simple-scan-team team mailing list archive

[Timo Kluck <897469@xxxxxxxxxxxxxxxxxx>]

> 1- how does sqlite handle crashing? this patch will not improve the
> situation if one ends up with a corrupted sqlite database... does it do
> transactions or do you have something like fsync to force writeout ...

According to [1], Sqlite is extremely reliable in this regard. "All
changes within a single transaction in SQLite either occur completely
or not at all, even if the act of writing the change out to the disk
is interrupted by a program crash, an operating system crash, or a
power failure."

> 2- as far as i can tell the feature request from (amongst other reports)
> Bug #483392 -- namely: resuming a previous session -- could be trivially
> solved with the same underlying code if there was an option to
> gracefully exit simple-scan while leaving behind the sqlite-entry that
> will tigger "recovery" on the next startup. could you look into adding
> this?

You're right, this would be trivial. It just needs UI design. It
possibly makes sense to just have this as the default behaviour,
because it is easy enough to click the file -> new button. Or make it
default behaviour in case of unsaved changes.

[1] http://sqlite.org/transactional.html

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Scan Development Team, which is the registrant for Simple Scan.
https://bugs.launchpad.net/bugs/897469

Title:
  Simple Scan crashes result in preventable data loss

Status in Simple Scan:
  Triaged

Bug description:
  As a matter of fact Simple Scan crashes often. Bad drivers, Out Of
  Memory Problems, ...

  These problems should be fixed, but for the meanwhile it would be worthwhile to minimize data and time lost in such cases.
  For the bad drivers cases there already is Bug #564357 but especially for the OOM problem and to take some pressure from the complex Bug #564357 I suggest to look for other ways to minimize data loss.

  Ideas: 
  - save work to temporary files, and optimally allow to recover from such files (can perfectly be combined with the feature request to manually load a file at startup to add pages to that file).
  - ...

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