Rockwell Automation 1756-HIST2G Historian ME 2.1 - Manual (Page 57)

3 • V IEWING M ODULE I NFORMATION
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Archive File Statistics
The FactoryTalk Historian ME stores your data in archives, which are files that hold
FactoryTalk Historian ME data. Archive files are fixed which means that they are
always the same size, regardless of how much data they contain.
The archive receiving current data is called the primary archive. When the primary
archive becomes full, an archive shift occurs and the next available archive becomes
the new primary archive. When the primary archive is being backed up, you cannot
modify that archive or the Point database.
Each archive file contains events for a time period specified by the archive start time
and end time. The archive files on each FactoryTalk Historian ME server should cover
all time ranges, without overlapping time ranges or gaps in time. A list of archive