Http-x is the sink side. How do I execute insert statements every few seconds?

### Search before asking

- [ ] I had searched in the [issues](https://github.com/DTStack/chunjun/issues) and found no similar question.

- [ ] I had googled my question but i didn't get any help.

- [ ] I had read the documentation: [ChunJun doc](https://dtstack.github.io/chunjun) but it didn't help me.

### Description

emqx为source端；
http为sink端；
从emqx计算数据到http；
但是emqx的数据量巨大，http请求是更新数据库的数据，如果每次都处理数据，对http服务器是一个很大的压力，对数据库也有可能造成死锁的情况！！
因此，我需要每隔几秒，执行一次insert into sink select * from source!
我该怎么做，才行？

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