Re: Re: Re: [GENERAL] 回复: postgres cpu 100% need help

On 10/28/2015 12:12 AM, 657985552(at)qq(dot)com wrote:
> Thank you for your reply.
> tshow=> explain (analyze, buffers) select count(t.*) from tshow.res_room_weight t,tshow.res_room_info r
>
> tshow-> where t.subcatlg_id=46
> tshow-> and t.roomid = r.actorid
> tshow-> and r.levels>=0;

http://explain.depesz.com/s/oKN5

shows where the time is spent in that query, but as you say, that one
the timing was fine. there's a lot of time being spent in a seq_scan
of res_room_info.

I would have written that query as the inner join it is, but that
probably won't effect how it's executed.

select ... from tshow.res_room_weight t join tshow.res_room_info r on
(t.roomid = r.actorid) where t.subcatlg_id=46 and r.levels>=0;

--
john r pierce, recycling bits in santa cruz