> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-vortex-format.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> 关于 ClickPipes for BigQuery 的常见问题。

# ClickPipes for BigQuery 常见问题

<h3 id="time-travel-window-exceeded">
  我的 ClickPipe 失败并报错“change history start time is before allowed time travel interval”
</h3>

[`APPENDS`](https://docs.cloud.google.com/bigquery/docs/reference/standard-sql/time-series-functions#appends) 和 [`CHANGES`](https://docs.cloud.google.com/bigquery/docs/reference/standard-sql/time-series-functions#changes) 只能读取源表[时间旅行窗口](https://docs.cloud.google.com/bigquery/docs/time-travel)内的变更，该窗口默认为七天。如果 ClickPipe 的滞后时间超出该窗口，BigQuery 中将不再保留其所需的变更数据。此时请重新同步该 ClickPipe，使其恢复运行。