How often does delta retrieval check for changes in AVEVA Historian?

Delta retrieval in AVEVA Historian is designed to check for changes at specified intervals. This approach allows the system to efficiently update and retrieve only the data that has changed since the last retrieval, optimizing performance and reducing the load on the server.

When delta retrieval is set to check for changes at predetermined intervals, it ensures that users receive timely updates without the need for constant querying, which would be resource-intensive. This configuration is beneficial for applications that require regularly updated data, as it strikes a balance between data freshness and system performance.

In contrast, alternatives such as retrieving data once a day, doing so only during system initialization, or every time a query is executed would not provide the same level of efficiency or responsiveness to data changes. These methods could lead to either outdated information or excessive system resource consumption. Thus, the specified intervals approach offers the optimal solution for managing data in a dynamic environment like AVEVA Historian.