Re: PostgreSQL 7.4beta5 vs MySQL 4.0.16 with RT(DBIx::SearchBuilder) - Mailing list pgsql-performance

Actually PostgreSQL is at par with  MySQL when the query is being Properly Written(simplified)
 like below

rt3=#  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 ;
  id   |    name    |        description        |     domain     |   type    | instance
-------+------------+---------------------------+----------------+-----------+----------
 40264 | sales      | Sales team in Delhi       | UserDefined    |           |
     2 | User 1     | ACL equiv. for user 1     | ACLEquivalence | UserEquiv | 1
    11 | User 10    | ACL equiv. for user 10    | ACLEquivalence | UserEquiv | 10
    13 | User 12    | ACL equiv. for user 12    | ACLEquivalence | UserEquiv | 12
 31123 | User 31122 | ACL equiv. for user 31122 | ACLEquivalence | UserEquiv | 31122
(5 rows)

( Total runtime: 1.699 ms )
Time: 6.455 ms which is 0.00 6455 Secs


In mysql:
mysql> 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 ;+-------+------------+---------------------------+----------------+-----------+----------+
| id    | Name       | Description               | Domain         | Type      | Instance |
+-------+------------+---------------------------+----------------+-----------+----------+
| 40208 | sales      | Sales team in Delhi       | UserDefined    |           |          |
|     2 | User 1     | ACL equiv. for user 1     | ACLEquivalence | UserEquiv | 1        |
|    11 | User 10    | ACL equiv. for user 10    | ACLEquivalence | UserEquiv | 10       |
|    13 | User 12    | ACL equiv. for user 12    | ACLEquivalence | UserEquiv | 12       |
| 31067 | User 31066 | ACL equiv. for user 31066 | ACLEquivalence | UserEquiv | 31066    |
+-------+------------+---------------------------+----------------+-----------+----------+
5 rows in set (0.00 sec)

mysql>

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 ;-) ]



Regds
Mallah.

>
> Dear PostgreSQL gurus,
>
> I really not intend to start a flame war here but i am genuinely
> seeking help to retain PostgreSQL as my database for my RT
> system.
>
> Few months back i had posted regarding lowering of column names in SQL being passed to RDBMS by
> DBIx::SearchBuilder , looks like it was controlled by a parameter "CASESENSITIVE" changing it
> to 1 from 0 did help for postgresql to MySQL it probably does not matter.
>
>
> But This time its a different situation
> The query in Postgresql is taking  6 times more than MySQL
>
> The Query being given gets generated by DBIx::SearchBuilder.
> Although i am not sure but i feel modules like DBIx::SearchBuilder which are supposed to
> provide RDBMS independent abstraction  are unfortunately getting test only with MySQL or Oracle
> otherwise such huge difference in timing were not possible.
>
>
>
> IN MYSQL:
> ========
> mysql>  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
> ;+-------+------------+---------------------------+----------------+-----------+----------+ |
> id    | Name       | Description               | Domain         | Type      | Instance |
> +-------+------------+---------------------------+----------------+-----------+----------+ |
> 40208 | sales      | Sales team in Delhi       | UserDefined    |           |          | |
> 2 | User 1     | ACL equiv. for user 1     | ACLEquivalence | UserEquiv | 1        | |    11 |
> User 10    | ACL equiv. for user 10    | ACLEquivalence | UserEquiv | 10       | |    13 | User
> 12    | ACL equiv. for user 12    | ACLEquivalence | UserEquiv | 12       | | 31067 | User
> 31066 | ACL equiv. for user 31066 | ACLEquivalence | UserEquiv | 31066    |
> +-------+------------+---------------------------+----------------+-----------+----------+ 5
> rows in set (0.94 sec)
>
> mysql>
>
> WHEREAS for PostgreSQL:
> rt3=# SELECT version();
> PostgreSQL 7.4beta5 on i686-pc-linux-gnu, compiled by GCC 2.96
>
>
> rt3=# 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
> ;+-------+------------+---------------------------+----------------+-----------+----------+ |
> id   |    name    |        description        |     domain     |   type    | instance |
> +-------+------------+---------------------------+----------------+-----------+----------+ |
> 40264 | sales      | Sales team in Delhi       | UserDefined    |           |          | |
> 2 | User 1     | ACL equiv. for user 1     | ACLEquivalence | UserEquiv | 1        | |    11 |
> User 10    | ACL equiv. for user 10    | ACLEquivalence | UserEquiv | 10       | |    13 | User
> 12    | ACL equiv. for user 12    | ACLEquivalence | UserEquiv | 12       | | 31123 | User
> 31122 | ACL equiv. for user 31122 | ACLEquivalence | UserEquiv | 31122    |
> +-------+------------+---------------------------+----------------+-----------+----------+ (5
> rows)
> Time: 7281.574 ms
> rt3=#
>
> Explain Analyze of Above Query is being given below:
>
> Unique  (cost=4744.06..4744.08 rows=1 width=81) (actual time=6179.789..6179.828 rows=5 loops=1)
>   ->  Sort  (cost=4744.06..4744.07 rows=1 width=81) (actual time=6179.785..6179.792 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=584.004..6179.712 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=583.804..1187.448 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=0.087..169.725 rows=64626 loops=1)                     ->  Sort
>                     (cost=1788.68..1797.99 rows=3726 width=81) (actual time=583.624..625.604
>                     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=0.132..449.240
>                           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=0.032..0.138 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: 6183.155 ms [ 6
>                     secs approx ]
> (18 rows)
>
> Sincerely Looking Forward to a Help
> Regds
> Mallah
>
>
>
>
>
>
>
>
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