Thread: Query tune, index is not using

select ticketstatus 
from ticketstatus 
inner join role2picklist on role2picklist.picklistvalueid=ticketstatus.picklist_valueid 
where roleid!='H1' order by sortid

  QUERY PLAN  
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort (cost=2053.15..2055.23 rows=834 width=422) (actual time=6.929..7.805 rows=952 loops=1)
  Sort Key: role2picklist.sortid
  -> Nested Loop (cost=0.00..2012.68 rows=834 width=422) (actual time=0.151..5.109 rows=952 loops=1)
  -> Seq Scan on ticketstatus (cost=0.00..1.12 rows=12 width=422) (actual time=0.029..0.046 rows=12 loops=1)
  -> Index Scan using role2picklist_picklistvalueid_idx on role2picklist (cost=0.00..166.77 rows=69 width=8) (actual time=0.021..0.251 rows=79 loops=12)
  Index Cond: (role2picklist.picklistvalueid = "outer".picklist_valueid)
  Filter: ((roleid)::text <> 'H1'::text)
 Total runtime: 9.042 ms
(8 rows)


explain analyze
select cf_1507 
from cf_1507 
inner join role2picklist on role2picklist.picklistvalueid=cf_1507.picklist_valueid 
where roleid!='H1' order by sortid

  QUERY PLAN  
-----------------------------------------------------------------------------------------------------------------------------------------
 Sort (cost=5989.07..5998.27 rows=3682 width=422) (actual time=545.203..548.895 rows=4037 loops=1)
  Sort Key: role2picklist.sortid
  -> Hash Join (cost=1.66..5350.24 rows=3682 width=422) (actual time=5.817..536.341 rows=4037 loops=1)
  Hash Cond: ("outer".picklistvalueid = "inner".picklist_valueid)
  -> Seq Scan on role2picklist (cost=0.00..4208.30 rows=220692 width=8) (actual time=0.011..297.592 rows=220788 loops=1)
  Filter: ((roleid)::text <> 'H1'::text)
  -> Hash (cost=1.53..1.53 rows=53 width=422) (actual time=0.161..0.161 rows=53 loops=1)
  -> Seq Scan on cf_1507 (cost=0.00..1.53 rows=53 width=422) (actual time=0.020..0.087 rows=53 loops=1)
 Total runtime: 553.567 ms

On 5 Oct 2010, at 10:21, AI Rumman wrote:

> explain analyze
> select cf_1507
> from cf_1507
> inner join role2picklist on role2picklist.picklistvalueid=cf_1507.picklist_valueid
> where roleid!='H1' order by sortid

A few indexes on role2picklist.sortid and cf_1507.picklist_valueid would probably help.

> \d role2picklist
>   Table "public.role2picklist"
>   Column | Type | Modifiers
> -----------------+------------------------+-----------
>  roleid | character varying(255) | not null
>  picklistvalueid | integer | not null
>  picklistid | integer | not null
>  sortid | integer |
> Indexes:
>   "role2picklist_pkey" PRIMARY KEY, btree (roleid, picklistvalueid, picklistid)
>   "fk_2_role2picklist" btree (picklistid)
>   "role2picklist_picklistvalueid_idx" btree (picklistvalueid)
>   "role2picklist_roleid_picklistid_idx" btree (roleid, picklistid, picklistvalueid)
>
> \d cf_1507
>   Table "public.cf_1507"
>   Column | Type | Modifiers
> ------------------+------------------------+----------------------------------------------------------
>  cf_1507id | integer | not null default nextval('cf_1507_seq'::regclass)
>  cf_1507 | character varying(200) | not null
>  presence | integer | not null default 1
>  picklist_valueid | integer | not null default 0
> Indexes:
>   "cf_1507_pkey" PRIMARY KEY, btree (cf_1507id)

Alban Hertroys

--
If you can't see the forest for the trees,
cut the trees and you'll see there is no forest.


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