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 underneath you (due to
> auto-vacuum or auto-analyze)?
Sure. There were no statistic changes.
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.
Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center
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