>> So its not just PostgreSQL that is suffering from the bad SQL but MySQL also. But
>> the
>> question is my does PostgreSQL suffer so badly ?? I think not all developers write
>> very nice
>> SQLs.
>>
>> Its really sad to see that a fine peice of work (RT) is performing sub-optimal
>> becoz of
>> malformed SQLs. [ specially on database of my choice ;-) ]
>
> Post EXPLAIN ANALYZES of the queries you're running, then maybe you'll be able to
> get some
> useful help from this list. Until then, it's very hard to speculate as to why
> PostgreSQL is
> slower. -sc
Here It is:
in case they are illegeble please lemme know i will attach it as .txt
files.
Slower One:
explain analyze SELECT DISTINCT main.* FROM Groups main , Principals Principals_1, ACL
ACL_2
WHERE ((ACL_2.RightName = 'OwnTicket')OR(ACL_2.RightName = 'SuperUser')) AND ( (
ACL_2.PrincipalId = Principals_1.id AND ACL_2.PrincipalType = 'Group' AND (
main.Domain =
'SystemInternal' OR main.Domain = 'UserDefined' OR main.Domain = 'ACLEquivalence') AND
main.id =
Principals_1.id) OR ( ( (main.Domain = 'RT::Queue-Role' AND main.Instance = 25) OR (
main.Domain
= 'RT::Ticket-Role' AND main.Instance = 6973) ) AND main.Type = ACL_2.PrincipalType
AND main.id
= Principals_1.id) ) AND (ACL_2.ObjectType = 'RT::System' OR (ACL_2.ObjectType =
'RT::Queue' AND
ACL_2.ObjectId = 25) ) ORDER BY main.Name ASC ;
Unique (cost=4744.06..4744.08 rows=1 width=81) (actual time=6774.140..6774.204 rows=5
loops=1)
-> Sort (cost=4744.06..4744.07 rows=1 width=81) (actual time=6774.136..6774.145
rows=6 loops=1)
Sort Key: main.name, main.id, main.description, main."domain", main."type",
main.instance
-> Nested Loop (cost=1788.68..4744.05 rows=1 width=81) (actual
time=597.744..6774.042
rows=6 loops=1) Join Filter: (((("inner".principaltype)::text =
'Group'::text) OR
(("outer"."domain")::text = 'RT::Ticket-Role'::text) OR
(("outer"."domain")::text =
'RT::Queue-Role'::text)) AND ((("inner".principaltype)::text =
'Group'::text) OR
(("outer".instance)::text = '6973'::text) OR (("outer"."domain")::text =
'RT::Queue-Role'::text)) AND ((("inner".principaltype)::text =
'Group'::text) OR
(("outer"."domain")::text = 'RT::Ticket-Role'::text) OR
(("outer".instance)::text =
'25'::text)) AND ((("inner".principaltype)::text = 'Group'::text) OR
(("outer".instance)::text = '6973'::text) OR (("outer".instance)::text =
'25'::text)) AND ((("inner".principaltype)::text = 'Group'::text) OR
(("outer"."type")::text = ("inner".principaltype)::text)) AND
((("outer"."domain")::text = 'SystemInternal'::text) OR
(("outer"."domain")::text =
'UserDefined'::text) OR (("outer"."domain")::text =
'ACLEquivalence'::text) OR
(("outer"."type")::text = ("inner".principaltype)::text)) AND
(("inner".principalid
= "outer".id) OR (("outer"."domain")::text = 'RT::Ticket-Role'::text) OR
(("outer"."domain")::text = 'RT::Queue-Role'::text)) AND
(("inner".principalid =
"outer".id) OR (("outer".instance)::text = '6973'::text) OR
(("outer"."domain")::text = 'RT::Queue-Role'::text)) AND
(("inner".principalid =
"outer".id) OR (("outer"."domain")::text = 'RT::Ticket-Role'::text) OR
(("outer".instance)::text = '25'::text)) AND (("inner".principalid =
"outer".id) OR
(("outer".instance)::text = '6973'::text) OR (("outer".instance)::text =
'25'::text)) AND (("inner".principalid = "outer".id) OR
(("outer"."type")::text =
("inner".principaltype)::text)) AND (("outer".id = "outer".id) OR
