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Sharpshooter 007
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Previews.lrdata folder size

Apr 9, 2012 3:52 PM

I remember this being discussed a few weeks ago, but I can't find it by searching.  Anyway, my problem, if it is indeed a problem, is that the previews.lrdata folder for my LR 4.1 RC catalogs are tremendously larger than the same photos cataloged in LR 3.4.  This is on several catalogs.  I have deleted the previews.lrdata folder on catalog under both versions and regenerated the previews, but the discrepancy still exist. Any ideas as to why this is happening?

  • Currently Being Moderated
    Apr 9, 2012 6:20 PM   in reply to Sharpshooter 007

    The first thing that springs to mind is that Adobe might have tweaked the size of the auto extent growth (or some other setting that affects the size of the file allocations) in the underlying SQLite DB that creates the files in the folder you are looking at. This might have caused overall size of the DB to increase under some circumstances, especially at the beginning under sudden load.

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  • Currently Being Moderated
    Apr 10, 2012 12:24 AM   in reply to Sharpshooter 007

    Just to be clear on the process:


    If you had LR4 upgrade your LR3 catalogs, all that happens is that LR4 "steals" the previews from the LR3 catalog and renames the previews folder to match the LR4 catalog name. Thus if you were to examine the contents of the Lightroom catalog folder immediately after the upgrade you would find the original LR3 catalog but with no associated previews folder, and the LR4 catalog with an associated previews folder.....and because its a simple hi-jack of the LR3 previews folder it is of course the same size as the old LR3 folder.


    If you then open the LR3 catalog in LR3, because no previews folder now exists a new one is created and (unless you then ask LR3 to rebuild previews for all the images again) LR3 will create standard previews as you bring pictures into the grid/filmstrip. In this scenario, obviously the newly created LR3 previews folder will be far smaller than the former previews folder that is now labelled LR4.


    I have seen many posts since LR4 was released complaining about the size of the LR4 previews folder in comparison to LR3, and I just think in many cases there was a lack of understanding about the process.

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