[sqlite] database schema has changed

[Ben Clewett]

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.