Tito Ciuro wrote:
Hi Ben,
What do you mean? Try to reopen the database after VACUUM. That should
do it...
The posting seemed to indicate a user was experiencing the 'database
schema has changed' during the first INSERT after a VACUUM.
The suggested solution was to close/open the db after the VACUUM.
I've tried creating tables with millions of rows, deleting various
amounts of data, VACUUM and then INSERT. I cannot replicate this error.
It always works. Possible this was related to an older version of
SQLite, or there is some special case of VACUUM which I am not encountering.
The only time I get this message is when another thread executes a query
during a VACUUM. I use the 'prepare statement' method, and my guess is
that the prepare and execute on one thread, straddle the VACUUM from
another, and hence fail.
But maybe I am missing something... :)
Ben
-- Tito
On 02/06/2005, at 9:36, Ben Clewett wrote:
Ben Clewett wrote:
So as I understand the posting. After each VACUUM it is advisable
to shutdown and restart SQLite, or run a single INSERT to clear the
error...
After a lot of testing, I can find no instance of where SQLite needs
restarting, or anything else after a VACUUM. Although maybe some
locking may be needed during the VACUUM in a multi-thread scenario.
Ben
I'll do some testing :)
Ben
Tito Ciuro wrote:
Hi Ben,
Check this post and see if it helps: http://www.mail-archive.com/
sqlite-users@sqlite.org/msg04887.html
Regards,
-- Tito
On 01/06/2005, at 12:16, Ben Clewett wrote:
Some extra information:
I also note I run a VACUUM every 50 minutes. Could this result
in the "database schema has changed" message I sometimes see?
Possibly one thread accessing database during VACUUM?
Kind regards,
Ben Clewett.
Ben Clewett wrote:
Dear SQLite,
I am experiencing a problem. Every so often, say one in 100,000
'SELECT' queries, I get this error:
"database schema has changed"
This is false, the schema has not changed.
Can any person offer a reason why this might be, and possibly a
solution to this problem?
I am using SQLite 3.1.6 and storing my database on /dev/shm.
Kind regards,
Ben Clewett.
______________________________________
Tito Ciuro
http://www.webbo.com
______________________________________
Tito Ciuro
http://www.webbo.com
