Re: Testing of MVCC

Tom Lane schrieb:
> Greg Stark <gsstark@mit.edu> writes:
> 
>>So why bother with driving multiple invocations of psql under
>>Expect. Just use DBD::Pg to open as many connections as you want and
>>issue whatever queries you want.
> 
> 
> The bit that I think is missing in DBI is "issue a command and don't
> wait for the result just yet".  Without that, you cannot for instance
> stack up several waiters for the same lock, as you might wish to do to
> verify that they get released in the correct order once the original
> lock holder goes away.  Or stack up some conflicting waiters and check
> to see if deadlock is detected when it should be ... or contrariwise,
> not signalled when it should not be.  There's lots of stuff you can
> do that isn't exactly probing for race conditions, yet would be awfully
> nice to check for in a routine test suite.
> 
> I might be wrong though, not being exactly a DBI guru ... can this
> sort of thing be done?
> 
I wonder if you dont have a wrapper around libpq you can use like that?