one for each format. The collections are on an external drive. The
> > problem affects all these collections. However, some thumbnails (about
> > 10% ) in all these collections are displayed correctly. Rest are missing.
> >
> >  It's a one TB drive with more than 500 GB free. So disk space is not
> > a problem.
> >
> > Are the thumbnails stored in thumbnails-digikam.db? Will deleting this
> > and the thumbnails-digikam.db-journal file create the thumbnails all
> > over again. Interestingly, the time stamp  on both the files is
> > yesterday indicating that all the refresh operations I have done today
> > have had no effect.
> >
> > Do update on the next course of action.
> >
> > mj
> >
> > On 12.10.2023 02:53:01 pm, Gilles Caulier wrote:
> >> Hi,
> >>
> >> Which kind of image format is affected with the thumbnails lost ?
> >>
> >> Thumbnails are stored in a dedicated sqlite database and compressed in
> >> Wavelets format (PGF). Did you have enough space on the disk where the
> >> database is stored ?
> >>
> >> How many items do you have in your collections ?
> >>
> >> Best
> >>
> >> Gilles Caulier
> >>
> >> Le jeu. 12 oct. 2023 à 10:32, Milind Joshi <mmjoshi at iitbombay.org> a
> >> écrit :
> >>> I have been using digiKam for a number of years. Being an open source
> >>> fan digiKam along with RawTherapee and Gimp are my tools to manage my
> >>> photography workflow.
> >>>
> >>> Couple of days back, I noticed thumbnails missing from some of my
> >>> collections. Rather than figuring out why it happened, I tried to
> >>> refresh the collection thinking that the thumbnails will be generated
> >>> again. digiKam progress display in the bottom right does show that the
> >>> Thumbs are being generated. However, the progress indicator stays stuck
> >>> at 0% forever. Thinking that the database could have been corrupted, I
> >>> used the Maintenance tool to clean the thumbnail database. This was
> >>> done
> >>> successfully. However, when I tried to refresh my collection to
> >>> generate
> >>> the thumbnails the same problem of the progress bar for thumbs
> >>> generation staying at 0% is repeated.
> >>>
> >>> What could be the problem? More importantly how to I recover from it.
> >>> It's impossible to manage the workflow without seeing the thumbnails.
> >>>
> >>> I am on Windows 11 and have digiKam 8.1.0 on my laptop.
> >>>
> >>> Need solution for this urgently!
> >>>
> >>> mj
> >>>