Firestore:如何“读取"数据?计算配额? [英] Firestore: How are "reads" calculated for the quota?

问题描述

我不明白"firestore"如何计算配额和账单的读取次数.

I don't understand the way "firestore" counts the reads for the quota and billing.

示例:我有一个包含200'000个文档的集合.每个文档都有一个时间戳作为属性.现在，我想在过去一小时内得到所有文件.因此，我创建了一个查询，该查询为我提供了所有带有时间戳> now()-60分钟"的文档.结果是一组10个文档. Firestore是否为此计算10个文档读取或200'000个文档读取? 我想建立一个查询，该查询总是读取一次文档(获取而不是实时).

Example: I have a collection with 200'000 documents. Every document has a timestamp as attribute. Now I would like to get all documents within the last hour. So I create a query which gives me back all documents with "timestamp > now()-60 minutes". The result is a set of 10 documents. Does Firestore counts 10 document reads or 200'000 documents read for this? I would like to build a query that read a document always once (fetch, not real time).

我认为Firestore乍一看只是比其他解决方案(例如Google Cloud sql，aws等)便宜的解决方案.

I assume that firestore is only at the first view a cheaper solution than with other solution (e.g. google cloud sql, aws etc).

推荐答案

要允许该查询，您需要在timestamp上具有索引. Firestore使用该索引来确定要返回的文档.因此，这将算作10次文档读取.

To allow that query, you will need to have an index on timestamp. Firestore uses that index to determine what documents to return. So this would count as 10 document reads.

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