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Transaction states PPT
 Because failures occurs, transaction are broken up 
into states to handle various situation. 
 Active, the initial state; the transaction stays in 
this state until while it is still executing. 
 A transition is terminated only if it has either been 
committed or aborted.
 The DBMS needs to write out enough information to 
disk so that, in case of a failure, the system could re-create 
the updates performed by the transaction once 
the system is brought back up. After it has written out 
all the necessary information, it is committed.
 Committed- after successful completion. 
 Once committed, the transaction can no longer be 
undone by aborting it. 
 Its effect could be undone only by a compensating 
transaction.
 Aborted, after the transaction has been rolled 
back the the database has been restored to its state 
prior to the start of the transaction. 
 The DBMS could either kill the transaction or 
restart the transaction. 
 A transaction may only be restarted as a result of 
some hardware or software error, and a restarted 
transaction is considered a new transaction.
 Thus the possible sequence of states are: 
 Active -> Partially committed -> Committed 
 Active -> Partially committed -> Aborted 
 Active -> Failed -> Aborted
Transaction states PPT
Ravi Ranjan MCA- I Iyr

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Transaction states PPT

  • 2. Because failures occurs, transaction are broken up into states to handle various situation. Active, the initial state; the transaction stays in this state until while it is still executing. A transition is terminated only if it has either been committed or aborted.
  • 3. The DBMS needs to write out enough information to disk so that, in case of a failure, the system could re-create the updates performed by the transaction once the system is brought back up. After it has written out all the necessary information, it is committed.
  • 4. Committed- after successful completion. Once committed, the transaction can no longer be undone by aborting it. Its effect could be undone only by a compensating transaction.
  • 5. Aborted, after the transaction has been rolled back the the database has been restored to its state prior to the start of the transaction. The DBMS could either kill the transaction or restart the transaction. A transaction may only be restarted as a result of some hardware or software error, and a restarted transaction is considered a new transaction.
  • 6. Thus the possible sequence of states are: Active -> Partially committed -> Committed Active -> Partially committed -> Aborted Active -> Failed -> Aborted