SQL Server: Populate (Minute) Date Dimension table - sql

Question

I'm working on a script to populate a very simple date dimension table whose granularity is down to the minute level. This table should ultimately contain a smalldatetime representing every minute from 1/1/2000 to 12/31/2015 23:59.
Here is the definition for the table:
CREATE TABLE [dbo].[REF_MinuteDimension] (
[TimeStamp] SMALLDATETIME NOT NULL,
CONSTRAINT [PK_REF_MinuteDimension] PRIMARY KEY CLUSTERED ([TimeStamp] ASC) WITH (FILLFACTOR = 100)
);
Here is the latest revision of the script:
DECLARE #CurrentTimeStamp AS SMALLDATETIME;
SELECT TOP(1) #CurrentTimeStamp = MAX([TimeStamp]) FROM [dbo].[REF_MinuteDimension];
IF #CurrentTimeStamp IS NOT NULL
SET #CurrentTimeStamp = DATEADD(MINUTE, 1, #CurrentTimeStamp);
ELSE
SET #CurrentTimeStamp = '1/1/2000 00:00';
ALTER TABLE [dbo].[REF_MinuteDimension] DROP CONSTRAINT [PK_REF_MinuteDimension];
WHILE #CurrentTimeStamp < '12/31/2050 23:59'
BEGIN
;WITH DateIndex ([TimeStamp]) AS
(
SELECT #CurrentTimeStamp
UNION ALL
SELECT DATEADD(MINUTE, 1, [TimeStamp]) FROM DateIndex di WHERE di.[TimeStamp] < dbo.fGetYearEnd(#CurrentTimeStamp)
)
INSERT INTO [dbo].[REF_MinuteDimension] ([TimeStamp])
SELECT di.[TimeStamp] FROM DateIndex di
OPTION (MAXRECURSION 0);
SET #CurrentTimeStamp = DATEADD(YEAR, 1, dbo.fGetYearBegin(#CurrentTimeStamp))
END
ALTER TABLE [dbo].[REF_MinuteDimension] ADD CONSTRAINT [PK_REF_MinuteDimension] PRIMARY KEY CLUSTERED ([TimeStamp] ASC) WITH (FILLFACTOR = 100);
A couple of things to point out:
I've added logic to drop and subsequently re-add the primary key constraint on the table, hoping to boost the performance.
I've added logic to chunk the INSERTS into yearly batches to minimize the impact on the transaction log. On a side note, we're using the SIMPLE recovery model.
Performance is so-so and takes around 15-20 minutes to complete. Any hints/suggestions on how this script could be "tuned up" or improved?
Also, for completeness here are fGetYearBegin and fGetYearEnd:
CREATE FUNCTION dbo.fGetYearBegin
(
#dtConvertDate datetime
)
RETURNS smalldatetime
AS
BEGIN
RETURN DATEADD(YEAR, DATEDIFF(YEAR, 0, #dtConvertDate), 0)
END
CREATE FUNCTION dbo.fGetYearEnd
(
#dtConvertDate datetime
)
RETURNS smalldatetime
AS
BEGIN
RETURN DATEADD(MINUTE, -1, DATEADD(YEAR, 1, dbo.fGetYearBegin(#dtConvertDate)))
END

Answer 1

This takes 11 seconds on my server...
If Object_ID('tempdb..#someNumbers') Is Not Null Drop Table #someNumbers;
Create Table #someNumbers (id Int);
Declare #minutes Int,
#days Int;
Select #minutes = DateDiff(Minute,'1/1/2000 00:00','1/2/2000 00:00'),
#days = DateDiff(Day,'1/1/2000 00:00','1/1/2051 00:00');
With Base As
(
Select 1 As seedID
Union All
Select 1
), Build As
(
Select seedID
From Base
Union All
Select b.seedID + 1
From Build b
Cross Join Base b2
Where b.SeedID < 14
)
Insert #someNumbers
Select Row_Number() Over (Order By seedID) As id
From Build
Option (MaxRecursion 0);
If Object_ID('tempdb..#values') Is Not Null Drop Table #values;
Create Table #values ([TimeStamp] SmallDateTime NOT NULL);
With Dates As
(
Select DateAdd(Day,id-1,'1/1/2000 00:00') As [TimeStamp]
From #someNumbers
Where id <= #days
)
Insert #values
Select Convert(SmallDateTime,DateAdd(Minute,id-1,[TimeStamp]))
From Dates d
Join #someNumbers sn
On sn.id <= #minutes
Order By 1