About the auto-summary partition

AVEVA Historian maintains a separate auto-summary partition for storing automatically generated summaries used for faster retrieval over long time intervals. There, Historian generates a local replication entity and a one-hour summary tag for every analog tag in the system. As values arrive for an analog tag, Historian automatically computes and records a summary.

Auto-summary values are stored in their own history blocks within the auto-summary partition. With auto-summarization, Historian can quickly and efficiently retrieve large-volume data for a long duration, even months or years.

Note: The auto-summary feature was available beginning with AVEVA Historian 2017. From the time you installed or upgraded to AVEVA Historian 2017, the system has been creating auto-summary values for your analog tags. To backfill values for time before that installation or upgrade, you can use the Replication Backfill Manager.