(("outer"."type")::text = ("inner".principaltype)::text)) AND
(("inner".principalid
= "outer".id) OR ("outer".id = "outer".id)) AND
((("inner".principaltype)::text =
'Group'::text) OR ("outer".id = "outer".id))) -> Merge
Join (cost=1788.68..4735.71 rows=1 width=85) (actual
time=597.540..1340.526 rows=20153 loops=1) Merge
Cond: ("outer".id = "inner".id)
Join Filter: ((("inner".id = "outer".id) OR
(("inner"."domain")::text =
'RT::Ticket-Role'::text) OR (("inner"."domain")::text =
'RT::Queue-Role'::text)) AND (("inner".id = "outer".id) OR
(("inner".instance)::text = '6973'::text) OR
(("inner"."domain")::text =
'RT::Queue-Role'::text)) AND (("inner".id = "outer".id) OR
(("inner"."domain")::text = 'RT::Ticket-Role'::text) OR
(("inner".instance)::text = '25'::text)) AND (("inner".id =
"outer".id) OR
(("inner".instance)::text = '6973'::text) OR
(("inner".instance)::text =
'25'::text)) AND ((("inner"."domain")::text =
'SystemInternal'::text) OR
(("inner"."domain")::text = 'UserDefined'::text) OR
(("inner"."domain")::text
= 'ACLEquivalence'::text) OR ("inner".id = "outer".id)))
-> Index Scan using principals_pkey on principals principals_1
(cost=0.00..2536.49 rows=82221 width=4) (actual
time=0.073..248.849
rows=64626 loops=1) -> Sort
(cost=1788.68..1797.99 rows=3726 width=81) (actual
time=597.360..645.859 rows=20153 loops=1)
Sort Key: main.id
-> Index Scan using groups_domain, groups_domain,
groups_domain,
groups_lower_instance, groups_domain on groups main
(cost=0.00..1567.66 rows=3726 width=81) (actual
time=0.105..456.682
rows=20153 loops=1) Index
Cond: ((("domain")::text = 'SystemInternal'::text) OR
(("domain")::text = 'UserDefined'::text) OR
(("domain")::text =
'ACLEquivalence'::text) OR ((instance)::text =
'6973'::text) OR
(("domain")::text = 'RT::Queue-Role'::text))
Filter: (((("domain")::text = 'SystemInternal'::text) OR
(("domain")::text = 'UserDefined'::text) OR
(("domain")::text =
'ACLEquivalence'::text) OR (("domain")::text =
'RT::Ticket-Role'::text) OR (("domain")::text =
'RT::Queue-Role'::text)) AND ((("domain")::text =
'SystemInternal'::text) OR (("domain")::text =
'UserDefined'::text) OR (("domain")::text =
'ACLEquivalence'::text) OR (("domain")::text =
'RT::Ticket-Role'::text) OR ((instance)::text =
'25'::text)) AND
((("domain")::text = 'SystemInternal'::text) OR
(("domain")::text
= 'UserDefined'::text) OR (("domain")::text =
'ACLEquivalence'::text) OR ((instance)::text =
'6973'::text) OR
((instance)::text = '25'::text))) ->
Index Scan using acl_objectid, acl_objecttype on acl acl_2 (cost=0.00..8.03
rows=3 width=13) (actual time=0.034..0.150 rows=6 loops=20153)
Index Cond: ((objectid = 25) OR ((objecttype)::text = 'RT::System'::text))
Filter: ((((rightname)::text = 'OwnTicket'::text) OR
((rightname)::text =
'SuperUser'::text)) AND (((objecttype)::text = 'RT::Queue'::text)
OR
((objecttype)::text = 'RT::System'::text))) Total runtime:
6778.888 ms
BETTER ONE:
explain analyze SELECT DISTINCT main.* FROM Groups main join Principals
Principals_1 using(id)
join ACL ACL_2 on (ACL_2.PrincipalId = Principals_1.id) WHERE ((ACL_2.RightName =
'OwnTicket')OR(ACL_2.RightName = 'SuperUser')) AND ( ( ACL_2.PrincipalType =
'Group' AND (
main.Domain = 'SystemInternal' OR main.Domain = 'UserDefined' OR main.Domain =
'ACLEquivalence') )
OR ( ( (main.Domain = 'RT::Queue-Role' AND main.Instance = 25) OR ( main.Domain =
