Noman Khan, a 4th semester CS student, is giving a presentation on transaction properties (ACID properties) for his Computer Science department. The presentation discusses that a transaction must either fully commit or rollback, leaving the data in a consistent state. A transaction must also have four key properties: Atomicity, ensuring all-or-nothing changes; Consistency, ensuring valid state transitions; Isolation, ensuring transactions don't interfere; and Durability, ensuring transaction changes survive crashes.

1.  NAME>>>>>>>>>>>>>>>>>>NOMAN KHAN
 CLASS NO>>>>>>>>>>>>>>>>>>CS-14
 SEMESTER>>>>>>>>>>>>>>>>>>4TH
 DEPT/COLLEGE>>>>>>>>>>>>>COMPUTER
SCIENCE/GOVT SUPERIOR SCIENCE
COLLEGE
 PRESENTATION TOPIC>>>>>>>>>>>>>
>TRANSACTION PROPERTIES(ACID
PROPERTIES)
presentation 1

2.  A transaction is defined as logical unit of
work.
 One or more operations on a database must
be completed together.
 A transaction must either complete
successfully or fail.
 COMMIT
 ROLLBACK
presentation 2

3.  Commit:
A transaction is committed if it completes
successfully and change the data.
 Rollback:
A transaction is Rollback, If it fails and leaves
the data and unchanged, it is said that the transaction
has been Rollback.
 It means the Rollback is used to undo the work done in
the current transaction.
presentation 3

4. presentation 4

5.  A transaction must have four
properties known as ACID properties,
these are follows:
1. Atomicity
2. Consistency
3. Isolation
4. Durability
presentation 5

6.  A transaction must be an atomic unit of work.
 A transaction must completely succeed or
completely fail.
 If any statement in transaction fails, the entire
transaction fails completely.
 Commit
 Rollback
 An incomplete transaction does not take place.
presentation 6

7.  The consistency property ensure that any
transaction will bring the database from one valid
state to another.
 A transaction must leave the data in a consistent
state after completion.
 For example:
 In a bank database money should never be
“created” or “deleted” without an appropriate
deposit or withdrawal.
presentation 7

8.  All transaction that modify the data are isolated
from each other.
 They do not access the same data at the same time.
 Transactions must have no effect on other
transactions.
 A modifying transaction can access the data only
before or after another transaction is completed.
 The change done by a transaction should be
invisible to others.
presentation 8

9.  It means that the modification is made by a
transaction are permanent and persistent.
 If the system is crashed or rebooted, data should
be guaranteed to be completed when computer
restarts.
 In a relational database , for instance, once a group
of SQL statement execute, the result need to be
stored permanently(even if the database crashes
immediately thereafter.
presentation 9

10. presentation 10