Page History

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The History tab contains a Main section and an Advanced section.

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HistoryMain HistoryMain

History - Main

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• Name
  • The name of the History Store.
• Enabled
  
  • Checkbox to enable/disable the History Store. Not selected by default.
• Type
  • The type of History Store.
  • Data stored in an In-Memory History Store will not be persisted across a module configuration change, module disable/enable, module restart or power loss. 
  • Data stored in a Disk-Backed History Store will persist across a module configuration change, module disable/enable, module restart or power loss.
• History Max Size
  • Maximum number of megabytes history can use before dropping the data
  • An In-Memory History store will use the Ignition Java Heap memory
• History Max Age
  
  • Maximum number of minutes to store history before dropping the data.
• Flush Quantity
  • The maximum number of tags to publish in a single message upon reestablishing communication.
• Flush Period
  • The period to wait in milliseconds between publishes when flushing messages upon reestablishing re-establishing communication

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HistoryAdvanced HistoryAdvanced

History - Advanced

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Rolling History Settings

• Enable Rolling History Buffer
  • Enable/disable storing data in a rolling buffer to cover data loss in Keep Alive timeout scenario
• Rolling History Prune Interval
  • The interval, in seconds at which to attempt to prune the rolling history buffer
• Rolling History Max Age
  • The maximum age allowed of data, in seconds, in the rolling history buffer
  • This should be at least 2 x the Keep Alive timeout
• Rolling History Prune Quantity
  • The number of metrics to prune in a single block

Advanced Settings

• H2 Database Port
  • TCP Port to connect to H2 Database for Disk-Backed History Store