2 votes 2 votes Is different 2 phase locking a subset of each other? For example, if the schedule is Strict 2PL then it will also be simple 2PL. Something like a 2PL is a subset of Strict 2PL is a subset of rigorous 2PL. Databases databases 2phaselocking transaction-and-concurrency concurrency + – vinay chauhan asked Jan 18, 2019 vinay chauhan 575 views answer comment Share Follow See 1 comment See all 1 1 comment reply Fyse commented Jan 18, 2019 reply Follow Share All schedules possible under Rigorous 2PL are also possible under Strict 2PL and Basic 2PL. All schedules possible under Strict 2PL are also possible under Basic 2PL. Hence, Rigorous 2PL $\subset$ Strict 2PL $\subset$ Basic 2PL 5 votes 5 votes Please log in or register to add a comment.