SQL Server Compression Estimation Presented by Warwick Rudd – warwick.rudd@wardyit.com

SQL Server Compression Estimation

Presented by Warwick Rudd – warwick.rudd@wardyit.com

About Warwick Rudd

• SQL Server Consultant WARDY IT Solutions – Email: warwick.rudd@wardyit.com

• Microsoft Certified IT Professional – SQL 2008 Admin (MCITP SQL 2008 Admin)

• Microsoft Certified Trainer (MCT)• WARDY IT Solutions

– Australia’s leading SQL Server specialists– Deloitte Technology Fast 500 Asia Pacific 2010 Winner

Contents

• History of Compression• SQL Server Database Compression• SQL Server Backup Compression• Compression Estimation Tool

What is Compression ?

The reduction in size of data to save space or processing time.

History of Compression

• SQL Server 2005 SP2– New Data type - VarDecimal

• SQL Server 2008 – Database & Backup compression

• SQL Server 2008 R2– Unicode data compression

Database Compression MatrixSQL Server 2005 SP2

SQL Server 2008

SQL Server 2008 R2

Edition Enterprise Enterprise Enterprise & Data Center

Compression Type

VarDecimal Row Level Page Level Unicode

Database Compression Cost Benefit Analysis

Benefits CostPerformance improvements Increased CPU utilisation

• More data in memory

• Reduced I/O

Reduced disk space usage

• Database data files

• Backup files

Reduced time to backup

Cost Savings

Database Compression Estimation

• SQL Server 2005 SP2– Sys.sp_estimated_rowsize_reduction_for_vardecimal

• SQL Server 2008 & R2– Sp_estimate_data_compression_savings

Enabling Database Compression

• SQL Server 2005 SP2– Enable database for Vardecimal Storage format

• Sp_db_vardecimal_storage_format

– Enabling table for Vardecimal Storage format• Sp_tableoption

• SQL Server 2008 & R2– Alter Table [TableName] Rebuild with (Data_compression =

Compression Type)• Compression Types

– Row– Page– None

Enabling Database Compression

– Alter Table [TableName] Rebuild Partition = All with (Data_compression = Compression Type on Partitions (x to n))

• Compression Types– Row– Page– None

– Alter Index [IndexName] on [TableName] Rebuild with (Data_compression = Compression Type)

• Compression Types– Row– Page– None

Things to consider

• Data types not able to be compressed– XML– BLOB– MAX Datatypes

• Tables not eligible for compression– Maximum row size + compression overhead >

8060 bytes

Things to consider

• Compression with partitions– Splitting a range– Merging a range– Switching partitions

SQL Server Database Compression Demo

Backup Compression MatrixSQL Server 2005 SP2

SQL Server 2008

SQL Server 2008 R2

EditionStandard Enterprise Datacenter

Backup Compression Cost Benefit Analysis

Benefits CostPerformance improvements Increased CPU utilisation

• Reduced I/O

Reduced disk space usage

Reduced time to backup

Cost Savings

Enabling Backup Compression

• Instance level– SSMS– Transact SQL

• Defaults can be overidden– Transaction Log Shipping– Maintenance Plans– SSMS– Transact SQL

SQL Server Backup Compression Demo

Compression Estimation Tool

• Available from Codeplex– http://ssce.codeplex.com/

Compression Estimation Tool Demo

Thanks for listening

Warwick.rudd@wardyit.com0403 144 302http://www.wardyit.comhttp://www.wardyit.com/blog

Other Resources

• http://blogs.msdn.com/b/sqlserverstorageengine/archive/tags/data+compression/

• http://msdn.microsoft.com/en-us/library/dd894051(v=sql.100).aspx#_Appendix_C:_Script

• http://msdn.microsoft.com/en-us/library/cc280576.aspx• http://msdn.microsoft.com/en-us/library/cc280464.aspx