Horizontal Partitions - Not Working As Described

Apr 16, 2002

I am testing horizontal partitions to see whether it is a feasible
option for a project. IF I have a composite Primary Key and the
constraint column (a part of the Primary Key) that helps the
partitioned view is defined with DateTime Data Type, select on a restricted set of data through a partitioned view still tries to access all the tables instead of just one table that contains the data. Is this the case or am I
missing something ?

Any help on this is appreciated.


Here is what I am trying to do.

************************************************** **************

CREATE TABLE [dbo].[tst01] (
[Dt] datetime NOT NULL ,
[TID] int NOT NULL ,
[Nm] [char] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[tst02] (
[Dt] datetime NOT NULL ,
[TID] int NOT NULL,
[Nm] [char] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[tst01] ADD
CONSTRAINT [PK_tst01] PRIMARY KEY CLUSTERED
(
[Dt], [TID]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[tst02] ADD
CONSTRAINT [PK_tst02] PRIMARY KEY CLUSTERED
(
[Dt], [TID]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[tst01] ADD
CONSTRAINT [CK_tst01] CHECK (Dt between '11/1/2002' and '11/30/2002')
GO

ALTER TABLE [dbo].[tst02] ADD
CONSTRAINT [CK_tst02] CHECK (Dt between '12/1/2002' and '12/31/2002')
GO


insert into tst01 values('11/1/2002', 1, 'SS')
insert into tst01 values('11/2/2002', 2, 'KK')
insert into tst01 values('11/3/2002', 3, 'DD')
Go

insert into tst02 values('12/1/2002', 1, 'LL')
insert into tst02 values('12/2/2002', 2, 'MM')
insert into tst02 values('12/3/2002', 3, 'GG')
Go


CREATE VIEW vtst AS
SELECT * FROM tst01
UNION ALL
SELECT * FROM tst02
Go

SELECT * FROM vtst WHERE dt = '11/1/2002'

************************************************** *********

When I look at the Execution Plan, it shows that clustered index seek
would be performed on both the tables.


StmtText
---------------------------------------------------------------------------------------------------------------------------------
|--Concatenation
|--Filter(WHERE:(STARTUP EXPR(Convert([@1])<='Nov 30 2002
12:00AM' AND Convert([@1])>='Nov 1 2002 12:00AM')))
| |--Clustered Index
Seek(OBJECT:([test].[dbo].[tst01].[PK_tst01]),
SEEK:([tst01].[Dt]=Convert([@1])) ORDERED FORWARD)
|--Filter(WHERE:(STARTUP EXPR(Convert([@1])<='Dec 31 2002
12:00AM' AND Convert([@1])>='Dec 1 2002 12:00AM')))
|--Clustered Index
Seek(OBJECT:([test].[dbo].[tst02].[PK_tst02]),
SEEK:([tst02].[Dt]=Convert([@1])) ORDERED FORWARD)


Thanks,
Sathish

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