# Refreshing a datasource

Refreshing your datasource ensures that the data Tellius uses for analysis is current and accurate. You can:

* **Refresh Immediately**: Update the data on the spot.
* **Schedule a One-Time Refresh**: Set a specific future date and time to run the refresh once.
* **Configure a Periodic Refresh**: Establish a recurring schedule (daily, weekly, monthly, etc.) to keep data continuously up-to-date.

By choosing the right refresh strategy, you maintain data freshness while optimizing performance and reducing manual work.

### Refreshing a data source

1. Go to **Data → Connect**, click on the three-dot kebab menu of the required datasource and select **Refresh**. The following window will be displayed:

<figure><img src="https://content.gitbook.com/content/8GaK1h3pmgbR63x0ftET/blobs/RE6FHy9a0rWoEzA0ovmf/image.png" alt="" width="563"><figcaption><p>Refreshing a data source</p></figcaption></figure>

2. In the left pane, select **"All Datasets"** to refresh all datasets associated with the selected datasource. Else, select the individual datasets to refresh rather than the entire datasource.
3. Choose the refresh method from the three available tabs: Immediate, Periodic, One-time.
4. All the refreshes can be tracked in the **Notifications** tab.

#### Immediate Refresh

<figure><img src="https://content.gitbook.com/content/8GaK1h3pmgbR63x0ftET/blobs/5mZ7XvAPEK3xl8s2Tfes/image.png" alt="" width="563"><figcaption><p>Immediate refresh</p></figcaption></figure>

* Ideal if you have just updated the underlying data and need to see the changes reflected instantly for ad-hoc analyses or quick data validations.
* Click **Run** to start the refresh process immediately.
* Tellius fetches fresh data right away, ensuring you see the latest information in your insights and dashboards.

#### One-Time Refresh

<figure><img src="https://content.gitbook.com/content/8GaK1h3pmgbR63x0ftET/blobs/VgPCpezJzlCVAXozCL2p/image.png" alt="" width="563"><figcaption><p>One-time refresh</p></figcaption></figure>

* Useful if you want to ensure data is refreshed overnight or just before a big presentation, without setting up an ongoing schedule.
* Provide a **Name** for this one-time refresh task.
* Set the **Start Date, Start Time and Time Zone** to specify exactly when the refresh should occur.
* Click **Save** to schedule the refresh.
* Tellius will automatically refresh the dataset(s) at the specified time—just once. This can be tracked under **Notifications**.

#### Periodic Refresh (Recurring Schedule)

<figure><img src="https://content.gitbook.com/content/8GaK1h3pmgbR63x0ftET/blobs/6yXBig8rGUs7EGMXkikq/image.png" alt="" width="563"><figcaption><p>Periodic refresh</p></figcaption></figure>

1. Ideal if you want daily or weekly refreshes to maintain continuously fresh data for ongoing analytics. Ensures data is always up-to-date without manual intervention.
2. Enable **TurnOnPeriodic Refresh** by toggling the switch.
3. Choose a **Frequency** (e.g., daily, weekly, monthly) from the dropdown.
4. Set the **Start Date**, **Start Time**, and **Time Zone** for the first occurrence. The dataset will refresh at this frequency starting from the given date and time.
5. Provide a **Name** for the refresh schedule.
6. Click **Save** to confirm.
7. Tellius sets up a recurring schedule. The datasource refreshes automatically at the chosen intervals, keeping your analysis current without manual triggers.

### Best Practices

* If you’re unsure of your latest data’s availability, run an immediate refresh first. This confirms that everything works before scheduling.
* If refreshes take longer than expected, consider adjusting the frequency or refreshing fewer datasets at once to optimize performance.