Transaction

2. Disclaimer: This presentation is prepared by
trainees of baabtra as a part of mentoring
program. This is not official document of baabtra –
Mentoring Partner
Baabtra-Mentoring Partner is the mentoring division of baabte System
Technologies Pvt . Ltd

3. Syed Maharoofthangalc
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4.  A transaction is a sequential group of one or
more SQL commands.
 Which is performed as one single work unit.
 A transaction will never be complete unless
each individual operation within the group is
successful

5.  Atomicity
Ensures that all operations within the work unit are
completed successfully; otherwise, the transaction is
aborted at the point of failure and previous operations
are rolled back to their former state.
 Consistency
◦ Ensures that the database properly changes states
upon a successfully committed transaction.

6.  Isolation
◦ Enables transactions to operate independently on
and transparent to each other.
 Durability
◦ Ensures that the result or effect of a committed
transaction persists in case of a system failure.

7.  transactions begin with the statement BEGIN
TRANSACTION
 End with either a COMMIT or a ROLLBACK
statement.
 The SQL commands between the beginning
and ending statements form the bulk of the
transaction.

8. Commit and Rollback
• When a successful transaction is completed, the
COMMIT command should be issued so that the
changes to all involved tables will take effect
• If a failure occurs, a ROLLBACK

9. Autocommit
The transaction can be control by setting
autocommit.
 Set autocommit disables or enables the default
autocommit mode for the current session.
Set autocommit=0|1.

10. • If AUTOCOMMIT is set to 1 then each SQL
statement is considered a complete
transaction and committed by default when it
finishes.
• AUTOCOMMIT is set to 0, the subsequent
series of statements acts like a transaction and
no activities are committed until an explicit
COMMIT statement is issued.

11. Example
Create procedure sample()
Begin
START TRANSACTION;
Insert into tbl_user values(‘1’,’john’);
Insert into tbl_login values(‘1’,’jhon’,’john123’);
COMMIT;
End

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