Library corruption?

[fvdham]

Hallo,
I noticed something strange while comparing libraries.
I have a main lib with all my books and a temp one to clean-up new books. When I compare books in that lib with the main lib it sometimes does not find duplicates. When I copy the book concerned to the temp lib and do a compare books within the temp lib it finds the duplicate one. When I copy the new book from the temp lib to the main lib I get the message that the book is a duplicate! Is my main lib in some way a little bit corrupt?

Please help!

[BetterRed]

Originally Posted by fvdham

Hallo,
I noticed something strange while comparing libraries.
I have a main lib with all my books and a temp one to clean-up new books. When I compare books in that lib with the main lib it sometimes does not find duplicates. When I copy the book concerned to the temp lib and do a compare books within the temp lib it finds the duplicate one. When I copy the new book from the temp lib to the main lib I get the message that the book is a duplicate! Is my main lib in some way a little bit corrupt?

Please help!

@fvdham - To determine if a library is corrupt run Library Maintenance->Check Library - the first phase checks the database, the second checks that database and library contents (folders & files) are coherent - i.e. there is nothing in one that's not in the other and vice versa.

How do you do the 'compare libraries'?

I use a similar process using the Find Duplicates plugin->Find library duplicates feature

BR

[fvdham]

@BetterRed - I'am using the Find Duplicates plugin and I did check all my libs with the Library Maintenance tool . Nothing was wrong.

Is there an option to rebuild the library? (over 20.000 books)

Fred

[BetterRed]

@fvdham - if the check library didn't report any errors I'm not sure what good rebuilding it will do

Can you post screen shots of the settings you use in Find Duplicates->Library Duplicates and Preferences->Add Books

If you want to rebuild the database then I suggest you backup your library first, even though you think it is 'dodgy' its the best you have - right?

The Library Maintenance->Restore database feature will rebuild the database from those metadata.opf files you have no doubt noticed in the book folders

Could take a while, you might want to let it run overnight.

BR

[fvdham]

I have no idee what happened, but the problem is gone. I did not change any settings or whatsoever. Maybe it has to do with my SSD drive? I think I had this problem a few times after I installed a SSD .
Anyway thanks for your help

Fred

[BetterRed]

@fvdham - good oh, thanks for letting us know.

Calibre is a primarily database driven, the 'working' database is an in-memory version, the on-disk database only exists to persist changes, and the author/book folders only come into play when you want to do something with a format or cover image file. So... you might want to consider moving the libraries off the SSD and onto a spinning drive, the performance hit shouldn't be much.

BR

[fvdham]

I will try it when the problem reappears. I did not know about the 'working' database is being loaded into memory. I thought it was working directly on the hard drive.
Thanks for your reply. Everything is still working ok.

Fred