On 24 Mar 2014, at 1:34pm, Tim Streater <t...@clothears.org.uk> wrote:

> My app does some periodic housekeeping, which includes occasional vacuuming 
> of some files. From the logs, I deduce that the OS completely lost this file 
> [1], which got recreated at the next housekeeping and then vacuumed, thus 
> producing an uncorrupt but useless file, as of course it didn't have any 
> tables.

Strongly suspect broken hard disk (physically broken, and about to make loud 
noises soon) or corrupt disk format.  After taking a backup, try running an 
operating system level format check using CHKDSK, SCANDISK, Disk Utility, or 
whatever that platform has.

> I'm considering changing the app to use one or other of the flags 
> SQLITE_OPEN_READWRITE and SQLITE_OPEN_CREATE for when I expect the file to be 
> there or not, so the app gets immediate notification.

Good.

Simon.
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