# At startup

**Category:** Trigger

**Version:** 1.0

**Last updated:** January 28, 2026

**Author:** Any2Info

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### Description

The **At Startup trigger** starts a dataflow automatically when the DataHub service starts.

When this trigger fires depends on how the DataHub is hosted:

* **Windows Service**\
  The trigger is raised when the Windows service is started or restarted.
* **IIS Website or Virtual Application**\
  The trigger is raised when the application pool is started or recycled.

This trigger executes **only once per application lifecycle**.\
While the DataHub remains running, the startup event will not be raised again.

If the DataHub fails to start and is restarted, the startup event is raised again.

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### Configuration Options

| Setting         | Required | Description                                                                                                                                                 |
| --------------- | -------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Repeat every    | No       | Enables repeated execution starting from the moment the DataHub has started. The interval supports Seconds, Minutes, Hours, Days, and Weeks.                |
| For duration of | No       | Defines how long the repeated executions should continue. Can be set to **Indefinitely** or a specific duration in Seconds, Minutes, Hours, Days, or Weeks. |
| Random delay    | No       | Adds a random delay before the first execution after startup. The delay value supports Seconds, Minutes, Hours, Days, and Weeks.                            |

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### Usage

Use the **At Startup trigger** when actions need to be performed automatically whenever the DataHub starts or restarts.

Typical use cases include:

* Informing an administrator or user that the DataHub has started
* Clearing caches when the DataHub restarts
* Testing external connections when the DataHub becomes available

This trigger can be used in **multiple dataflows**.\
All dataflows that use the At Startup trigger will be triggered when the DataHub starts.

A dataflow can contain **only one trigger**.

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### Tips & Best Practices

* Use **Random delay** when multiple startup-triggered dataflows perform heavy operations to avoid load spikes.
* Configure **Repeat every** only when repeated execution after startup is required.
* Do not assume this trigger will fire again unless the DataHub is restarted.

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### Changelog

| Version | Date             | Change                               |
| ------- | ---------------- | ------------------------------------ |
| 1.0     | January 28, 2026 | Initial documentation version added. |