Migrating the Alarms and Events Data
If you have upgraded Historian, you must migrate the alarms and events data as well. Only then you can retrieve the data.
The steps to migrate depend on the Microsoft SQL version in which the alarms and events data is stored:
- If using Microsoft SQL 2008 or later, you can install Historian and its components, install a supported version of Microsoft SQL, and then migrate the data.
- If using a version earlier than Microsoft SQL 2008, you must first migrate the data to Microsoft SQL 2008, and then migrate it to a supported version of Microsoft SQL.
To migrate data, you can choose one of the following options:
- Before upgrading to the latest version of Historian: In this case, you can use Historian Administrator of the older version of Historian to migrate the data.
- After upgrading to the latest version of Historian: In this case, you can use the Proficy Alarm Database Migration tool, which is provided with Historian.
This section describes how to migrate data using the migration tool.