db.collection.dataSize()

db.collection.dataSize()

Important重要

mongosh Method

This is a mongosh method. This is not the documentation for Node.js or other programming language specific driver methods.

In most cases, mongosh methods work the same way as the legacy mongo shell methods. However, some legacy methods are unavailable in mongosh.

For the legacy mongo shell documentation, refer to the documentation for the corresponding MongoDB Server release:

• mongo shell v4.4
• mongo shell v4.2
• mongo shell v4.0

For MongoDB API drivers, refer to the language specific MongoDB driver documentation.

Returns:返回：	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.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.如果成员处于其他状态，例如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，当成员位于STARTUP2中时，也可以运行这些操作。However, the operations wait until the member transitions to RECOVERING.但是，操作会一直等到成员转换到RECOVERING。