MongoDB并发

Question

I'm a little confused about MongoDB's read locking. How many concurrent read operations can a single collection support?

Answer 1

您可以在此处查看： http ： //www.mongodb.org/pages/viewpage.action？pageId = 7209296

Answer 2

As written in the link given by tk : http://www.mongodb.org/pages/viewpage.action?pageId=7209296

Read/Write Lock

mongod uses a read/write lock for many operations. Any number of concurrent read operations are allowed , but typically only one write operation (although some write operations yield and in the future more concurrency will be added). The write lock acquisition is greedy: a pending write lock acquisition will prevent further read lock acquisitions until fulfilled.

Typical read/write lock