GAPTHEGURU

Geek with special skills

What is MSDTC and why do I need to care about it?

MSDTC is an acronym for Microsoft Distributed
Transaction Coordinator. As the name says, MSDTC is a Windows service
providing transaction infrastructure for distributed systems. In this
case, a transaction means a general way of structuring the interactions
between autonomous agents in a distributed system. Each transaction is a
state transformation with four key properties – the ACID properties:
Atomic (all or nothing), Consistent (legal), Isolated (independent of
concurrent transactions) and Durable (once it happens, it cannot be
abrogated). There are different techniques that implement the ACID
properties but the most known one is two-phase commit.

In other words, transaction processing is a software
technology that makes distributed computing reliable. You can see a
transaction as a unit of work in which a series of operations occur. The
transaction (with its ACID properties) is providing protection in the
case when one or more of these operations fail at any point in time. By
using transactions, you can vastly simplify the error recovery for your
system.

The main actors in a transaction are: the transaction
manager (MSDTC), the initiator (the application which started the
transaction) and the resource managers (the entities that manage data
and work). The flow of actions in a simplified form is:

1. The client application (the initiator) begins a transaction by requesting one from the transaction manager;

2. The client app asks the resource managers to do work as part of
the same transaction; during this step, the resource managers register
with the transaction manager for that transaction (“they enlist”);

3. The client app commits the transaction;

4. The transaction manager coordinates with the resource managers to
ensure that all succeed to do the requested work or none of the work if
done, thus maintaining the ACID properties.

The main transactions standard currently supported by MSDTC is the OLE Transactions (or OleTx). MSDTC is also supporting other standards like XA (or X/Open Distributed Transaction Processing Standard) and TIP (Transaction Internet Protocol). In the future MSDTC will support WS-Coordination, WS-AtomicTransaction, and WS-BusinessActivity.

You can read more about MSDTC at http://msdn.microsoft.com/library/?url=/library/en-us/cossdk/htm/dtc_toplevel_6vjm.asp?frame=true.

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11/09/2011 - Posted by | Sql Server

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