SQLSaturday #58 Presentation

Last Friday I had the opportunity to present a track on Table and index partitioning at SQLSaturday #58 (yes, SQLSaturday on a Friday) in Minnesota.

I had a great time, met a lot of great people and found the entire experience very enjoyable; I want to present more.

I said I'd put my queries up on my blog; so here it is.

Script 1 which was here is how to create a very basic partition and add values to it and move it (create a folder on your c drive called: PartitionDB prior to starting

/**************************************
** Database Partitioning Script      **
** Eric Zierdt, W3i            **
** http://ericemployed.blogspot.com  **
** http://blog.w3i.com               **
**************************************/
USE master
GO
CREATE DATABASE PartitionDB ON 
PRIMARY(NAME = db_data, FILENAME = 'c:\PartitionDB\db.mdf' ,SIZE = 25MB)
, FILEGROUP FG1( NAME = FG1_data, FILENAME = 'c:\PartitionDB\FG1.ndf' ,SIZE = 25MB)
, FILEGROUP FG2( NAME = FG2_data, FILENAME = 'c:\PartitionDB\FG2.ndf', SIZE = 25MB)
, FILEGROUP FG3( NAME = FG3_data, FILENAME = 'c:\PartitionDB\FG3.ndf', SIZE = 25MB)
, FILEGROUP FG4( NAME = FG4_data, FILENAME = 'c:\PartitionDB\FG4.ndf', SIZE = 25MB)
, FILEGROUP FG5( NAME = FG5_data, FILENAME = 'c:\PartitionDB\FG5.ndf', SIZE = 25MB)
, FILEGROUP FGDefault( NAME = FGDefault_data, FILENAME = 'c:\PartitionDB\FGDefault.ndf', SIZE = 25MB)
LOG ON( NAME = db_log, FILENAME = 'c:\PartitionDB\log.ldf', SIZE = 1MB,FILEGROWTH = 100MB ) ;
GO
USE PartitionDB
GO

CREATE PARTITION FUNCTION EZ_PartitionFunction (INT) AS
RANGE RIGHT FOR VALUES (1000, 2000, 3000, 4000, 5000);

CREATE PARTITION SCHEME EZ_PartitionScheme AS 
PARTITION EZ_PartitionFunction TO([FGDefault],[FG1], [FG2], [FG3], [FG4], [FG5])
GO


CREATE TABLE EZ_PartionedTable
( ID int PRIMARY KEY, 
  Name VARCHAR(50)
)
ON EZ_PartitionScheme(ID)


INSERT INTO EZ_PartionedTable (ID,NAME)
VALUES (1,'Test')
,(1001,'Test')
,(2001,'Test')
,(3001,'Test')
,(4001,'Test')
,(5001,'Test')
,(6001,'Test')
,(7001,'Test')
,(8001,'Test')

USE [master]
GO
ALTER DATABASE [PartitionDB] ADD FILEGROUP [FG6]
GO
ALTER DATABASE [PartitionDB] ADD FILE ( NAME = N'FG6_data', FILENAME = N'C:\PartitionDB\FG6.ndf' , SIZE = 25MB , FILEGROWTH = 5MB ) 
TO FILEGROUP [FG6]
GO
USE PartitionDB
GO

-- Adding a new Scheme and Function
ALTER PARTITION SCHEME EZ_PartitionScheme NEXT USED [FG6]  

ALTER PARTITION FUNCTION EZ_PartitionFunction() SPLIT RANGE (6000)



-- Removing a Scheme and Function
ALTER PARTITION FUNCTION EZ_PartitionFunction() MERGE RANGE (6000)





-- Adding a new Scheme and Function
ALTER PARTITION SCHEME EZ_PartitionScheme NEXT USED [FG6]  

ALTER PARTITION FUNCTION EZ_PartitionFunction() SPLIT RANGE (6000)

-- Removing a Scheme and Function out of Sequence
ALTER PARTITION FUNCTION EZ_PartitionFunction ()MERGE RANGE (5000)


ALTER PARTITION SCHEME EZ_PartitionScheme NEXT USED [FG5]  

ALTER PARTITION FUNCTION EZ_PartitionFunction() SPLIT RANGE (5000)

USE master
GO

Note that the USE Master at the bottom is so that in the next script (which I had in different files/tabs) when you drop the DB, you don't have an error about someone being connected.

Script 2 was used to demonstrate large volume of data being merged and split and how quickly the data goes from one table to another when you use the ALTER TABLE - SWITCH. When I gave the presentation, I had a subfolder created previously that had a Database with 8 Million rows already created. This wont work over the blog, so you'll need to create the table and dump in the 8M rows yourself....So I'm taking out the part about dropping the table and attaching the other database.

