ITAGAKI Takahiro <[EMAIL PROTECTED]> writes:
> There might be regularity in the plan selection. When I connect to postgres
> newly, I see plans { A, B, A, A ... }. Then disconnect, re-connect and send
> the same EXPLAINs, the same pattern was reproduced.
Hmph ... maybe some effect associated with
Tom Lane <[EMAIL PROTECTED]> wrote:
> ITAGAKI Takahiro <[EMAIL PROTECTED]> writes:
> > I tested 8.3beta4 with DBT-3 (TPC-H) and found unstable selection of plans.
> > Planner randomly selected two types of plans (A, B) when I repeated EXPLAIN.
>
> Are you sure the statistics weren't changing und
ITAGAKI Takahiro <[EMAIL PROTECTED]> writes:
> I tested 8.3beta4 with DBT-3 (TPC-H) and found unstable selection of plans.
> Planner randomly selected two types of plans (A, B) when I repeated EXPLAIN.
Are you sure the statistics weren't changing underneath you (due to
auto-vacuum or auto-analyze)
I tested 8.3beta4 with DBT-3 (TPC-H) and found unstable selection of plans.
Planner randomly selected two types of plans (A, B) when I repeated EXPLAIN.
One of the conditions is used in Seq Scan Filter in Plan A. In contrast,
the same condition is used in Hash Join filter in Plan B. Plan A is
fast
