ClearSCADA contains a Historian through which incoming data from remote devices can be historically recorded. The historian uses a proprietary database engine to store historic data associated with events and point data. This data can later be retrieved in the form of trends, lists or directly with SQL queries.
Trends are graphical displays that plot the values of database points and time profiles. They allow you to view and compare the values of points over a specific period of time. This is particularly useful when you need to determine if there are any patterns in the data, for example, you may need to compare the level of water in 3 different rivers over a month period.
Page: Adding Historic Data to Points
Page: Configuring Appropriate Event and Historic Cache Sizes
Page: Copying Historic data to third party applications like Excel
Page: Display Progressive Trend As Bar Graph
Page: Finding large historic granules
Page: Historian Disk Usage
Page: Historic Compression Settings Seem to be Ignored
Page: Historic Data and Event Journal File Format
Page: Importing History Using LoadDataValue and LoadDataFile
Page: Memory Footprint of Unflushed Point Data In Memory
Page: Overview of Data Archiving
Page: Recovering from Lost or Damaged Archive Volumes
Page: Unexpected Historic Database Logging
Page: Viewing Archive Data in a Spreadsheet