SQLAuthority News – Excellent Event – TechEd Sri Lanka – Feb 8, 2010

TechEd Sri Lanka was held at Waters Edge, Colombo between Feb 8 and Feb 10, 2010. It was one of the largest successful technical event in Sri Lanka. I was extremely surprised to how technically sound this event was and how excited the TechEd attendees were.

I presented there on two different subject. They were very enthusiastic and had so many interesting questions during the session. One of my session received rating of 8.9. I must thank you to all the attendees for sending their feedback and appreciating my session. Both of my session have received feedback above average.

The Other Side of SQL Server Index : Advanced Solutions to Ancient Problem (Rating 8.9)
SQL Server Index is very powerful tool and when in hand of the less skilled expert, the same tool can be very dangerous for performance and can kill server. This session touches the root base of the how incorrect usage of Index can reduce performance and what is the correct way to implement indexing solution. A problem addressed in the session may be age old but the solutions are looked into with the focus of latest versions of SQL Server.

The history of the Log: Change Data Capture (CDC) (Rating 7.8)
Learn to capture the history of data using CDC. An age old method of writing queries and triggers to capture change in database table is replaced with much powerful asynchronous method of change data capture (CDC). All attendees will learn how to configure CDC in less than 60 seconds.

Selected feedback from both of the sessions

  • I got massive knowledge from there Superb
  • Brilliant effort taken to educate us~! surely gonna make my life easier at office!!
  • The best presenter is this person
  • Presentation was very interesting and would be able to gather the points he talk easily
  • Great demo and presentation, cool stuffs.

Along with me there will be other two Solid Quality Mentors – Rushabh Mehta and Joy Ratnayake presenting on various topics. During my visit to Sri Lanka I had received the opportunity to meet MVP from Sri Lanka and I was able to attend the Sri Lanka SQL Server User Group Meeting as well.

Sri Lanka is wonderful place and I had great time to visit the country as well attend TechED Event. I am eagerly waiting for TechEd to come again in 2011.

TechEd SriLanka

TechEd SriLanka

Pinal at TechEd SriLanka

Pinal at TechEd SriLanka

Keynote at TechEd Sri Lanka

Keynote at TechEd Sri Lanka

Pinal Presenting at TechEd Sri Lanka

Pinal Presenting at TechEd Sri Lanka

Pinal Presenting at TechEd Sri Lanka

Pinal Presenting at TechEd Sri Lanka

Rushabh Mehta at TechEd Sri Lanka

Rushabh Mehta at TechEd Sri Lanka

Pinal Presenting at TechEd Sri Lanka

Pinal Presenting at TechEd Sri Lanka

UG Leaders and MVPs of Sri Lanka - Joy, Chandana, Gogula, Dinesh

UG Leaders and MVPs of Sri Lanka - Joy, Chandana, Gogula, Dinesh

Sri Lanka SQL Server User Group

Sri Lanka SQL Server User Group

Reference: Pinal Dave (http://blog.SQLAuthority.com)



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SQL SERVER – CDC and TRUNCATE – Cannot truncate table because it is published for replication or enabled for Change Data Capture

Few days ago, I got the great opportunity to visit Bangalore Infosys. Please read the complete details for the event here: SQLAuthority News – Notes from TechDays 2009 at Infosys, Bangalore. I mentioned during the session that CDC is asynchronous and it reads the log file to populate its data. I had received a very interesting question during the session.

The question is as follows: does CDC feature capture the data during the truncate operation? Answer: It is not possible or not applicable. Truncate is operation that is not logged in the log file, and if one tries to truncate the table that is enabled for CDC, it will right away throw the following error.

Msg 4711, Level 16, State 1, Line 1
Cannot truncate table because it is published for replication or enabled for Change Data Capture.

Let us create the scenario that will generate the above error.

/***** Set up TestTable *****/
USE AdventureWorks
GO
-- Create Table
CREATE TABLE dbo.TestTable (ID INT)
GO
-- Insert One Hundred Records
-- INSERT 1
INSERT INTO dbo.TestTable (ID)
SELECT TOP 100 ROW_NUMBER() OVER (ORDER BY a.name) RowID
FROM sys.all_objects a
CROSS JOIN sys.all_objects b
GO
/***** Enable CDC *****/
--The following script will enable CDC in AdventureWorks database.
USE AdventureWorks
GO
EXEC sys.sp_cdc_enable_db
GO
--Following script will enable CDC on dbo.TestTable table.
USE AdventureWorks
GO
EXEC sys.sp_cdc_enable_table
@source_schema = N'dbo',
@source_name = N'TestTable',
@role_name = NULL
GO
/* Attempt to Truncate Table will thrown following error
Msg 4711, Level 16, State 1, Line 1
Cannot truncate table 'TestTable' because it is published for replication or enabled for Change Data Capture.

*/
TRUNCATE TABLE TestTable
GO
/***** Clean up *****/
--Disabling Change Data Capture on a table
USE AdventureWorks;
GO
EXECUTE sys.sp_cdc_disable_table
@source_schema = N'dbo',
@source_name = N'TestTable',
@capture_instance = N'dbo_TestTable';
GO
--Disable Change Data Capture Feature on Database
USE AdventureWorks
GO
EXEC sys.sp_cdc_disable_db
GO
-- Drop Table
DROP TABLE TestTable
GO

The workaround for this is to either use DELETE statement instead of TRUNCATE or to disable CDC first and then enable the CDC on the table after the TRUNCATE operation is completed.

I am interested to know if you have any interesting fact of above CDC. I will publish the information on this blog with due credit.

Reference: Pinal Dave (http://blog.SQLAuthority.com)