Exam 70-463: Implementing a Data Warehouse with Microsoft® SQL Server® 2012: Training Kit by Dejan Sarka Matija Lah & Grega Jerkic

Author:Dejan Sarka, Matija Lah & Grega Jerkic [Dejan Sarka, Matija Lah, and Grega Jerkic]
Language: eng
Format: epub
Tags: COMPUTERS / Database Management / Data Mining
ISBN: 9780735666085
Publisher: Microsoft Press
Published: 2012-12-13T16:00:00+00:00

Executions

As mentioned earlier in this lesson, the execution of an SSISDB package begins with the creation of a new execution instance; the principal purpose of the execution instance is to provide a reference between a package being prepared for execution and its corresponding configuration. Another purpose is to document (log) the execution itself.

Packages stored in the SSISDB catalog are abstract entities. When an execution instance is created and a configuration is assigned to it, a concrete instance of the package is created, containing all of the information that is required for its execution. The abstract entity of a package can be executed in as many different ways as there are possible configurations, but a concrete instance of the package is executed by using a specific configuration.

When the execution instance is created, an environment containing configuration information expected by the package can be assigned to it. Only a single environment reference can be assigned to a particular execution instance.

After the execution instance has been created, additional configurations can be assigned to it. These direct assignments can target the properties of the instance, as well as the parameters and/or properties of the package being executed. For instance, direct assignments can be used to supply values to properties and parameters that are not supplied by the environment, or to override the values supplied by the environment.

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