A Semantic Approach to Correctness of Concurrent Transaction Executions
A Semantic Approach to Correctness of Concurrent Transaction Executions
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In our eReader you can find the full English version of the book. Read A Semantic Approach to Correctness of Concurrent Transaction Executions Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Semantic Approach to Correctness of Concurrent Transaction Executions
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Definition . A schedule S is independent iff each transaction T of S is independent in S. Let I be the class of Independent schedules. Definition . A schedule is correct iff (1) it is independent (2) it preserves ICs, and (3) it has no racing. Let C be the class of correct schedules. The following proposition is immediate. -13- Proposttlon . Independent schedules cannot produce Inconsistent outputs to the user. However, the Inverse is not true. Here Is a counterexample: 1 Tl T2 1 1 rA 1 rB rA 1... rB 1 A := A - A 1 wA ! 1 rA B := B + A 1 wB 1 1 output B T, produces a consistent output but it cannot be independent. Here, this happens because of multiple reads allowed to be in sequence in a transaction. Therefore, our class, C, of correct schedules is a subset of the class of schedules without inconsistencies. (If we were following the approach of defining independence in terms of transaction external writes, we would have captured, in the class of correct schedules, all the schedules which avoid all types of inconsistencies.
What to read after A Semantic Approach to Correctness of Concurrent Transaction Executions?
You can find similar books in the "Read Also" column, or choose other free books by Paul G Spirakis to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Definition . A schedule S is independent iff each transaction T of S is independent in S. Let I be the class of Independent schedules. Definition . A schedule is correct iff (1) it is independent (2) it preserves ICs, and (3) it has no racing. Let C be the class of correct schedules. The following proposition is immediate. -13- Proposttlon . Independent schedules cannot produce Inconsistent outputs to the user. However, the Inverse is not true. Here Is a counterexample: 1 Tl T2 1 1 rA 1 rB rA 1... rB 1 A := A - A 1 wA ! 1 rA B := B + A 1 wB 1 1 output B T, produces a consistent output but it cannot be independent. Here, this happens because of multiple reads allowed to be in sequence in a transaction. Therefore, our class, C, of correct schedules is a subset of the class of schedules without inconsistencies. (If we were following the approach of defining independence in terms of transaction external writes, we would have captured, in the class of correct schedules, all the schedules which avoid all types of inconsistencies.
What to read after A Semantic Approach to Correctness of Concurrent Transaction Executions?
You can find similar books in the "Read Also" column, or choose other free books by Paul G Spirakis to read onlineMoreLess
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