[Info-Ingres] Invalidate cache

[Cecil Westerhof]

I have to do a performance test on severall different sets of queries. (The
old queries of the client and my replacement queries.) But to get a
reliable result the cache does have to be cleared before every query
offcourse. I understood that I could do this with the following statement:
        SET TRACE POINT DM421

But when I try to do this, I get 'You do not have permission to set trace
flags'. How do I set this permission? I am not a regular Ingres user. I was
just asked to solve his performance problem.
The client is working with Ingres Linux Version II 3.0.2.