Kovid, do you need my previous DB
 

Hi Kovid,
I have restored the DB with the following errors:

calibre, version 0.8.31
WARNING: Riuscito: Il ripristino del database è avvenuto con alcuni avvisi, fai clic su Mostra dettagli per vedere i dettagli. Il vecchio database è stato salvato come: X:\Library\metadata_pre_restore.db

Failed to restore the books in the following folders:
X:\Library\John_ James\Hassett K. Bubbleology (Crown Business, (56761) with error:
Traceback (most recent call last):
File "site-packages\calibre\library\restore.py", line 125, in scan_library
File "site-packages\calibre\library\restore.py", line 147, in process_dir
File "site-packages\calibre\ebooks\metadata\opf2.py", line 560, in __init__
File "site-packages\calibre\ebooks\chardet\__init__.py", line 120, in xml_to_unicode
File "encodings\utf_8.py", line 16, in decode
MemoryError

X:\Library\_gsdata_\_saved_\1190\Microsoft Word - organigramma_consorzio_ (40500) with error:
Traceback (most recent call last):
File "site-packages\calibre\library\restore.py", line 125, in scan_library
File "site-packages\calibre\library\restore.py", line 147, in process_dir
File "site-packages\calibre\ebooks\metadata\opf2.py", line 556, in __init__
ValueError: Empty file: X:\Library\_gsdata_\_saved_\1190\Microsoft Word - organigramma_consorzio_ (40500)\metadata.opf

X:\Library\Sconosciuto\Approximation Algorithms for NP-HARD pro (47838) with error:
Traceback (most recent call last):
File "site-packages\calibre\library\restore.py", line 211, in restore_books
File "site-packages\calibre\library\restore.py", line 225, in restore_book
File "site-packages\calibre\library\database2.py", line 3193, in create_book_entry
File "site-packages\calibre\library\sqlite.py", line 313, in run
IntegrityError: PRIMARY KEY must be unique

Now the memory bursts have disappeared.

I have the OLD DB which caused the problem. Do you need it for debugging ?

Sure, open a ticket and attach it, it would be worth having a look.

Hi,
I have registered to launchpad but I don't see how to add a bug. Could you please help ?

Use the report a bug link in the top right corner of https://bugs.launchpad.net/calibre