Coordinating Updates across Databases with Distributed Transactions
Distributed Transactions
Write a SQL script to demonstrate a distributed transaction using MSDTC (Microsoft Distributed Transaction Coordinator).
Solution:
BEGIN DISTRIBUTED TRANSACTION;
-- Update data in the local database.
UPDATE LocalDB.dbo.Customers SET Status = 'Active' WHERE CustomerID = 1;
-- Update data in the remote database.
UPDATE RemoteDB.dbo.Orders SET Status = 'Shipped' WHERE OrderID = 101;
COMMIT TRANSACTION;
Explanation:
- Purpose of the Query :
- The goal is to demonstrate how distributed transactions coordinate updates across multiple databases.
- Key Components :
- BEGIN DISTRIBUTED TRANSACTION: Starts a distributed transaction.
- Requires MSDTC (Microsoft Distributed Transaction Coordinator).
- Why use Distributed Transactions? :
- Ensures atomicity across multiple databases or systems.
- Real-World Application :
- Useful in enterprise systems integrating multiple data sources.
Additional Notes:
- Distributed transactions require coordination between multiple databases or systems, often using MSDTC (Microsoft Distributed Transaction Coordinator).
- Ensure that MSDTC is properly configured and enabled on all participating servers.
- Distributed transactions can introduce latency and complexity, so use them sparingly and only when necessary.
For more Practice: Solve these Related Problems:
- Write a SQL query to coordinate updates across multiple databases using a distributed transaction with MSDTC.
- Write a SQL query to test the atomicity of a distributed transaction involving updates in a local and remote database.
- Write a SQL query to configure and enable MSDTC on all participating servers for a distributed transaction.
- Write a SQL query to observe the latency and complexity introduced by a distributed transaction in an enterprise system.
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