问题描述
对于诸如以下查询之类的查询，对于Firestore定价是一次读取还是25次读取，我有些困惑.
I am a bit confused as to whether a query like the one below counts as one read or 25 reads for Firestore pricing ?
queryRef.limit(25).get().then(()=>{
...
});
我了解到，在定价图表中，文档读取"已定义为单元，但对于上述查询我有些困惑，需要确认.
I understand that in the pricing chart a "document read" has been defined as the unit but I am a bit confused about a query like above and need a confirmation.
推荐答案
如果查询返回1个文档，则将向您收取1次读取的费用.如果查询返回25个文档，则将向您收取25次读取的费用.在查询中，文档没有被读取"的内容，在使用偏移量跳过文档的情况下，例外除外.根据文档:
If your query returns 1 document, you will be charged 1 read. If your query returns 25 documents, you will be charged 25 reads. A document does not have the be "read" to be omitted in a query, except in the case of using an offset to skip documents. According to the documentation:
但是，当您发送包含偏移量的查询时， 为每个跳过的文档收费.例如，如果您的查询 使用10的偏移量，查询返回1个文档，您是 收取11次读取.由于这笔额外费用，您应该使用 游标而不是偏移量.
However, when you send a query that includes an offset, you are charged a read for each skipped document. For example, if your query uses an offset of 10, and the query returns 1 document, you are charged for 11 reads. Because of this additional cost, you should use cursors instead of offsets whenever possible.
这篇关于Firestore读/写定价； .limit(25)算作25次读取还是一次?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！