/**************************************
** Database Partitioning Script      **
** Eric Zierdt, W3i       **
** http://ericemployed.blogspot.com  **
** http://blog.w3i.com               **
**************************************/

/*** DROP TABLE AND PARTITION ***/
USE PartitionDB
DROP TABLE EZ_PartionedTable
DROP PARTITION SCHEME EZ_PartitionScheme
DROP PARTITION FUNCTION EZ_PartitionFunction
ALTER DATABASE [PartitionDB]  REMOVE FILE [FG6_data]
GO
ALTER DATABASE [PartitionDB] REMOVE FILEGROUP [FG6]
GO

/*** CREATE NEW PARTITION FUNCTION BASED ON MILLION RECORDS ***/
CREATE PARTITION FUNCTION EZ_PartitionFunction (INT) AS
RANGE RIGHT FOR VALUES (1000000, 2000000, 3000000, 4000000, 5000000);

/*** CREATE NEW PARTITION SCHEME ***/
CREATE PARTITION SCHEME EZ_PartitionScheme AS 
PARTITION EZ_PartitionFunction TO([FGDefault],[FG1], [FG2], [FG3], [FG4], [FG5])
GO

/*** CREATE NEW TABLE ***/
CREATE TABLE EZ_PartionedTable
( ID int NOT NULL IDENTITY (1000000, 1), 
  Name VARCHAR(50)
)
ON EZ_PartitionScheme(ID)

/*** ADD PK TO TABLE ***/
ALTER TABLE dbo.EZ_PartionedTable ADD CONSTRAINT
 PK_EZ_PartionedTable PRIMARY KEY CLUSTERED 
 (
 ID
 ) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON EZ_PartitionScheme(ID)

GO

/*** LOAD 8 MILLION RECORDS...Go get some food, this will take a while... ***/
DECLARE @i INT = 1
WHILE @i <= 8000000
BEGIN
INSERT INTO EZ_PartionedTable (NAME)
VALUES ('Test')
SET @i += 1
END


/*** ADD A NEW FILEGROUP TO THE DATABASE ***/
USE [master]
GO
ALTER DATABASE [PartitionDB] ADD FILEGROUP [FG6]
GO
ALTER DATABASE [PartitionDB] ADD FILE ( NAME = N'FG6_data', FILENAME = N'C:\PartitionDB\FG6.ndf' , SIZE = 25MB , FILEGROWTH = 5MB ) 
TO FILEGROUP [FG6]
GO
USE PartitionDB
GO



/*** ADD A NEW FILEGROUP TO THE PARTITION ***/
ALTER PARTITION SCHEME EZ_PartitionScheme NEXT USED [FG6]  

ALTER PARTITION FUNCTION EZ_PartitionFunction() SPLIT RANGE (6000000)
--NOTE THE LOG WILL GROW SIGNIFIGANTLY (look in your data directory, the log will grow to around 1.2 GB)
--The point of this is to say, that you need to be careful when using SPLIT and MERGE..doing it to a an empty range is ok, but if the range has data, it's dangerous

/*** SHRINK LOG ***/
USE [PartitionDB]
GO
DBCC SHRINKFILE (N'db_log' , 1)
GO

/*** REMOVE FILEGROUP FROM THE PARTITION ***/
ALTER PARTITION FUNCTION EZ_PartitionFunction ()MERGE RANGE (6000000)

/*** SHRINK LOG ***/
USE [PartitionDB]
GO
DBCC SHRINKFILE (N'db_log' , 1)
GO

/*** SHRINK LOG ***/
USE [PartitionDB]
GO
DBCC SHRINKFILE (N'FG6_data' , 25)
GO

/*** CREATE STAGE TABLE FOR SWITCH ***/
CREATE TABLE EZ_PartionedTable_Stage
( ID int NOT NULL IDENTITY (1000000, 1), 
  Name VARCHAR(50)
)
ON EZ_PartitionScheme(ID)

ALTER TABLE dbo.EZ_PartionedTable_Stage ADD CONSTRAINT
 PK_EZ_PartionedTable_Stage PRIMARY KEY CLUSTERED 
 (
 ID
 ) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON EZ_PartitionScheme(ID)
GO

--SHOW View Table Partition Data and explain what SWITCH DOES
ALTER TABLE EZ_PartionedTable SWITCH PARTITION 6 TO EZ_PartionedTable_Stage PARTITION 6

ALTER TABLE EZ_PartionedTable_Stage SWITCH PARTITION 6 TO EZ_PartionedTable PARTITION 6

