Partitioning Example

--------------------------------
-- Create A Partitioned Table --
--------------------------------
 
/* Create a partition function. */
Create Partition Function [test_monthlyDateRange_pf] (smalldatetime) 
    As Range Right For Values 
    ('2008-01-01', '2008-02-01', '2008-03-01');
Go
 
/* Associate the partition function with a partition scheme. */
Create Partition Scheme test_monthlyDateRange_ps 
    As Partition test_monthlyDateRange_pf 
    All To ([Primary]);
Go
 
/* Create your first partitioned table! 
   Make sure the data types match.  */
Create Table dbo.orders
(
      order_id  int Identity(1,1)   Not Null
    , orderDate smalldatetime       Not Null
 
    Constraint PK_orders Primary Key Clustered
    (
        orderDate
      , order_id
    )
) On test_monthlyDateRange_ps(orderDate);
Go
 
/* Create some records to play with. */
Insert Into dbo.orders
Select '2007-12-31' Union All
Select '2008-01-02' Union All
Select '2008-01-03' Union All
Select '2008-01-04' Union All
Select '2008-02-01' Union All
Select '2008-02-02' Union All
Select '2008-03-01' Union All
Select '2008-03-02';
 
/* The $partition function can be used to interrogate partition data.
   Let's use it to see where those records are physically located. */
Select $partition.test_monthlyDateRange_pf(orderDate) 
    As 'partition_number'
    , *
From dbo.orders;
 
/* By default, all new indexes are created on the partition.
   Let's create an aligned index */
Create NonClustered Index IX_orders_aligned
    On dbo.orders(order_id)
    On test_monthlyDateRange_ps(orderDate);
 
/* Now let's create an un-aligned index.
   We'll need to specify the filegroup. */
Create NonClustered Index IX_orders_nonaligned
    On dbo.orders(order_id)
    On [Primary]; -- can be any filegroup
 
/* Review your indexes */
Execute sp_helpindex orders;

--------------------------
-- Swap Out A Partition --
--------------------------
 
/* We need to drop our un-aligned index; otherwise we'll 
   get an error when we attempt to do the switch. */
Drop Index IX_orders_nonaligned On dbo.orders;
 
/* Create the table to hold the data you're swapping out.
   The table structures must match identically; however, 
   DO NOT partition this table. */
Create Table dbo.orders_stage_swapOut
(
      order_id  int             Not Null
    , orderDate smalldatetime   Not Null
 
    Constraint PK_orders_stage_swapOut Primary Key Clustered
    (
        orderDate
      , order_id
    )
) On [Primary];
Go
 
/* Create the table to hold the data you're swapping in.
   The table structures must match identically; however,
   DO NOT partition this table. */
Create Table dbo.orders_stage_swapIn
(
      order_id  int             Not Null
    , orderDate smalldatetime   Not Null
 
    Constraint PK_orders_stage_swapIn Primary Key Clustered
    (
        orderDate
      , order_id
    )
) On [Primary];
Go
 
/* Populate the table you're swapping in. */
Insert Into dbo.orders_stage_swapIn
Select -5, '2008-02-02' Union All
Select -4, '2008-02-03' Union All
Select -3, '2008-02-04' Union All
Select -2, '2008-02-05' Union All
Select -1, '2008-02-06';
 
/* Create any indexes on your table to match the 
   indexes on your partitioned table. */
Create NonClustered Index IX_orders_stage_swapIn
    On dbo.orders_stage_swapIn(order_id);
 
/* Add a check constraint for the 
   partition to be swapped in. 
   This step is required. */
Alter Table dbo.orders_stage_swapIn
With Check
Add Constraint orders_stage_swapIn_orderDateCK
	Check (orderDate >= '2008-02-01' 
		And orderDate < '2008-03-01');
Go
 
/* Swap out the old partition. */
Alter Table dbo.orders 
    Switch Partition 3 To dbo.orders_stage_swapOut;
Go
 
/* Swap in the new partition. */
Alter Table dbo.orders_stage_swapIn
    Switch To dbo.orders Partition 3;
Go
 
---------------------
-- Check your data --
---------------------
 
/* You should have 2 records in here. */
Select * From dbo.orders_stage_swapOut;
 
/* You should have 5 records here. */
Select * 
From dbo.orders
Where orderDate >= '2008-02-01' 
And orderDate < '2008-03-01';
 
/* There should be no records in this table. */
Select * From dbo.orders_stage_swapIn;
 
Select $partition.test_monthlyDateRange_pf(orderDate) 
    As 'partition_number'
    , *
From dbo.orders;
 
/* Clean-up time!
Drop Table dbo.orders
Drop Table dbo.orders_stage_swapOut
Drop Table dbo.orders_stage_swapIn
Drop Partition Scheme test_monthlyDateRange_ps
Drop Partition Function [test_monthlyDateRange_pf]
*/