I am using two similar queries where one query is using index and other is
not.
I don't know why.
explain analyze
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
(9 rows)
\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)
\d ticketstatus
Table "public.ticketstatus"
Column | Type | Modifiers
------------------+------------------------+---------------------------------------------------------------
ticketstatus_id | integer | not null default
nextval('ticketstatus_seq'::regclass)
ticketstatus | character varying(200) |
presence | integer | not null default 0
picklist_valueid | integer | not null default 0
Indexes:
"ticketstatus_pkey" PRIMARY KEY, btree (ticketstatus_id)
Any help please.
