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This article needs additional citations for Unsourced material may be challenged and removed.. The following example illustrates the interceding update problem: • A reads a customer from a file containing account information, including the customer's account balance and phone number.

• Process B, which still has the original stale value for the account balance in its copy of the customer record, updates the account balance and writes the customer record back to the file.. (February 2015) () File locking is a mechanism that restricts access to a by allowing only one or to access it in a specific time.. Most support the concept of, which means that individual records within any given file may be locked, thereby increasing the number of update processes.

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• Process B now reads the same record from the same file so it has its own copy.. • Process B has now written its stale account-balance value to the file, causing the changes made by process A to be lost.. • Process A changes the account balance in its copy of the customer record and writes the record back to the file. Download Emulador Psp Ps3

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Systems implement locking to prevent the classic interceding update scenario, which is a typical example of, by enforcing the serialization of update processes to any given file. normal video to hd converter download free for windows 10 64bit

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