On Wed, 15 Feb 2017, Simon Slavin wrote:
On 14 Feb 2017, at 11:51pm, Bob Friesenhahn <bfrie...@simple.dallas.tx.us>
wrote:
One of our Linux programs (not written by me) is reporting errors of the form
"SQLITE_CORRUPT: database disk image is malformed database corruption".
Is the database actually corrupt ? Even if your other threads are
not reporting this corruption, it may be real until you’ve checked.
Can you use the shell tool to execute
I don't know if it is corrupt. I added query code to the program
which reports the problem, causes a core dump, and then the whole
device reboots. Queries written by someone else just prints a message
and carries on. We use a design in that the working database is in a
RAM disk and so after the device reboots, the problem database is
gone.
Sometimes sqlite3_step() reports the problem and sometimes
sqlite3_finalize() reports the problem.
PRAGMA integrity_check
on it and find out ?
I may be able to add code which automatically does this.
It is noteworthy that none of the other programs are encountering this
problem, yet all of those programs perform SQL queries from just one
thread. Some developers did try to do queries from multiple threads
and encountered severe problems and so they changed their design to
use just one thread.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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