I think parent is talking about things like MVCC[1] in contrast with simple read-write locks. [1] https://en.wikipedia.org/wiki/Multiversion_concurrency_contro

I think parent is talking about things like MVCC[1] in contrast with simple read-write locks. [1] https://en.wikipedia.org/wiki/Multiversion_concurrency_control https://en.wikipedia.org/wiki/Multiversion_concurrency_contr...