Root Cause

造成该问题主要是因为已经在使用的表在后续变更中，加入了限制文档大小或者限制文档数量的mete数据，该模型会成为Capped Collection模型，但已经存在的表并不会变更，所以用Capped Collection模型向非Capped Collection数据表中写数据，就会此报错误。

解决方法

drop旧表 create新表

如果数据仍需保留，则可以在mongo shell中采用滚动覆盖的方法更新该表.

db.<collection_name>.find().forEach(function(doc){ db.<collection_name>.insert(doc); });

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解决MongoDB报错：Cannot create collection “None“ as a capped collection as it already exist

解决MongoDB报错：Cannot create collection "None" as a capped collection as it already exist

Root Cause

解决方法

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