# Power Chart not working for tags from DB Table Historian

**URL:** <https://forum.inductiveautomation.com/t/power-chart-not-working-for-tags-from-db-table-historian/40581>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [November 12, 2020, 1:39pm UTC](https://forum.inductiveautomation.com/t/power-chart-not-working-for-tags-from-db-table-historian/40581 "2020-11-12T13:39:34Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![gahinz](https://avatars.discourse-cdn.com/v4/letter/g/5e9695/32.png) [@gahinz](https://forum.inductiveautomation.com/u/gahinz)\
**Post date:** [November 12, 2020, 1:39pm UTC](https://forum.inductiveautomation.com/t/power-chart-not-working-for-tags-from-db-table-historian/40581/1 "2020-11-12T13:39:34Z")

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I created a new Historical Tag Provider of the type DB Table Historian however, right now I am not able to display them in the power chart for some reason.

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**Author:** ![mik977](https://avatars.discourse-cdn.com/v4/letter/m/5f8ce5/32.png) [@mik977](https://forum.inductiveautomation.com/u/mik977)\
**Post date:** [December 5, 2020, 7:23am UTC](https://forum.inductiveautomation.com/t/power-chart-not-working-for-tags-from-db-table-historian/40581/2 "2020-12-05T07:23:03Z")

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I am also experiencing the same issue. As soon as I add a pen from DB Table Historian, all pens disappear (also the tag historian ones).

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**Author:** ![code\_skin](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@code\_skin](https://forum.inductiveautomation.com/u/code_skin)\
**Post date:** [December 7, 2020, 3:37pm UTC](https://forum.inductiveautomation.com/t/power-chart-not-working-for-tags-from-db-table-historian/40581/3 "2020-12-07T15:37:47Z")

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What version of Ignition of you running?

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<div class="post-metadata">

**Author:** ![mik977](https://avatars.discourse-cdn.com/v4/letter/m/5f8ce5/32.png) [@mik977](https://forum.inductiveautomation.com/u/mik977)\
**Post date:** [December 8, 2020, 7:34am UTC](https://forum.inductiveautomation.com/t/power-chart-not-working-for-tags-from-db-table-historian/40581/6 "2020-12-08T07:34:25Z")

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I defined a DB Table History Provider: CVTrendlog

The table i am using as datasource:  
name: trendlog  
datum (timestamp)  
tagname (text)  
fvalue (float8)  
quality (int4)

And the Pen Tag Path is:  
histprov:CVTrendlog:/table:trendlog:/column:fvalue:/timestamp:datum:/keycolumn:tagname:/keyvalue:m10:5:0

Testing in a Perspective PowerChart component, Ignition v8.1.0