Re: [GENERAL] Postgres 9.6.1 big slowdown by upgrading 8.4.22

Hi guys,

 

really much appreciated your replies.

 

 >> You might want to include the query plans for each server 

 

W e use a function, the explain analyze is quite similar:

POSTGRESQL 8.4.22:

 

explain analyze select 'record.com' where 'record.com' like '%.%' and function_cloud_view_orari('53', '192.168.10.234', 'record.com') != '' limit 1;
                                                                               QUERY PLAN
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=0.03..0.04 rows=1 width=0) (actual time=1.488..1.488 rows=0 loops=1)
   ->  Result  (cost=0.03..0.04 rows=1 width=0) (actual time=1.485..1.485 rows=0 loops=1)
         One-Time Filter: ((function_cloud_view_orari('53'::character varying, '192.168.10.234'::character varying, 'record.com'::character varying))::text <> ''::text)
 Total runtime: 1.531 ms

 

POSTGRES 9.6.1:

explain analyze select 'record.com' where 'record.com' like '%.%' and function_cloud_view_orari('53', '192.168.10.234', 'record.com') != '' limit 1;
                                                                               QUERY PLAN
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=0.03..0.04 rows=1 width=32) (actual time=4.216..4.216 rows=0 loops=1)
   ->  Result  (cost=0.03..0.04 rows=1 width=32) (actual time=4.215..4.215 rows=0 loops=1)
         One-Time Filter: ((function_cloud_view_orari('53'::character varying, '192.168.10.234'::character varying, 'record.com'::character varying))::text <> ''::text)
 Planning time: 0.046 ms
 Execution time: 4.230 ms

 

There is only one condition that, by deleting, Query in new 9.6.1 Postgresql Server is very fast also on massive benchmark test.

The condition is this:

"exists ( select 1 from gruorari where gruorari.idgrucate=grucategorie.id and ( (('{'||gg_sett||'}')::int[] && array[EXTRACT(DOW FROM NOW())::int])='t' and  now()::time between gruorari.dalle::time and gruorari.alle::time) )"

 

We have a table of "weekly events", as example:

- monday from 12 to 14

- tuesday from 18 to 20

...