Backfill or recalculate data for multiple analyses

PI Analysis Service 2016 R2 introduced recalculation capabilities for expression, rollup and SQC analyses. Data Archive storing the output PI points must be running version 2016 R2 or later. Beginning with PI Analysis Service 2018, you can opt for recalculation of all dependent analyses. An analysis whose input comes from an output of another analysis is considered dependent.

1. In the navigator, select Management at the bottom of the list.

2. Select Analyses radio button in the Management pane.

3. Optional. From Analysis Searches, select a search query and then select the result you want to operate upon.

   For example, select Enabled.

   Only the analyses that meet the criterion () are displayed.

4. In the Analyses pane, select the analyses you want to backfill or recalculate.

5. In the Operations pane, select Queue backfilling or recalculation for selected analyses.

   Note: From PI AF 2018 SP2, you can also cancel backfilling on multiple analyses with Cancel backfilling or recalculation for selected analyses.

6. In the Start Time and End Time fields, specify the time period for which you want to backfill missing data while retaining existing data, or delete and recalculate data. You can use standard PI time expressions, or click to select a specific date period.

7. Choose from the following actions:

   To backfill or recalculate ...	Do this ...
   Expression, rollup, or SQC analyses only	Decide how existing data should be treated: To ensure that existing data is retained and only missing data is backfilled, select Leave existing data and fill in gaps. If input data or analysis algorithms have changed and you want to delete existing output data, select Permanently delete existing data and recalculate.
   A mix of analyses that includes event frame generation analyses or More than a page of analyses selections	Perform one of the following actions: Keep Leave existing data and fill in gaps selected and acknowledge that event frames in the time range will be permanently deleted along with all annotations on those event frames. Select Permanently delete existing data and recalculate. All annotations on event frames will be lost. Optional. Check the box next to Recalculate dependent analyses to queue all dependent analyses for manual recalculation. Selecting this option may cause recalculation to occur multiple times for dependent analyses The recalculation time range for dependent analyses may be different than the time range you selected when queuing recalculation

   There are three factors affecting the recalculation time range of dependent analyses:

   • Time range of the original analysis

   • How the output of the original analysis is used in the dependent analyses

   • Whether or not the output time override is configured in the original analysis

8. Click Queue to start multiple backfills or recalculations.

9. Review the Pending Operations pane for details on the backfill or recalculation status.