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Old 08-29-2015, 05:14 PM   #1
Terisa de morgan
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Problem with database recover

Hi,

this morning, when I was going to switch to a library, calibre has told me that it was corrupted, and asked me if I wanted to recover it. After recovering it, I got the message that calibre couldn't recover it because another process was accessing to the file.

After checking at the forum, I switched off the antivirus and I tried it again. The same problem. Strangely, when I tried to remove metadata.db, I couldn't because "calibre had blocked the file". I switched on the antivirus again.

I closed calibre, copied the library directory, started calibre and tried again (although this time I copied an intermediate metadata.db prior to the error message). I tried to switch to the copy and same problem. I copied the intermediate metadata to the copy and this time the switch was OK (although not all the books were included).

Inside this library I tried the recover command and it worked this time.

I don't know which was the problem at the switch that doesn't exist being into the library, but well, perhaps this can help to somebody.
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Old 08-29-2015, 06:35 PM   #2
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Quote:
Originally Posted by Terisa de morgan View Post
I couldn't because "calibre had blocked the file".
That would seem to indicate you had two instances of calibre running.

And it is possible - by chance I recently discovered I could run calibre portable v 1.48, alongside calibre v2.20ish. Kovid is aware of that.

BR
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Old 08-29-2015, 06:37 PM   #3
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No, I only had one running, or it hadn't worked changing the method (and my calibre portable is 2.36 too). When I got that message calibre was still running but with other library.
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Old 08-29-2015, 06:50 PM   #4
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I also remember that long ago I was occasionally seeing orphaned *worker process" (calibre-parallel.exe) tasks running. Can't remember why, assuming I ever found out why. Can't remember the symptoms either - but nor I don't recall them being catastrophic.

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Old 08-29-2015, 08:55 PM   #5
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That can be a reason, I suppose, but I'm not aware of them.
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Old 08-30-2015, 01:03 AM   #6
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In my long ago case, something/someone must have been killing the main process without killing the children. But I'm fairly certain it didn't do any harm - certainly didn't corrupt databases, I'd remember that.

I suspect I was doing something a bit odd, I don't recall posting anything here about it. Was in my early calibre days.

All I can suggest is to run frequent library checks and take regular backups - but I suspect you don't need me to tell you that

BR

Last edited by BetterRed; 08-30-2015 at 01:29 AM.
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Old 08-30-2015, 03:03 AM   #7
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Nooo, it was unsuspected, and the problem is I have synced prior to the check. In the end, well, only a bit stress until I was able to repair it in that non orthodox way.
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Old 08-30-2015, 03:37 AM   #8
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Synced prior to the check -- well, it might be worth considering using rotating snapshots rather than a single mirror.

Then you could restore to any of the e.g. last five times you ran the backup.
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Old 08-30-2015, 03:55 AM   #9
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Quote:
Originally Posted by eschwartz View Post
Synced prior to the check -- well, it might be worth considering using rotating snapshots rather than a single mirror.

Then you could restore to any of the e.g. last five times you ran the backup.
Windows here... is there any free program for it? Anyway... I made the sync just after closing calibre
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Old 08-30-2015, 04:25 AM   #10
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Well, I have traditionally used a very scripted solution with rsync, but both bash and rsync are available for Windows courtesy of cygwin.
No chance in hell of btrfs snapshots though.

http://webgnuru.com/linux/rsync_incremental.php



Just set your sync program to backup to a folder that contains the current date. If it has a cli mode, that should be easy. Without something like rsync's --link-dest (hardlink from "b" to identical files in "c", instead of copying from "a" to "b"), that will require all the time of a full backup, and the space of one too.
FreeFileSync includes "macros" a/k/a variables: http://www.freefilesync.org/manual.php?topic=macros
And builtin "versioning", not sure if that creates full, hardlinked versioned backups or just versions containing old copies of changed files -- the former is what I use, no additional space costs but, visually, far more comprehensible.
http://www.freefilesync.org/manual.php?topic=versioning

I hate to recommend FreeFileSync since it comes bundled with spamware.

Last edited by eschwartz; 08-30-2015 at 04:40 AM.
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Old 08-30-2015, 05:40 AM   #11
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I use SyncToy, not manual backup, so not a lot of improvement with FreeFyleSync (I didn't check it because of the malware). I use cygwin a lot so that wouldn't be a problem, but I think that I'm going to use a more "traditional" approach, as no snapshots available. A weekly sync at a different path, and checking all the modified libraries prior to the sync. Well, it can be done...
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Old 08-30-2015, 05:15 PM   #12
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Sure can.

Synctoy appears to have command-line switches: http://www.windowstipspage.com/synct...line-switches/

Use a datestring: https://stackoverflow.com/questions/...s-batch-script
Apparently it can be done in a sane way using powershell.
Or cygwin's `date +FORMAT`

At that point, though, you might as well be using rsync
Going the other, fully GUI way, I don't know that anything other than FreeFileSync offers the needed flexibility.
PortableApps.com offers an older malware-free version of FreeFileSync.



People have written GUIs for rsync on linux, maybe it's about time someone did the same for Windows. Lotta flexibility there.
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