# Sync schedule The primary function of a data pipeline is to keep two environments synchronized. To achieve this, pipelines rely on scheduled data update executions. These schedules are typically based on a specific **time** and an **update frequency**. ## Base hour The **Base Hour** refers to the specific time of day at which a scheduled pipeline execution begins, serving as the anchor point for the selected update frequency (e.g., weekly, daily, or every 12 hours). All subsequent executions follow this base hour based on the defined frequency. ## Frequency The available update frequencies on the Alexandria platform are: * **Manually:** Executes only when trigged by user. * **Weekly**: Executes once every week. * **Daily**: Executes every 24 hours. * **Every 12 Hours**: Executes every 12 hours. * **Every 6 Hours**: Executes every 6 hours. * **Every 3 Hours**: Executes every 3 hours. * **Every Hour**: Executes every 1 hour. * **Every 30 Minutes**: Executes every 30 minutes. * **Every 5 Minutes**: Executes every 5 minutes. ## Using sync frequencies and base hour {% embed url="" %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.erathos.com/platform/connections/sync-schedule.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.