Which retrieval method is applied in a query if no retrieval method is specified?

In the context of querying data within the AVEVA Historian Server, when no specific retrieval method is designated, the system defaults to the Delta retrieval method. This approach is designed to retrieve data points that represent changes over a specific time interval. By focusing on these changes, it provides a more dynamic view of the data, highlighting variations rather than just static metrics.

The Delta method is especially useful in environments where understanding fluctuations or trends over time is critical. This contrasts with other methods like Average, Maximum, or Minimum, which would aggregate data points in a different manner, potentially obscuring important information about change and movement in the dataset.

Thus, using the Delta method as the default reflects the need for capturing and analyzing variation, making it a logical choice in the absence of a specified retrieval method.