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One where every transaction reads only the items that are written by committed transactions.

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12y ago

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Are serial schedules recoverable or cascadeless?

It depends. A serial schedule is one in which the operations of one transaction begins after the operation of another.. that is for example there are 5 operations in Ti(Oi1,Oi2,Oi3,Oi4,Oi5) and 4 operations in Tj(Oj1,Oj2,Oj3,Oj4) the schedule is : Oi1,Oi2,Oi3,Oi4,Oi5,Oj1,Oj2,Oj3,Oj4 OR Oj1,Oj2,Oj3,Oj4,Oi1,Oi2,Oi3,Oi4,Oi5 But to check if a schedule is recoverable we need to check whether for each pair of transactions ,Ti and Tj - such that Tj reads a dataItem previously written by Ti - Ti commits before Tj. If so it is recoverable. All cascadeless Schedules are also recoverable Schedules


What benefits does strict two phase locking provide and What disadvantages result?

ADVANTAGE: It produces only cascadeless schedules, recovery is very easy.DISADVANTAGE: The set of schedules obtainable is a subset of those obtainable from plaintwo phase locking, thus concurrency is reduced


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