Friday, February 21, 2014

Implementing Transaction in SSIS Package

FROM MSDN:-

     

What is Transaction in SSIS package and how to implement it? (SSIS Interview Questions)

Packages use transactions to bind the database actions that tasks perform into atomic units, and by doing this maintain data integrity. All Microsoft Integration Services container types—packages, the For Loop, For each Loop, and Sequence containers, and the task hosts that encapsulate each task—can be configured to use transactions. Integration Services provides three options for configuring transactions: NotSupported, Supported, and Required.

  • Required indicates that the container starts a transaction, unless one is already started by its parent container. If a transaction already exists, the container joins the transaction. For example, if a package that is not configured to support transactions includes a Sequence container that uses the Required option, the Sequence container would start its own transaction. If the package were configured to use the Required option, the Sequence container would join the package transaction.
  • Supported indicates that the container does not start a transaction, but joins any transaction started by its parent container. For example, if a package with four Execute SQL tasks starts a transaction and all four tasks use the Supported option, the database updates performed by the Execute SQL tasks are rolled back if any task fails. If the package does not start a transaction, the four Execute SQL tasks are not bound by a transaction, and no database updates except the ones performed by the failed task are rolled back.
  • NotSupported indicates that the container does not start a transaction or join an existing transaction. A transaction started by a parent container does not affect child containers that have been configured to not support transactions. For example, if a package is configured to start a transaction and a For Loop container in the package uses the NotSupported option, none of the tasks in the For Loop can roll back if they fail.

Other Interview Questions

No comments:

Post a Comment