在appengine上查询响应大小限制？ [英] Query response size limit on appengine?

问题描述

Appengine文档提到对实体大小和批量获取请求（db.get（））的1Mb限制：
http://code.google.com/appengine/docs/python/datastore/overview.html

Appengine docs mention a 1Mb limit on both entity size and batch get requests (db.get()): http://code.google.com/appengine/docs/python/datastore/overview.html

对于单个fetch（）调用，查询返回的所有实体的总大小是否也有限制？

Is there also a limit on the total size of all entities returned by a query for a single fetch() call?

示例查询：

db.Model.all().fetch(1000)

更新：从1.4.0开始批量取消限制已被移除！

Update: As of 1.4.0 batch get limits have been removed!

• 尺寸和数量限制数据存储批处理get / put / delete操作已被
  删除。单个实体仍然限制为1 MB，但是您的应用程序
  可能为
  批次，因为整个
  数据存储区最后期限允许，所以多个实体一起进行get / put / delete调用。

推荐答案

Theres 对于查询可以返回的实体的数量不再是限制，而是相同的实体大小限制适用于实际检索/迭代实体时。然而，这只会在一个单一的实体上;它不是查询返回的所有实体的总大小的限制。

Theres no longer a limit on the number of entities that can be returned by a query, but the same entity size limit applies when you are actually retrieving / iterating over the entities. This will only be on a single entity at a time though; it is not a limit on the total size of all entities returned by the query.

底线：只要你没有一个大于1Mb的实体，你应该可以查询。

Bottom line: as long as you don't have a single entity that is > 1Mb you should be OK with queries.

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