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Atomicity Either all operations of the transaction are re ected properly in the database, or none are Consistency Execution of a transaction in isolation (that is, with no other transaction executing concurrently) preserves the consistency of the database Isolation Even though multiple transactions may execute concurrently, the system guarantees that, for every pair of transactions Ti and Tj , it appears to Ti that either Tj nished execution before Ti started, or Tj started execution after Ti nished Thus, each transaction is unaware of other transactions executing concurrently in the system Durability After a transaction completes successfully, the changes it has made to the database persist, even if there are system failures These properties are often called the ACID properties; the acronym is derived from the rst letter of each of the four properties To gain a better understanding of ACID properties and the need for them, consider a simpli ed banking system consisting of several accounts and a set of transactions that access and update those accounts For the time being, we assume that the database permanently resides on disk, but that some portion of it is temporarily residing in main memory Transactions access data using two operations: read(X), which transfers the data item X from the database to a local buffer belonging to the transaction that executed the read operation write(X), which transfers the data item X from the the local buffer of the transaction that executed the write back to the database In a real database system, the write operation does not necessarily result in the immediate update of the data on the disk; the write operation may be temporarily stored in memory and executed on the disk later For now, however, we shall assume that the write operation updates the database immediately We shall return to this subject in 17 Let Ti be a transaction that transfers $50 from account A to account B This transaction can be de ned as Ti : read(A); A := A 50; write(A); read(B); B := B + 50; write(B) Let us now consider each of the ACID requirements (For ease of presentation, we consider them in an order different from the order A-C-I-D) Consistency: The consistency requirement here is that the sum of A and B be unchanged by the execution of the transaction Without the consistency requirement, money could be created or destroyed by the transaction! It can. asp.net upc-a UPC-A . NET Control - UPC-A barcode generator with free . NET ...
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6 Apr 2005 ... Demonstrates a method to draw UPC-A barcodes using C#. ... NET 2003 - 7.87 Kb. Image 1 for Drawing UPC-A Barcodes with C# ... The energy is given in joules At this point, it s a good idea to go back and compare the basic voltage current relation (612) and energy (615) for the inductor with the equations we found for the capacitor, (64) and (68) Notice that these equations have similar form, we just interchange L and C and v and i The McGraw Hill Companies, 2001 . FIGURE 2-10 asp.net upc-a Barcode UPC-A - CodeProject
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NET UPC-A Generator Controls to generate GS1 UPC-A barcodes in VB. NET , C# applications. Download Free Trial Package | Developer Guide included ... be veri ed easily that, if the database is consistent before an execution of the transaction, the database remains consistent after the execution of the transaction Ensuring consistency for an individual transaction is the responsibility of the application programmer who codes the transaction This task may be facilitated by automatic testing of integrity constraints, as we discussed in 6 Atomicity: Suppose that, just before the execution of transaction Ti the values of accounts A and B are $1000 and $2000, respectively Now suppose that, during the execution of transaction Ti , a failure occurs that prevents Ti from completing its execution successfully Examples of such failures include power failures, hardware failures, and software errors Further, suppose that the failure happened after the write(A) operation but before the write(B) operation In this case, the values of accounts A and B re ected in the database are $950 and $2000 The system destroyed $50 as a result of this failure In particular, we note that the sum A + B is no longer preserved Thus, because of the failure, the state of the system no longer re ects a real state of the world that the database is supposed to capture We term such a state an inconsistent state We must ensure that such inconsistencies are not visible in a database system Note, however, that the system must at some point be in an inconsistent state Even if transaction Ti is executed to completion, there exists a point at which the value of account A is $950 and the value of account B is $2000, which is clearly an inconsistent state This state, however, is eventually replaced by the consistent state where the value of account A is $950, and the value of account B is $2050 Thus, if the transaction never started or was guaranteed to complete, such an inconsistent state would not be visible except during the execution of the transaction That is the reason for the atomicity requirement: If the atomicity property is present, all actions of the transaction are re ected in the database, or none are The basic idea behind ensuring atomicity is this: The database system keeps track (on disk) of the old values of any data on which a transaction performs a write, and, if the transaction does not complete its execution, the database system restores the old values to make it appear as though the transaction never executed We discuss these ideas further in Section 152 Ensuring atomicity is the responsibility of the database system itself; speci cally, it is handled by a component called the transaction-management component, which we describe in detail in 17 Durability: Once the execution of the transaction completes successfully, and the user who initiated the transaction has been noti ed that the transfer of funds has taken place, it must be the case that no system failure will result in a loss of data corresponding to this transfer of funds The durability property guarantees that, once a transaction completes successfully, all the updates that it carried out on the database persist, even if there is a system failure after the transaction completes execution. asp.net upc-a UPC-A Barcode Generator for ASP . NET Web Application
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