Table Partitioning Implementation with advanced scenarios (Part 2)

Points covered in the last post :

• What is table partitioning?
• Why we need to use table partitioning?
• PROS and CONS of table partitioning?
• Partitioned Table Rules and Gotchas
• What is difference Table partitioning Type in SQL Server?

before going to the Technical demo we should know what is table partitioning dependence

PARTITION FUNCTION:

that maps the rows of a table or index into partitions based on the boundary_value , we can build the Partition Function by two ways based on our Requirement and our business needed

• RANGE RIGHT
• RANGE LEFT

another thing the boundary_value we can do it on three data type

• INT COLUMN
• DATETIME COLUMN
• CHAR COLUMN

PARTITION SCHEME:

that maps the partitions of a partitioned table or index to filegroups , partition scheme must be created on partition function , partition scheme can be used for one or more partitioned tables, indexes, and indexed views.

PARTITION TABLE/INDEX:

is tied to a particular partition scheme when it is created , partition table has only an indirect relationship, through the partition scheme, to the partition function at the end The relationship between a partition function and a partition scheme is one-to-many as is the relationship between a partition scheme and partitioned tables and indexes , because moving data in and out of a partitioned table usually requires modifying the partition function for more information :

• Partitioned Tables and Indexes in SQL Server 2005 at http://msdn.microsoft.com/en-us/library/ms345146.aspx
• Strategies for Partitioning Relational Data Warehouses in Microsoft SQL Server athttp://technet.microsoft.com/en-us/library/cc966457.aspx

let’s go now for the TECHNICAL DEMO to know How we can implement the table partitioning step by step from Scratch

How to Implement Partitioned Tables 

to implement any partitioned table from SCRATCH we have basic 6 steps we will do it now by T-SQLand by SQL SERVER WIZARD

• Create Database (T-SQL / Wizard)
• Create FILEGROUP (T-SQL / Wizard)
• Create files and add it to the FILEGROUP (T-SQL / Wizard)
• Create partition Function (RANGE RIGHT / RANGE LEFT) (T-SQL only)
• Create partition Scheme (T-SQL only)
• Create Table Partitioning (T-SQL only)

at the first i will do it by T-SQL

• Create database 

I will create new database [DBForPartitioning] to be for all our workshop to the end of the series

CREATE DATABASE [DBForPartitioning]

GO

ALTER DATABASE [DBForPartitioning]

MODIFY FILE ( NAME = N'DBForPartitioning', SIZE = 256MB , MAXSIZE = 10GB , FILEGROWTH = 512MB );

ALTER DATABASE [DBForPartitioning]

MODIFY FILE ( NAME = N'DBForPartitioning_log', SIZE = 128MB , FILEGROWTH = 128MB );

GO

• Create FILEGROUP

here we will create four filegroup (FG1 ,FG2 , FG3 , FG4) to can use it on the Partition Scheme

USE [master]

GO

ALTER DATABASE [DBForPartitioning] ADD FILEGROUP [FG1]

ALTER DATABASE [DBForPartitioning] ADD FILEGROUP [FG2]

ALTER DATABASE [DBForPartitioning] ADD FILEGROUP [FG3]

ALTER DATABASE [DBForPartitioning] ADD FILEGROUP [FG4]

GO

• Create / Add files to filegroup

in this step i will create four files and add it on the FILEGROUP and all of this i will do it dynamically

Use DBForPartitioning

Go

DECLARE @path NVARCHAR(256) ,

@i TINYINT= 1 ,

@sql NVARCHAR(4000);

SELECT TOP 1

@path = LEFT(physical_name, LEN(physical_name) - 4)

FROM sys.database_files

WHERE name = 'DBForPartitioning'

WHILE @i <= 4

BEGIN

SET @sql = N'ALTER DATABASE DBForPartitioning ADD FILE (name=File' + CAST(@i ASNCHAR(1)) + ',

filename=''' + @path + N'File' + CAST(@i AS NCHAR(1)) + '.ndf' + ''',

size=128MB, filegrowth=256MB) TO FILEGROUP FG' + CAST(@i AS NCHAR(1))

RAISERROR (@sql,0,0)

EXEC sp_executesql @sql;

SET @i += 1;

END

GO

Range Direction Right and Datetime Boundary Values

Next three steps i will do every thing on the RANGE RIGHT and RANGE LEFT so i will work on parallel

• Create partitioning function

in this case i will do partition function with boundary_value DATETIME and

Use DBForPartitioning

GO

CREATE PARTITION FUNCTION PF_DBForPartitioning_RangeRight (datetime)

AS RANGE RIGHT FOR VALUES ( '2008-01-01','2009-01-01', '2010-01-01');

• Create Partition Scheme

i will create Partition scheme on PF(PF_DBForPartitioning_RangeRight) on the four filegroup

</pre>

Use DBForPartitioning

GO

CREATE PARTITION SCHEME PS_DBForPartitioning_RangeRight

AS PARTITION PF_DBForPartitioning_RangeRight

TO (FG1, FG2, FG3 ,FG4)

GO

<pre>

• Create Table partitioning

now i will create table Partitioning on Partitioning Scheme [PS_DBForPartitioning_RangeRight] on datetime Column

