There are two types of distributed transactions: flat and nested. A flat transaction involves multiple hosts but has a single level, while a nested transaction can have subtransactions with their own transaction identifiers. An example is given of a nested banking transaction with withdrawals and deposits as subtransactions managed by a transaction manager across different clients. Distributed transactions allow for transactions spanning multiple network hosts and systems.

1. Distributed
Transaction.
-Shraddha Mane

2. Distributed Transaction:
A distributed transaction is a database
transaction in which two or more network hosts
are involved. Usually, hosts provide transactional
resources, while the transaction manager is
responsible for creating and managing a global
transaction that encompasses all operations
against such resources

3. Client
X
Y
Z
X
Y
M
NT1
T2
T11
Client
P
T
T12
T
21
T
22
T
T
.
Fig(a):Flat Transaction Fig(b):Nested Transaction
Types of Distributed Transaction:

4. Example of
Nested banking transaction
a.withdraw(10
)
c.deposit(10)
b.withdraw(20
)
d.deposit(20
)
Client A
B
C
T
1
T
2
T
3
T
4
T
D
X
Y
Z
T =openTransactio
nopenSubTransactio
n a.withdraw(10)
;
closeTransaction
openSubTransactio
n b.withdraw(20)
;
openSubTransactionc.deposit(10)
;
openSubTransactiond.deposit(20)
;

5. Migration in
heterogeneous system.