On 7/23/07, Alvaro Herrera <[EMAIL PROTECTED]> wrote:
Certainly it doesn't prevent starvation completely -- really there is no
way to completely prevent starvation unless you have as many workers as
you have tables, and one disk for each. What DSM does do is let the big
tables be vacuumed quickly which makes most of the problem go away.
Frankly I haven't seen DSM results very closely, but DSM can help
us avoid full heap scans (and thats a big thing!), but it can't avoid the
associated index scans and that might limit our ability to vacuum very
large tables frequently.