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Required Slide. SESSION CODE: DAT318. Auditing, Tracking, and Change Monitoring Technologies in Microsoft SQL Server 2008. Adam Machanic Database Consultant SQLblog. About Me. Independent SQL Server and .NET Consultant Boston, MA. Author SQL Server 2008 Internals
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SESSION CODE: DAT318
Independent SQL Server and .NET Consultant
AuthorSQL Server 2008 Internals
Expert SQL Server 2005 Development
Conference and INETA Speaker
Connections, PASS, TechEd, DevTeach, etc.
The SQL Server Blog Spot on the Web
Txn 1 Starts
Txn 2 Ends
Txn 1 Ends
Txn 2 Starts
ALTER DATABASE AdventureWorks
SET CHANGE_TRACKING = ON;
ALTER TABLE HumanResources.Employee
1: Transaction Starts
2: Rows Modified
xact_id used in base and change table
3: Transaction Committed
> [version from the last collection]
… or …
Does [version from the last collection] == 0
Call CHANGETABLE in VERSION mode
Get the initial snapshot
Call CHANGETABLE in CHANGES mode
Get changes since the last collection
Store for the next iteration
Rows Modified, Transaction Committed
Log Reader kicks in, reads the changes from the log
Change information written to table in CDC schema
Advanced tracing infrastructure—new in SQL Server 2008
Designed from the ground up for performance and scalability
Similar scope to SQL Trace, but much bigger surface area
SQL Audit is built on top of XEvent
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