'RT::Ticket-Role' AND main.Instance = 6973) ) AND main.Type = ACL_2.PrincipalType )
) AND
(ACL_2.ObjectType = 'RT::System' OR (ACL_2.ObjectType = 'RT::Queue' AND
ACL_2.ObjectId = 25) )
ORDER BY main.Name ASC ;
Unique (cost=22.18..22.20 rows=1 width=81) (actual time=0.878..0.910 rows=5 loops=1)
-> Sort (cost=22.18..22.19 rows=1 width=81) (actual time=0.875..0.881 rows=6
loops=1)
Sort Key: main.name, main.id, main.description, main."domain", main."type",
main.instance
-> Nested Loop (cost=0.00..22.17 rows=1 width=81) (actual time=0.255..0.814
rows=6
loops=1) -> Nested Loop (cost=0.00..17.54 rows=1 width=85)
(actual time=0.194..0.647
rows=6 loops=1) Join Filter:
(((("outer".principaltype)::text = 'Group'::text) OR
(("inner"."domain")::text = 'RT::Ticket-Role'::text) OR
(("inner"."domain")::text = 'RT::Queue-Role'::text)) AND
((("outer".principaltype)::text = 'Group'::text) OR
(("inner".instance)::text
= '6973'::text) OR (("inner"."domain")::text =
'RT::Queue-Role'::text)) AND
((("outer".principaltype)::text = 'Group'::text) OR
(("inner"."domain")::text
= 'RT::Ticket-Role'::text) OR (("inner".instance)::text =
'25'::text)) AND
((("outer".principaltype)::text = 'Group'::text) OR
(("inner".instance)::text
= '6973'::text) OR (("inner".instance)::text = '25'::text)) AND
((("outer".principaltype)::text = 'Group'::text) OR
(("inner"."type")::text =
("outer".principaltype)::text)) AND ((("inner"."domain")::text =
'SystemInternal'::text) OR (("inner"."domain")::text =
'UserDefined'::text)
OR (("inner"."domain")::text = 'ACLEquivalence'::text) OR
(("inner"."type")::text = ("outer".principaltype)::text)))
-> Index Scan using acl_objectid, acl_objecttype on acl acl_2
(cost=0.00..8.03 rows=3 width=13) (actual time=0.064..0.190
rows=6 loops=1) Index Cond: ((objectid = 25) OR
((objecttype)::text = 'RT::System'::text))
Filter: ((((rightname)::text = 'OwnTicket'::text) OR
((rightname)::text
= 'SuperUser'::text)) AND (((objecttype)::text =
'RT::Queue'::text) OR
((objecttype)::text = 'RT::System'::text)))
-> Index Scan using groups_pkey on groups main (cost=0.00..3.11 rows=1
width=81) (actual time=0.050..0.051 rows=1 loops=6)
Index Cond: ("outer".principalid = main.id)
Filter: (((("domain")::text = 'SystemInternal'::text) OR
(("domain")::text = 'UserDefined'::text) OR
(("domain")::text =
'ACLEquivalence'::text) OR (("domain")::text =
'RT::Ticket-Role'::text)
OR (("domain")::text = 'RT::Queue-Role'::text)) AND
((("domain")::text
= 'SystemInternal'::text) OR (("domain")::text =
'UserDefined'::text)
OR (("domain")::text = 'ACLEquivalence'::text) OR
((instance)::text =
'6973'::text) OR (("domain")::text =
'RT::Queue-Role'::text)) AND
((("domain")::text = 'SystemInternal'::text) OR
(("domain")::text =
'UserDefined'::text) OR (("domain")::text =
'ACLEquivalence'::text) OR
(("domain")::text = 'RT::Ticket-Role'::text) OR
((instance)::text =
'25'::text)) AND ((("domain")::text =
'SystemInternal'::text) OR
(("domain")::text = 'UserDefined'::text) OR
(("domain")::text =
'ACLEquivalence'::text) OR ((instance)::text =
'6973'::text) OR
((instance)::text = '25'::text))) -> Index
Scan using principals_pkey on principals principals_1 (cost=0.00..4.62
rows=1 width=4) (actual time=0.017..0.019 rows=1 loops=6)
Index Cond: ("outer".principalid = principals_1.id)
Total runtime: 1.151 ms
(15 rows)
>
> --
> Sean Chittenden
>
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