Data storage: Preserving huge amounts of data over time

Historian, through its Storage subsystem, saves plant data from various sources to disk.

Historian’s efficient storage model includes:

• A range of storage modes
  Historian’s storage modes allows storage of every meaningful value and extrapolation of all other values at retrieval time.

• History blocks and partitions
  Historian efficiently warehouses huge amounts of data using a compact storage format that is optimized for time-series data.

• Auto-summarization
  Historian calculates and stores automatic summary records as real-time analog tag values. These auto-summaries are used provide fast, seamless data retrieval, no matter what the granularity.