Missing thumbnails

[Milind Joshi]

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
>>