DataBase Transaction

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DataBase Transaction
Introduction goes here
DataBase Transaction?


A transaction begind when the first DML statement is encountered and ends when one of the following occurs:


  1. A COMMIT or ROLLBACK statement is issued
  2. A DDL statement such a CREATE is issued
  3. A DCL statement is issued


There are two Types of Transaction Control Statements:


  1. Explicit Transaction Control Statements
  2. Implicit Transaction Control Statements


Explicit Transaction Control Statements :


 You can Control the logic of transactions by using the COMMIT,SAVEPOINT and ROLLBACK statements.




Satae of the Date after COMMIT:

 Ends the current transaction by making all Pending data changes Permanent.


a)    The previous state of the data is permanently lost

b)    All users can view the results of the transaction

c)     The locks on the eaffected rows are released

d)    All save Points are erased



  Delete from emp where empid=101;

     1 row deleted.


  Insert into emp values(101,’smile’);

     1 row inserted.


   Commit the changes:



    Commit Complete.




Marks a savepoint within the current transaction.




a)    It ends the current transaction by discarding all pending data changes

b)    Previous state of the data is restored.

c)     Locks on the affected rows are released.



Delete from emp;

10 rows deleted.



Rollback Complete.


Delete from emp where empid=101;

1 row deleted.



Implicit Transaction Control:


  An automatic commit occurs under the following circumstances:


a)    DDL statement is issued.(Create ,Alter,Drop,Rename,Truncate)

b)    DCL statement is issued.(Grant and Revoke)

c)     Normal exit without issuing COMMIT or ROLLBACK Statements


  An automatic Rollback occurs under an abnormal termination.

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Full Name: Syed Shakeer Hussiain P
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Syed Shakeer Hussain
Shakeer Hussain has completed his Master of Computer Applications degree from Deccan College of engg and technology of Osmania University.He is a MVM of has good experience in the areas of ASP.NET, C#.NET, VB.NET, SQL SERVER 2000/2005 and Windows Mobile. He has worked in Windows Mobile,Web Applicatin and ERP projects.

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