# Historian Splitter - Backfill

**URL:** <https://forum.inductiveautomation.com/t/historian-splitter-backfill/71635>\
**Category:** Ignition\
**Created:** [March 27, 2023, 1:38pm UTC](https://forum.inductiveautomation.com/t/historian-splitter-backfill/71635 "2023-03-27T13:38:20Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [March 27, 2023, 1:49pm UTC](https://forum.inductiveautomation.com/t/historian-splitter-backfill/71635/2 "2023-03-27T13:49:46Z")

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The schema is documented, but you are basically on your own. See this related discussion:

> [@Migration Historical Data](https://forum.inductiveautomation.com/t/migration-historical-data/71479):
>
> I have a Ignition setup, which uses only one database connection. Historical data tables per month have more than 200 billion rows and size more than 50GB each one. How to correctly transfer historical data tables to another database without lost data? I would like to know the correct sequence of actions. Please help.

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