db.collection.dataSize()¶

db.collection.dataSize()¶

mongo Shell Method方法

This page documents the mongo shell method, and does not refer to the MongoDB Node.js driver (or any other driver) method. 此页面记录了mongoShell方法，未提及MongoDB Node.js驱动程序（或任何其他驱动程序）方法。For corresponding MongoDB driver API, refer to your specific MongoDB driver documentation instead.有关相应的MongoDB驱动程序API，请参阅特定的MongoDB驱动程序文档。

Returns:	The size in bytes of the collection.集合的大小（以字节为单位）。 Data compression does not affect this value.数据压缩不影响此值。

This method provides a wrapper around the size output of the collStats (i.e. db.collection.stats()) command.此方法为collStats（即db.collection.stats()）命令的size输出提供包装。

Starting in MongoDB 4.4, to run on a replica set member, collStats operations require the member to be in PRIMARY or SECONDARY state. 从MongoDB 4.4开始，要在副本集成员上运行，collStats操作要求该成员处于PRIMARY或SECONDARY状态。If the member is in another state, such as STARTUP2, the operation errors.如果成员处于另一种状态，如STARTUP2，则操作错误。

In previous versions, the operations can also be run when the member is in STARTUP2. 在以前的版本中，当成员在STARTUP2中时，也可以运行这些操作。However, the operations wait until the member transitions to RECOVERING.但是，这些操作将等待成员转换为RECOVERING。