What is MSDTC in cluster?
MSDTC is a separate Windows service which coordinates distributed transactions across SQL Server instances. When deploying SQL Server in a highly available environment like Windows Failover Clustering, there are certain best practices that can make the MSDTC service’s behavior more predictable.
What is MSDTC server?
The Microsoft Distributed Transaction Coordinator (MSDTC) service is a component of modern versions of Microsoft Windows that is responsible for coordinating transactions that span multiple resource managers, such as databases, message queues, and file systems.
Is MSDTC supported when using Alwayson availability groups?
For Failover Cluster Instances we can create an MSDTC per instance because each one is its own instance of SQL Server. However, if you have multiple AGs they are most likely in the same instance of SQL Server and every AG will use the same MSDTC.
How do I configure Msdtc?
Configure MSDTC
- Open Component Services.
- Expand Component Services, expand Computers, expand My Computer, expand Distributed Transaction Coordinator, right-click Local DTC, and select Properties.
- Select the Security tab.
- Select OK to save your changes.
- If prompted to restart the MSDTC service, select Yes.
How do I create a DTC cluster?
To add DTC as a dependency of the SQL Server resource in Failover Cluster Manager:
- Right click on the SQL Server resource and select Properties.
- Select the Dependencies tab.
- Click Insert.
- On the new line, from the dropdown select the DTC resource you created. An example is shown in Figure 14.
- Click OK when done.
What do you need to know about MSDTC cluster?
This is because each MSDTC Clustered instance requires a Physical Disk, IP and Network Name Resource. Note: When you add a MSDTC resource to a SQL Server Group you can use one of the SQL Server Disks and SQL IP and Network Name for the MSDTC resource dependencies.
Is there an instance of MSDTC in SQL Server?
SQL Server 2008 and later will take advantage of an instance of MSDTC installed to the SQL Server’s local cluster resource group by automatically using the instance of MSDTC in the SQL Server’s Cluster Group. This is a feature of SQL 2005 and above and does not hold true for other applications.
What happens if we choose a local MSDTC?
Using a clustered MSDTC configuration is straightforward. If Node1 fails, both the SQL Failover Cluster Instance and the Clustered MSDTC fail over to Node2. Since the Clustered MSDTC is using shared storage, it still has its log and can handle any in-doubt transactions. What happens if we choose a Local MSDTC?
What kind of configuration do I need for MSDTC?
MSDTC configuration is not as straight forward as you might think. It’s a different choice if you are using a local MSDTC, clustered MSDTC, on-premises, Azure, Failover Cluster, or Availability Group. Every one of those variables leads you down a different path with different choices.