[英]Specify `max` Without `size` when Creating MongoDB Capped Collection
When trying to create a MongoDB capped collection with only a limit for the max number of documents and not a size limit (not sure how large will all the documents be), pymongo
is giving the error 当试图创建一个MongoDB上限的集合时,其最大文档数没有限制,而没有大小限制(不确定所有文档的大小), pymongo
会给出错误
pymongo.errors.OperationFailure: specify size:<n> when capped is true
after running 跑步后
db.create_collection('helloworld', capped=True, max=86400)
Is it possible to just define the max
parameter? 是否可以仅定义max
参数?
Otherwise, is there any danger in putting a very large number for size
? 否则,有没有把一个非常大的数字对于任何危险size
?
The size argument is always required, even when you specify max number of documents. 即使您指定最大文档数,也始终需要size参数。 MongoDB will remove older documents if a collection reaches the maximum size limit before it reaches the maximum document count. 如果集合在达到最大文档数之前达到最大大小限制,MongoDB将删除较旧的文档。
MongoDB pre-allocates data files of the requested maximum size, so set that size parameter to something reasonable. MongoDB预分配了请求的最大大小的数据文件,因此请将size参数设置为合理的值。
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