Use DBFOrPartitioning

GO

CREATE TABLE Partitioning_RangeRight

(Partitioning_ID int ,

Partitioning_time datetime)

ON PS_DBForPartitioning_RangeRight (Partitioning_time);

GO

Now the 6 basic steps for any table partitioning is finished and i will go now for fill the table by some test data then i will show some wonderful Stored Procedures and Scripts it will return to us all the information about the Partition Function ,Partition Scheme and table Partition , ….etc

• Fill the data in the table 

</pre>

Use DBFOrPartitioning

GO

INSERT INTO Partitioning_RangeRight (Partitioning_ID, Partitioning_time)

SELECT 1 ,'2007-01-01'UNION ALL

SELECT 2 ,'2007-10-01'UNION ALL

SELECT 3 ,'2008-01-01'UNION ALL

SELECT 4 ,'2008-08-09'UNION ALL

SELECT 5 ,'2008-12-30'UNION ALL

SELECT 6 ,'2009-01-01'UNION ALL

SELECT 7 ,'2009-05-24'UNION ALL

SELECT 8 ,'2010-01-24'UNION ALL

SELECT 9 ,'2010-05-24'UNION ALL

SELECT 10,'2011-05-24'

GO

<pre>

Return Partition Information by T-SQL Scripts

• Select table Partitioned in DB

Use DBFOrPartitioning

GO

select distinct t.name

from sys.partitions p

inner join sys.tables t

on p.object_id = t.object_id

where p.partition_number <> 1

• Stored procedure to Return the Partitioned Columns

Exec partitioning_Column ‘Partitioning_RangeRight’

Create Proc partitioning_Column (@Table_Name Nvarchar(500))

AS

Begin

SELECT CAST(ic.partition_ordinal AS INT) AS [ID],

c.name AS ColumnName

FROM sys.tables AS tbl

INNER JOIN sys.indexes AS idx

ON idx.object_id = tbl.object_id

AND idx.index_id < 2

INNER JOIN sys.index_columns ic

ON (ic.partition_ordinal > 0)

AND (ic.index_id = idx.index_id

AND ic.object_id = CAST(tbl.object_id AS INT))

INNER JOIN sys.columns c

ON c.object_id = ic.object_id

AND c.column_id = ic.column_id

WHERE (tbl.name = @Table_Name

AND SCHEMA_NAME(tbl.schema_id) = 'dbo')

ORDER BY [ID]

END

• Select Partition_id with Partition_number

select partition_id, index_id, partition_number, Rows

FROM sys.partitions

WHERE OBJECT_NAME(OBJECT_ID)='Partitioning_RangeRight'

GO

• Select the PartitionFunction and PartitionScheme Name

select ps.Name PartitionScheme, pf.name PartitionFunction

from sys.indexes i

join sys.partition_schemes ps on ps.data_space_id = i.data_space_id

join sys.partition_functions pf on pf.function_id = ps.function_id

where i.object_id = object_id('Partitioning_RangeRight')

• Stored procedure to return all the detail about table Partitioned and the data exist on it

Create proc PartitionTableDetail(@tablename Nvarchar(500))

As

begin

SELECT

ISNULL(quotename(ix.name),'Heap') as IndexName

,ix.type_desc as type

,prt.partition_number

,prt.data_compression_desc

,ps.name as PartitionScheme

,pf.name as PartitionFunction

,fg.name as FilegroupName

,case when ix.index_id < 2 then prt.rows else 0 END as Rows

,au.TotalMB

,au.UsedMB

,case when pf.boundary_value_on_right = 1 then 'less than' whenpf.boundary_value_on_right is null then '' else 'less than or equal to' End asComparison

,fg.name as FileGroup

,rv.value As Rang_value,

T.name AS Range_Type

FROM sys.partitions prt

inner join sys.indexes ix

on ix.object_id = prt.object_id and

ix.index_id = prt.index_id

inner join sys.data_spaces ds

on ds.data_space_id = ix.data_space_id

left join sys.partition_schemes ps

on ps.data_space_id = ix.data_space_id

left join sys.partition_functions pf

on pf.function_id = ps.function_id

inner join sys.partition_parameters PP

on pf.function_id = PP.function_id

inner join sys.types t

on t.system_type_id = PP.system_type_id

left join sys.partition_range_values rv

on rv.function_id = pf.function_id AND

rv.boundary_id = prt.partition_number

left join sys.destination_data_spaces dds

on dds.partition_scheme_id = ps.data_space_id AND

dds.destination_id = prt.partition_number

left join sys.filegroups fg

on fg.data_space_id = ISNULL(dds.data_space_id,ix.data_space_id)

inner join (select str(sum(total_pages)*8./1024,10,2) as [TotalMB]

,str(sum(used_pages)*8./1024,10,2) as [UsedMB]

,container_id

from sys.allocation_units

group by container_id) au

on au.container_id = prt.partition_id

WHERE prt.OBJECT_ID = object_id(@tablename)

order by ix.type_desc;

END

Exec PartitionTableDetail 'Partitioning_RangeRight'

this not the end still i have lot of Scripts it will help any DBA to know what he need about Partitioning table in any Environment without much effort and without time only 5 SEC he can know every thing next post i will explain the below point

• Range Direction left and Datetime Boundary Values
• Table partitioning by SQL Server wizard
• new Scripts for investigation