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These schedules are recoverable. The schedule F is recoverable because T1 commits before T2, that makes the value read by T2 correct. Then T2 can commit itself. In the F2 schedule, if T1 aborted, T2 has to abort because the value of A it read is incorrect. In both cases, the database is left in a consistent state.
There are 181 scheduled CPSEs, i.e. 64 Schedule 'A', 68 Schedule 'B', 45 Schedule 'C' and 4 Schedule 'D' CPSEs. [1] S.No PSU Inc. Ministry Headquarters Sector Group
A precedence graph of the schedule D, with 3 transactions. As there is a cycle (of length 2; with two edges) through the committed transactions T1 and T2, this schedule (history) is not Conflict serializable. Notice, that the commit of Transaction 2 does not have any meaning regarding the creation of a precedence graph.
In databases and transaction processing, two-phase locking (2PL) is a pessimistic concurrency control method that guarantees conflict-serializability. [1] [2] It is also the name of the resulting set of database transaction schedules (histories).
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The tariff schedule has 99 chapters under 22 sections, and various appendices for chemicals, pharmaceuticals, and intermediate chemicals for dye.Raw materials or basic substances generally appear in the early chapters and in earlier headings within a chapter, whereas highly processed goods and manufactured articles appear in later chapters and headings.
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