What happens if you delete the source tag for a summarized tag?

When dealing with summarized tags in the AVEVA Historian system, it is crucial to understand the relationship between the source tags and their corresponding summarized tags. A summarized tag relies on data from its source tag to generate summaries.

If you attempt to delete a source tag that is linked to a summarized tag, the system enforces a rule to ensure data integrity: the summarized tag cannot exist without the source tag providing its foundational data. Therefore, attempting to delete the source tag would also require the deletion of any associated summarized tags. This maintains the coherence and validity of the data within the historian environment, ensuring that data relationships remain intact and that users are not left with incomplete or misleading summaries in their datasets.

Other options suggest scenarios that don't align with the operational principles of the AVEVA Historian, such as preserving data without source tags or allowing deletions that undermine the hierarchical structure of data dependency. Thus, recognizing that a source tag's deletion necessitates the removal of its dependent summarized tag reflects an essential understanding of how these components interact within the historian's architecture.