0 votes 0 votes question about concurrency control methods Databases transaction-and-concurrency databases concurrency 2phaselocking + – jayadev asked Jul 2, 2022 jayadev 347 views answer comment Share Follow See 1 comment See all 1 1 comment reply farmanahmed888 commented Jan 6, 2022 reply Follow Share https://gateoverflow.in/223561/Self-doubt (for option a)thomas write rule allows(to be precise it ignores) obsolete writes.where as in time stamping protocol when we encounter obsolete writes we rollback that transaction.therefore, concluding that if a transaction has no OBSOLETE writes it is both time stamping protocol and thomas write rule applicable.if it has an obsolete write it will not be processed by time stamping protocol, but thomas write rule will allow it.to conclude, every schedule is allowed under basic time stamping protocol is also allowed by thomas write rule. 2 votes 2 votes Please log in or register to add a comment.