3. OUTLINE
• introduction to change data capture + demo
• control flow tasks+ demo
• data flow components+ demo
• Oracle as a source
• conclusion
4. INTRODUCTION
• change data capture (CDC)
• designed to capture insert/update/delete data
o make it available in “easily consumed” relational format
o pretty much DIY in TSQL
• introduced in SQL Server 2008
o technically hasn’t changed in SQL Server 2012
• alternative for change tracking
• typically used in data warehouse scenarios
o speed up extraction by incremental loads
• why?
• more data everyday
• less time to process it
o full load vs. incremental load
5. INTRODUCTION
• CDC versus change tracking
CDC change tracking
which changes? insert/update/delete insert/update/delete
shows type of DML? yes yes
methodology? asynchronous synchronous
column changed? yes yes
historical data? yes no
editions? Enterprise only all
7. OUTLINE
• introduction to change data capture + demo
• control flow tasks+ demo
• data flow components+ demo
• Oracle as a source
• conclusion
8. CONTROL FLOW TASKS
• CDC control task
• controls lifecycle of CDC packages
o handles initial load synchronization
o management of LSN ranges
o error scenarios and recovery
• stores state in SSIS variable and
in database table
• two operations
o initial load
o incremental load
11. OUTLINE
• introduction to change data capture + demo
• control flow tasks+ demo
• data flow components+ demo
• Oracle as a source
• conclusion
12. DATA FLOW COMPONENTS
• CDC source
• reads a range of change data
• all / net changes
o and everything in between
13. DATA FLOW COMPONENTS
• CDC splitter
• basically a conditional split on steroids
o … but without a GUI
• splits flow of changed data into
inserts, updates and deletes
• do not combine with ALL CDC processing mode
o order between operations is lost
15. DATA FLOW COMPONENTS
• incremental load package
• remember to run it twice…
• use the __$reprocessing column to identify rows in need of attention
16. OUTLINE
• introduction to change data capture + demo
• control flow tasks+ demo
• data flow components+ demo
• Oracle as a source
• conclusion
17. ORACLE AS A SOURCE
• Oracle CDC components by Attunity
• not installed by default
• can be found on installation media /Tools/AttunityCDCOracle
CDC Designer
CDC Service mirror cdc
log miner
figure modeled after slide of Matt Masson [16]
18. ORACLE AS A SOURCE
• Oracle CDC Service
• prepare SQL Server
o creates MSXDBCDC database + objects
• local system account
o logon as a policy permission
• CDC service master password
o used to encrypt Oracle credentials
• one service per Oracle DB
19. ORACLE AS A SOURCE
• Oracle CDC Designer
• create and manage CDC instances
o multiple instances per service possible
• contains
o Oracle DB info
o tables and columns being tracked
o mirroring info
20. OUTLINE
• introduction to change data capture + demo
• control flow tasks+ demo
• data flow components+ demo
• Oracle as a source
• conclusion
21. CONCLUSION
• no new technical enhancements
• enhancements are on manageability level
• provided by Attunity
• new SSIS tasks/components
• CDC control task
• CDC source
• CDC splitter
• two types of packages
• initial load
• incremental load
• remember the __$reprocessing column
• possible to use Oracle as CDC source
• CDC service & designer
22. RESOURCES
• CDC 2008 & Change Tracking
• [1] MSDN - Change Data Capture
http://msdn.microsoft.com/en-us/library/bb522489(v=sql.105).aspx
• [2] MSDN - Comparing Change Data Capture and Change Tracking
http://msdn.microsoft.com/en-us/library/cc280519(v=sql.105).aspx
• [3] Kendra Little - Change Data Capture vs Change Tracking
http://www.littlekendra.com/2010/06/23/cdcvsct/
• CDC & SSIS 2012
• [4] MSDN - CDC Control Task
http://msdn.microsoft.com/en-us/library/hh758674.aspx
• [5] MSDN - CDC Source
http://msdn.microsoft.com/en-us/library/hh758686.aspx
• [6] MSDN - CDC Splitter
http://msdn.microsoft.com/en-us/library/hh758656.aspx
• [7] MSDN - CDC Flow Components
http://msdn.microsoft.com/en-us/library/hh231087.aspx
• [8] MSDN - Define a State Variable
http://msdn.microsoft.com/en-us/library/hh758667
• [9] Allan Mitchell - SSIS CDC Processing Mode Not Updating Flag Attributes
http://copperblueblog.com/2012/06/06/ssis-cdc-processing-mode-not-updating-flag-attributes/
23. RESOURCES
• CDC & SSIS 2012 (continued)
• [10] Allan Mitchell - CDC Package Needs Executing Twice
http://copperblueblog.com/2012/06/06/ssis-change-data-capture-cdc-package-needs-executing-twice/
• [11] Allan Mitchell - Changes Made To Source During Full Load
http://copperblueblog.com/2012/06/07/ssis-cdc-changes-made-to-source-during-full-load/
• [12] Allan Mitchell - Batch Sizes, Fast Load, Commit Size And The OLE
DB Destination
http://copperblueblog.com/2012/10/02/batch-sizes-fast-load-commit-size-and-the-ole-db-destination/
• [13] Matt Masson - CDC in SSIS for SQL Server 2012
http://www.mattmasson.com/index.php/2011/12/cdc-in-ssis-for-sql-server-2012-2/
• [14] Matt Masson - CDC Control Task Operations
http://www.mattmasson.com/index.php/2012/02/cdc-control-task-operations/
• [15] Matt Masson - Processing Modes for the CDC Source
http://www.mattmasson.com/index.php/2012/01/processing-modes-for-the-cdc-source/
• [16] Channel9 - TechEd North America (Matt Masson) - Incremental ETL Using CDC
for SQL and Oracle with SQL Server Integration Services (SSIS) 2012
http://channel9.msdn.com/Events/TechEd/NorthAmerica/2012/DBI322
24. RESOURCES
• CDC & Oracle
• [17] TechNet Wiki - Installing Microsoft SQL Server 2012 Change Data Capture
for Oracle by Attunity
http://social.technet.microsoft.com/wiki/contents/articles/7647.installing-microsoft-sql-server-
2012-change-data-capture-for-oracle-by-attunity.aspx
• [18] SSIS blog MSDN - CDC for Oracle in SQL Server 2012
http://blogs.msdn.com/b/mattm/archive/2012/03/26/cdc-for-oracle-in-sql-server-2012.aspx
• [19] SSIS blog MSDN - Video about CDC for Oracle Databases in SSIS 2012
http://blogs.msdn.com/b/mattm/archive/2012/07/10/video-about-cdc-for-oracle-databases-in-
ssis-2012.aspx