--SHOW Dropping of data and removing old file group.
ALTER TABLE EZ_PartionedTable SWITCH PARTITION 6 TO EZ_PartionedTable_Stage PARTITION 6
DROP TABLE EZ_PartionedTable_Stage

ALTER DATABASE [PartitionDB]  REMOVE FILE [FG6_data]
GO
ALTER DATABASE [PartitionDB] REMOVE FILEGROUP [FG6]
GO

/*** SHRINK LOG ***/
USE [PartitionDB]
GO
DBCC SHRINKFILE (N'FG5_data' , 25)
GO

USE master
GO

Script 3 is a real life example of how my company uses Partitioning. It uses a date based range; and shows the process we use to move and drop the oldest data:

/**************************************
** Database Partitioning Script      **
** Eric Zierdt, W3i       **
** http://ericemployed.blogspot.com  **
** http://blog.w3i.com               **
**************************************/

USE master
GO
ALTER DATABASE [PartitionDB] SET  SINGLE_USER WITH ROLLBACK IMMEDIATE
GO
USE [master]
GO
DROP DATABASE PartitionDB
GO

/*** CREATE DB WITH FILEGROUP NAMES THAT ARE DATE BASED - AUGUST, SEPTEMBER AND OCTOBER 2010 ***/
CREATE DATABASE PartitionDB ON 
PRIMARY(NAME = db_data, FILENAME = 'c:\PartitionDB\db.mdf' ,SIZE = 4MB)
, FILEGROUP TRANDTA_201008 ( NAME = TRANDTA_201008, FILENAME = 'c:\PartitionDB\TRANDTA_201008.ndf' ,SIZE = 25MB)
, FILEGROUP TRANDTA_201009( NAME = TRANDTA_201009, FILENAME = 'c:\PartitionDB\TRANDTA_201009.ndf', SIZE = 25MB)
, FILEGROUP TRANDTA_201010( NAME = TRANDTA_201010, FILENAME = 'c:\PartitionDB\TRANDTA_201010.ndf', SIZE = 25MB)
, FILEGROUP TRANDEFAULT( NAME = TRANDEFAULT_data, FILENAME = 'c:\PartitionDB\FGDefault.ndf', SIZE = 25MB)
LOG ON( NAME = db_log, FILENAME = 'c:\PartitionDB\log.ldf', SIZE = 1MB,FILEGROWTH = 100MB ) ;
GO
USE PartitionDB
GO

/*** MAKE A PARTITION FUNCTION WITH RANGES FOR 08,09,10 2010 ***/
CREATE PARTITION FUNCTION [EZ_PartitionFunction](DATETIME) AS RANGE RIGHT FOR VALUES (
 N'2010-08-01'
 , N'2010-09-01'
 , N'2010-10-01')
GO

/*** BIND THE SCHEME TO THE FUNCTION ***/
CREATE PARTITION SCHEME EZ_PartitionScheme AS 
PARTITION EZ_PartitionFunction TO( 
 [TRANDEFAULT]
 , [TRANDTA_201008]
 , [TRANDTA_201009]
 , [TRANDTA_201010])
GO

/*** CREATE A TABLE AND BIND IT TO THE PARTITION ***/
CREATE TABLE EZ_PartionedTable
( ID int,
  DateAdded DATETIME PRIMARY KEY,
  Name VARCHAR(50)
)
ON EZ_PartitionScheme(DateAdded)

/*** INSERT SOME DATA INTO THE NEW TABLE, 3 RECORDS PER MONTH ***/
INSERT INTO EZ_PartionedTable (ID,DateAdded, NAME)
VALUES (1,'08/01/2010', 'Test')
,(2,'08/10/2010','Test')
,(3,'08/31/2010','Test')
,(4,'09/01/2010','Test')
,(5,'09/15/2010','Test')
,(6,'09/30/2010 23:59:59','Test')
,(7,'10/01/2010','Test')
,(8,'10/07/2010','Test')
,(9,'10/22/2010','Test')



/*** On around the 25th of each month, we fire off an agent job that calls a 
proc that makes a new month filegroup, file, function and scheme ***/
USE [master]
GO
ALTER DATABASE [PartitionDB] ADD FILEGROUP [TRANDTA_201011]
GO
ALTER DATABASE [PartitionDB] ADD FILE ( NAME = N'TRANDTA_201011', FILENAME = N'C:\PartitionDB\TRANDTA_201011.ndf' , SIZE = 25MB , FILEGROWTH = 5MB ) 
 TO FILEGROUP [TRANDTA_201011]
GO
USE PartitionDB
GO

