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ES中的三种查询_es数据库怎么查询数据_白帆瀚宇的博客-CSDN博客

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By searchScroll Request.scroll, notEmpty Ids, clearScroll Response.isSucceeded
| CSDN
Es有三种查询方式,不知道你平时工作中用到的是哪种呢? 一、from+Size 1、深度分页或者size特别大的时候,会出现deep pagination问题.并且因为Es自身的保护机制(max_result_window是10000),如果查出来的数据量大于10000的就会报错. 2、该查询的实际原理类似于mysql中的limit,比如查询第10001条数据,那么需要将前面的10000条都拿出来,进行过滤,最终才得到数据(性能比较差,实现简单,适用于少量数据). 二、scroll 1、高效进行滚动查询,首次查询会在内存中保存一个历史快照以及游标(scroll_id),记录当前消息查询的终止位置,下次查询的时候将基于游标进行消费(性能良好,不具备实施性,一般是用于大量数据导出或索引重建) 2、可以查询10000条以上数据. 3、当使用完查询的数据之后,记得要手动清理,因为scroll查询会生成快照,虽然会有过期时间,但是如果并发访问量激增的时候,都没达到过期时间,就会导致内存溢出.
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