What is the index manager screen?
The first time a tag is used, either by adding the tag to the focus chart or by running a batch-indexing script, the full history of the tag will be indexed. Afterwards, TrendMiner will keep the indexes of these tags up to date.
The indexing manager screen provides an overview of the health of the indexed tags. It can be used by the admin to easily find a tag of interest and deleting the index, if needed.
Why use the index manager?
Indexing happens backwards in time to make sure that recent data can already be searched, while waiting for the older time periods to be indexed. Tag data are refreshed every hour. It is crucial to understand the status of tag indexing as this relates directly to the quality of any TrendMiner analysis.
How to use the index manager
Use the index manager to search through your indexed tags by;
- Sorting on index start date and last updated date;
- on name; and by,
- filtering on index status.
You can easily identify any indexing problems by looking to the index state column:
|Tag completely up to date. Backwards indexing was successful and recent data was successfully appended.|
|Backwards indexation process in progress.
Will switch to OK after completion. Data which is indexed can already be used in the analyses.
Backwards indexing was performed but an error (e.g. historian connection loss) occurred during this process.
The Index start date indicates where the backwards process stopped.
The indexation will automatically be retried when the tag is used again.
|Recent data was not successfully appended (e.g. due to historian connection issues), delaying potential monitoring events.
This state gets priority on incomplete state
|Trendminer is unable to update the index of the tag (tag or dependent tag does no longer exist). TrendMiner will disregard these tags when updating the most recent data.
If the root cause is resolved, the indexation process will automatically resume when the tag is used again.
|In the event that the responsible service for indexing goes down, tags which were in progress will go to failed. These tags should be reindexed afterwards to ensure their correctness.|
Index manager in older versions
In older versions of TrendMiner, additional buttons can be found at the top of index manager screen:
- Refresh overview: refreshes the states of the indexed screen on the overview screen
- Check index button: checks all available indexes for corruption (out of order points) and prints out the corrupted tags in the logs.
- Repair button: checks all available indexes for corruption (out of order points) and throws away the data from the time the corruption is found up until the now moment.
These actions are currently obsolete and hence the buttons have been removed. The table will update automatically and out of order points should not happen anymore since the introduction of the new index manager in the 2020.R1 release. If needed, these actions can still be executed by performing an API call. Please get in contact with support if this should be required.