ALTER PARTITION SCHEME EZ_PartitionScheme NEXT USED [TRANDTA_201011]  

ALTER PARTITION FUNCTION EZ_PartitionFunction() SPLIT RANGE ('11/01/2010')


/*** INSERT A RECORD FOR OCTOBER AND CHECK THE VIEW PARTITION SCRIPT ***/
INSERT INTO EZ_PartionedTable (ID,DateAdded, NAME)
VALUES (1,'10/31/2010', 'Test')

/*** INSERT A RECORD FOR NOVEMBER AND CHECK THE VIEW PARTITION SCRIPT ***/
INSERT INTO EZ_PartionedTable (ID,DateAdded, NAME)
VALUES (2,'11/01/2010', 'Test')


/*** Within the first few days of the month we verify that the partitions are correct, then we run a proc that does this: ***/
-- MAKE A STAGING TABLE THAT IS EXACTLY THE SAME AS THE MAIN TABLE
CREATE TABLE EZ_PartionedTable_Stage
( ID int,
  DateAdded DATETIME PRIMARY KEY,
  Name VARCHAR(50)
)
ON EZ_PartitionScheme(DateAdded)

/*** SWITCH OUT THE OLDEST MONTH'S PARTITION DATA TO THE STAGING TABLE ***/
ALTER TABLE EZ_PartionedTable SWITCH PARTITION 2 TO EZ_PartionedTable_Stage PARTITION 2

/**** BCP OUT DATA (NOT SHOWN HERE) ****/

/*** DROP STAGING DATA (AND ALL THE DATA FROM THE OLDEST MONTH WITH IT) ***/
DROP TABLE EZ_PartionedTable_Stage

/*** DROP THE FUNCTION RANGE FOR THE OLDEST MONTH ***/
ALTER PARTITION FUNCTION EZ_PartitionFunction() MERGE RANGE ('8/01/2010')
GO
/*** DROP THE FILEGROUP AND FILE FOR THE OLDEST MONTH ***/
ALTER DATABASE [PartitionDB]  REMOVE FILE [TRANDTA_201008]
GO
ALTER DATABASE [PartitionDB] REMOVE FILEGROUP [TRANDTA_201008]
GO


--DMV's that are useful:

SELECT * 
FROM sys.partition_functions

SELECT * 
FROM sys.partition_schemes
-- Joins to Function on function_id

SELECT * 
FROM sys.partition_range_values
-- Joins to Function on function_id

SELECT * 
FROM sys.indexes
-- Joins to schemes on data_space_id

SELECT * 
FROM sys.data_spaces
-- Joins to indexes on data_space_id

SELECT * 
FROM sys.filegroups
-- Joins to indexes on data_space_id

The final script was a script to show how many records are in each filegroup/range; I find it is very useful for me for many different situations.

/**************************************
** Database Partitioning Script      **
** Eric Zierdt, W3i       **
** http://ericemployed.blogspot.com  **
** http://blog.w3i.com               **
**************************************/

USE PartitionDB
DECLARE @TableName VARCHAR(150) = '%%'
  ,@FileGroup VARCHAR(150) = '%%'

SELECT OBJECT_NAME(p.object_id) AS TableName,
  i.name AS IndexName,
  p.partition_number AS PartitionNumber,
  fg.name AS FileGroupName,
  prv_left.value AS LowerBoundaryValue,
  prv_right.value AS UpperBoundaryValue,
  p.rows AS Rows
FROM sys.partitions AS p
JOIN sys.indexes AS i ON i.object_id = p.object_id AND i.index_id = p.index_id
JOIN sys.data_spaces AS ds ON ds.data_space_id = i.data_space_id
JOIN sys.partition_schemes AS ps ON ps.data_space_id = ds.data_space_id
JOIN sys.partition_functions AS pf ON pf.function_id = ps.function_id
JOIN sys.destination_data_spaces AS dds2 ON dds2.partition_scheme_id = ps.data_space_id AND dds2.destination_id = p.partition_number
JOIN sys.filegroups AS fg ON fg.data_space_id = dds2.data_space_id
LEFT JOIN sys.partition_range_values AS prv_left ON ps.function_id = prv_left.function_id AND prv_left.boundary_id = p.partition_number - 1
LEFT JOIN sys.partition_range_values AS prv_right ON ps.function_id = prv_right.function_id AND prv_right.boundary_id = p.partition_number 
WHERE OBJECTPROPERTY(p.object_id, 'ISMSShipped') = 0 
  AND OBJECT_NAME(p.object_id) LIKE @TableName
  AND fg.name LIKE @FileGroup
ORDER BY TableName, IndexName, PartitionNumber;

USE master