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A comment on Ask HN: Posgresql JSON or MongoDB?. Parent comment

Re:Ask HN: Posgresql JSON or MongoDB? by maerF0x0 on Tuesday May 09, 2017 @10:19PM (#14305477)
Mongo seems to lock on various granularities. Sounds like collection ("table") is common and with WiredTiger engine (default iirc) it goes to document locking ("row").

https://docs.mongodb.com/manual/faq/concurrency/

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Re:Ask HN: Posgresql JSON or MongoDB? by weishan on Thursday May 11, 2017 @04:27PM (#14319211)
WT is the default storage engine and it locks at document level ("row")
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