Enable or Disable Historic Data Storage

The Historic Data feature allows data to be stored in the database as historic data that can be searched and accessed. The historic data is useful for comparing values over periods of time and observing patterns in the data.

To allow ClearSCADAto store the historic values of database items, you need to enable the Historic Data feature. However, you should only enable Historic Data if you really need to use past values as storing historic data will place a demand on your system's resources.

To enable or disable the Historic Data feature:

1. Access the ClearSCADA Server Configuration Tool, (see Accessing the ClearSCADA Server Configuration Tool).
2. Expand the Historic Configuration branch.
3. Select the Historic Data type.

   

4. Either:
• Select the Enabled check box in the Historic Data section to allow ClearSCADA to store values in the historic database.

  Or:

• Clear the Enabled check box in the Historic Data section if your system is not required to store data historically.
5. Right-click on the system icon in the tree-structure, and select the Apply Changes option to apply the changes.

When the Historic Data feature is enabled, the points, master station accumulators, and so on, can be configured to have their values stored historically in the database.

To store point or master station accumulator data historically, historic also needs to be enabled on the individual points and master station accumulators. For information, see Defining Historic Details for a Point in the ClearSCADA Guide to Core Point Configuration, and see Tabs on Accumulator Forms in the ClearSCADA Guide to Core Configuration. (Historic storage is disabled by default on new points and accumulators).

The historic values of the items are stored for a defined amount of time (see Specify the Duration to Retain Historic Data Online). At the end of the defined time, the values are deleted or archived as required (see Archiving).

Now that you have enabled or disabled the historic data feature, you can either proceed to configure other Historic Configuration settings (see Historic Configuration Settings) or you can continue with the server configuration.