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On 24/10/11 13:23, Volker Jahns wrote:
> Any help is greatly appreciated on how to solve this issue.

You have given no way for anyone else to try to repeat the issue.  We
can't see your source code and it is unlikely your benchmark is the first
to have no bugs whatsoever.  Two sql scripts, one to populate the
databases with identical content and one to run the query would help.  It
isn't obvious if the timings are from running the query once or from a
large number of runs.  If the former then you really will get something
close to random numbers.

In any event this test is completely bogus in many ways.  You are altering
the processor speed & cores, RAM, operating system, SQLite version, hard
drive and other programs that are running for each one.  They will all
affect the performance of a query.

Unless the Dell machine you are running MacOS on (!?) is using an SSD, its
timing is nonsense and certainly not repeatable as it is less than the
seek time of even current hard drives - ie something is lying about data
being on disk platters.

Roger

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