Re: Perfomance 9.1.9 vs 9.4.1

Hi

2015-03-15 10:50 GMT+01:00 Alexander Uspensky <al(dot)v(dot)uspensky(at)gmail(dot)com>:

> Dear,
>
> I am comparing 9.1.9 and 9.4.1. I think that perfomance of 9.4.1 should be
> better.
> But I have an issue here.
> I have installed both db on the same machine and I have 2 results,
> where I see that for some reason 9.1.9 works faster - 118ms vs 452ms.
> I checked the same sql query with EXPLAIN ANALYZE (with the same work_mem
> =8MB and shared_buffers = 128MB).
> Could you please help me what should I do to solve it?
>
> 1) 9.1.9
> Limit (cost=6435.41..6435.41 rows=1 width=10) (actual
> time=118.720..118.723 rows=25 loops=1)
> -> Sort (cost=6435.41..6435.41 rows=1 width=10) (actual
> time=118.719..118.720 rows=25 loops=1)
> ...
> Total runtime: 118.921 ms
> (48 rows)
>
> 2) 9.4.1
> Limit (cost=507.65..507.66 rows=1 width=10) (actual time=452.124..452.127
> rows=25 loops=1)
> -> Sort (cost=507.65..507.66 rows=1 width=10) (actual
> time=451.760..451.760 rows=25 loops=1)
>

please, send complete plan - from this part is not possible to see where is
a problem

Regards

Pavel

> ...
> Planning time: 3.406 ms
> Execution time: 452.297 ms
> (51 rows)
>
> --
> Best regards, Alexander
>