Kevin Brown <kevin(at)sysexperts(dot)com> writes:
> This is why I sometimes wonder whether or not it would be a win to use
> mmap() to access the data and index files --
mmap() is Right Out because it does not afford us sufficient control
over when changes to the in-memory data will propagate to disk. The
address-space-management problems you describe are also a nasty
headache, but that one is the showstopper.
regards, tom lane