Partition SQL table on monthly basis - sql-server

Question

I need to partition SQL table on monthly basis. So far i am able to create 12 partitions in Year-2015. But when year 2016 starts, all data started to pile up in last partition (December in my case). I need to place data of January-2016 in 1 partition (January in my case). I cannot make partitions for every year. Any suggestions?

Answer 1

Below is an example of how to create an incremental monthly partition for a RANGE RIGHT function, including test data.
CREATE DATABASE Test;
GO
USE Test
GO
--main table partition function (before start of next month)
CREATE PARTITION FUNCTION PF_Monthly(datetime2(0))
AS RANGE RIGHT FOR VALUES (
'2015-01-01T00:00:00'
, '2015-02-01T00:00:00'
, '2015-03-01T00:00:00'
, '2015-04-01T00:00:00'
, '2015-05-01T00:00:00'
, '2015-06-01T00:00:00'
, '2015-07-01T00:00:00'
, '2015-08-01T00:00:00'
, '2015-09-01T00:00:00'
, '2015-10-01T00:00:00'
, '2015-11-01T00:00:00'
, '2015-12-01T00:00:00'
, '2016-01-01T00:00:00' --future empty partition
)
GO
--main table partition scheme
CREATE PARTITION SCHEME PS_Monthly
AS PARTITION PF_Monthly
ALL TO ( [PRIMARY] );
GO
--main partitioned table
CREATE TABLE dbo.MontylyPartitionedTable(
PartitioningColumn datetime2(0)
, OtherKeyColumn int NOT NULL
, OtherData int NULL
, CONSTRAINT PK_MontylyPartitionedTable PRIMARY KEY
CLUSTERED (PartitioningColumn, OtherKeyColumn)
ON PS_Monthly(PartitioningColumn)
) ON PS_Monthly(PartitioningColumn);
GO
---load 12M rows test data
WITH
t4 AS (SELECT n FROM (VALUES(0),(0),(0),(0)) t(n))
,t256 AS (SELECT 0 AS n FROM t4 AS a CROSS JOIN t4 AS b CROSS JOIN t4 AS c CROSS JOIN t4 AS d)
,t16M AS (SELECT ROW_NUMBER() OVER (ORDER BY (a.n)) - 1 AS num FROM t256 AS a CROSS JOIN t256 AS b CROSS JOIN t256 AS c)
INSERT INTO dbo.MontylyPartitionedTable WITH (TABLOCKX) (PartitioningColumn, OtherKeyColumn, OtherData)
SELECT DATEADD(month, num/1000000, '20150101'), num, num
FROM t16M
WHERE num < 12000000;
GO
CREATE PROCEDURE dbo.CreateMonthlyPartition
#NewMonthStartDate datetime2(0) --partition boundary to create
/*
*/
AS
SET XACT_ABORT ON;
BEGIN TRY
BEGIN TRAN;
--acquire exclusive lock on main table to prevent deadlocking during partition maintenance
DECLARE #result int = (SELECT TOP (0) 1 FROM dbo.MontylyPartitionedTable WITH (TABLOCKX));
--add new partition for future data
ALTER PARTITION SCHEME PS_Monthly
NEXT USED [PRIMARY];
ALTER PARTITION FUNCTION PF_Monthly()
SPLIT RANGE (#NewMonthStartDate);
--this will release the exclusve table lock but the data in the staging table temporarily unavailable
COMMIT;
END TRY
BEGIN CATCH
IF ##TRANCOUNT > 0 ROLLBACK;
THROW;
END CATCH;
GO
--schedule this before the start of each new month to create a new monthly partition 2 months in advance
SELECT DATEADD(day, 1, DATEADD(month, 1, EOMONTH(GETDATE())));
DECLARE #NewMonthStartDate datetime2(0) = DATEADD(day, 1, DATEADD(month, 1, EOMONTH(GETDATE())));
EXEC dbo.CreateMonthlyPartition #NewMonthStartDate;
GO

Answer 2

Partition Table Monthly Bases using Computed Column.
**step1 : Create FileGroup For 12 Month **
ALTER DATABASE yourDataBase ADD FILEGROUP January
ALTER DATABASE yourDataBase ADD FILE (
NAME = N'January',
FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL12.MSSQLSERVER\MSSQL\DATA\January.ndf'
) TO FILEGROUP January
ALTER DATABASE yourDataBase ADD FILEGROUP February
ALTER DATABASE yourDataBase ADD FILE (
NAME = N'February',
FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL12.MSSQLSERVER\MSSQL\DATA\February.ndf',
SIZE = 3072KB , FILEGROWTH = 1024KB
) TO FILEGROUP February
and so on Until 12 Month.
step2 : Create Function
CREATE PARTITION FUNCTION partition_ByMonth (int) AS RANGE RIGHT FOR VALUES (2,3,4,5,6,7,8,9,10,11,12);
step3: Create SCheme
CREATE PARTITION SCHEME partition_scheme_ByMonth
AS PARTITION partition_ByMonth
TO (January, February, March, April, May, June, July, August, September, October, November, December);
step4: Table Partition
ALTER TABLE PartitionTableByMonth ADD PartitionColumn as MONTH(OrderDate) PERSISTED
step5: index
CREATE NONCLUSTERED INDEX IX_PartitionedTable_Pd ON PartitionTableByMonth (PartitionColumn )
ON partition_scheme_ByMonth(PartitionColumn )
Now yourTable Partitioning By month