Aha. I shall give it a try, and see how I fare. Many thanks, Ian
On 3/6/07, Marco Bambini <[EMAIL PROTECTED]> wrote:
Are you using sqlite_prepare or sqlite_prepare_v2? If you use the v2 version I think that your problem will be solved... Regards, --- Marco Bambini http://www.sqlabs.net http://www.sqlabs.net/blog/ http://www.sqlabs.net/realsqlserver/ On Mar 6, 2007, at 2:22 PM, Ian Frosst wrote: > Hey all, I've got a bit of an odd situation going on. I have a fairly > heavily threaded app making use of SQLite (which is working > beautifully for > the most part.) However, I've run into a bit of a situation. It > seems that > I have a periodic occurrence of SQLITE_SCHEMA occurring when > executing some > queries. I've pretty much narrowed this down to the interaction of > two > threads working with the database. One is a simple insert, and the > other is > a fairly complicated db processing, consisting of three parts: > > 1) Create a temporary table with the results of a query > 2) Create an index on the temporary table > 3) Use the indexed temporary table in another query > > The reason I'm doing the above is that the query executed in step 3 > contains > a sub-query, which can potentially return a large amount of data. > I was > finding that without any type of indexing on the data coming back > from this > sub-query, my performance was unacceptable. > > My theory regarding the SQLITE_SCHEMA error is that the creation of > the > index on the temporary table is causing a change to the schema > revision > number, but I'm not quite familiar enough with the code to verify > this. I > was hoping someone on the list could enlighten me as to: > > - Whether creations of temporary tables, or the creation of indexes > on these > tables incur schema updates > - If the above is the case, whether there are any strategies for > avoiding > this situation. > > Thanks, > Ian ----------------------------------------------------------------------------- To unsubscribe, send email to [EMAIL PROTECTED] -----------------------------------------------------------------------------
