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Old 04-27-2014, 07:52 AM   #1
Josieb1
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Hi

I am trying to delete some books via Calibre from my KOBO Aura. These are all sideloaded and Calibre has the KOBO Ulitilies plug in version 1.6.5.

I am getting this error message on Calibre verison 1.34 with my KOBO Aura software on version 3.30 and it was also on version 3.20.

Does this mean anything to anyone?

database disk image is malformed

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 86, in run
File "site-packages\calibre\gui2\device.py", line 595, in _delete_books
File "site-packages\calibre\devices\kobo\driver.py", line 496, in delete_books
File "site-packages\calibre\devices\kobo\driver.py", line 1999, in delete_via_sql
File "site-packages\calibre\devices\kobo\driver.py", line 428, in delete_via_sql
DatabaseError: database disk image is malformed
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Old 04-27-2014, 08:27 AM   #2
Josieb1
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I've managed to narrow it down to one book.
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Old 04-27-2014, 08:32 AM   #3
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The error means the database on the device is corrupted. You can check this by running the "Check device database" function of the utilities plugin.

Unless you have a recent backup of the database, you will need a new database. Logging out on the device and then logging in again will create a fresh database and reload the sideloaded books.
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Old 04-27-2014, 08:39 AM   #4
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But its only one book thats the problem, everything else is working okay.

By database I'm unsure what you mean. do you mean that i need to do a factory reset?
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Old 04-27-2014, 10:04 AM   #5
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The Kobo devices use a database to record information about the books on the device. This contains the metadata for the books and things like the reading status and shelves. When using the device, the information displayed is from the database. When calibre sees the device, it reads this database to get the information about what books are on the device.

If the database become corrupted, calibre will usually display this error message. You will usually see it when the device is first connected. When it happens, it means a table in the database that is being used by that function is corrupt. During a delete, five or six tables are touch. One of these is corrupt.

Other than calibre connecting to the device, a corrupted database causes other problems. The most common is disappearing books when the device is powered off and on. Or losing the reading status.

Fixing a corrupt database depends on what is wrong. If it is a broken index for a table, these can be fixed by rebuilding the index. I don't know how to fix other problems. If you run the "Check device database" function of the utilities plugin and posting the results, I can see what can be done.

But, as a general rule, if you don't have a recent backup of the database, it is simpler to let the device fix it. To do this, log out on the device. This isn't a factory reset. It doesn't remove the books from the device. It logs you out, clears the database and restarts. Then it asks you to do the setup again. After that, it will load all the sideloaded books into the database and hence the devices library. The log out is on the "Accounts" page of the settings.
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Old 04-27-2014, 01:40 PM   #6
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Thanks very much for the explanation. It seemed it be only a problem with two books so I deleted those manually on the kobo and so far everything now seems fine. I've made a note of what you said in case it becomes a problem further on. Thanks again.
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Old 04-27-2014, 11:47 PM   #7
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OK, if it is working, then great. If it happens again, can you take a copy of the database so I can have a look?
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