>> 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
...
As already mentioned by others, i do not see a major performance problem (atleast based on the information you gave) due to upgrading to 9.6.1. Do you have latest statistics in place ? What about data ?
If you can notice in the EXPLAIN output, there is a difference in the width. In 9.6.1 width is 32, any idea why ?