---
title: DataHub
slug: litmusedge-v1/product-features/datahub
description: The DataHub module allows you to store data polled from the connected devices with data storage enabled. A variety of data formats are supported.
docTags: 
createdAt: 2022-03-30T21:10:59.000Z
---

The DataHub module allows you to store data polled from connected DeviceHub devices with data storage enabled. 

To store data, you must select the **Enable Data Store** option for the device you want to store data for. You have the option of storing data for a specific period of time to support analytics on the historic data in the **Retention Hours** field. See [Enable Data Store](docId:3eyAfPpweuVmBLCEy17sq) to learn more. 

Litmus Edge stores the polled data in a NoSQL timeseries database.

:::hint{type="info"}
**Limitation**: When using DataHub for storing data polled from connected devices, it's important to note the following limitations:

- InfluxDB initialization for large databases takes a long time with high CPU utilization. Ensure the Litmus Edge device has sufficient computing resources.
- DataHub does not store custom-formatted driver output like JSON or arrays to ensure efficient NoSQL timeseries database handling.
- DataHub handles string values differently than integers. As a result, when querying stored data, the way string and integer values are handled can impact the structure and results of your query.
  Sample Influx Query:
  - **For String Values: **`SELECT "value_str" FROM "temperature_readings" WHERE ("value_str"::field = 'pressure') AND $timeFilter`
  - **For Integer Values:** `SELECT "value" FROM "temperature_readings" WHERE ("value"::field = 555) AND $timeFilter`
:::

Depending on the version of Litmus Edge you are using, you will see one of the following UI configurations. 

# Litmus Edge Version 3.3.2 (and Earlier) and 3.11.0 (and Later)

You have the option of configuring an internal or external InfluxDB timeseries database. 

The DataHub UI is divided into three panes:

- **Configuration***: *Toggle the timeseries database, change source type, and perform additional customizations. 
- **DB Management**: Expand a database view to display your connected devices, remove specific data storage for a connected device, and delete the timeseries database.
- **DB Users**: Add and delete database users, reset a user's password, add privileges to a user, as well as view the user list.

# Litmus Edge Version 3.5.2, 3.5.3, 3.5.5, and 3.5.6

You can only configure an external InfluxDB timeseries database from the **DataHub **> **DataHub **pane. You can't configure an internal InfluxDB timeseries database. 

The *DB Management* and *DB Users *panes don't apply to the database configured from the **DataHub **> **DataHub **pane.

:::hint{type="warning"}
**Important**: The DataHub (Legacy) configuration page will be removed in a future release. You will need to create new configurations and migrate existing DataHub (Legacy) configurations to the DataHub page. 
:::

# Next Steps

- [Configure the Timeseries DB](docId\:V0B5qmjOQnp8qvVIaI7iT)
- [DB Management](docId\:C_t7MlcO8-NY6OUvR2CV7) 
- [DB Users](docId\:Up8d2DklbKDMlK5nWAJBB)