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- W1608885646 abstract "Bbarat Bbar~ava Department of Computer Sciences Purdue University, West Lafayette IN 47907, USA bb@cs.purdue.edu Transactions consist of read and write operations. We incorporate <l prewrite operation before a write operation in a mobile trnnsaction to improve dala availability. A prewrite operation does not update the state of <l data object but only make visible the value the data object will have after the commit of the associaled uansacLion. Once a lransacLion received all the values read and dcclares all the prewrites, it can pre-commit at mobile host (i.e., computer connected to unreliable communication) and the remaining transaction's execution is shifted to the stationary host (Le., computer connected to the reliable fixed network). Writes on database after pre-commit L:lke time and re..<;ources <It stationary hOSL and are therefore, delayed. This reduces network traffic congesLion usually caused by update..<;. A pre-committed lIdIlsaction's prewrite values arc made visible both at mobile and stationary hosts before the final commit of the trallsaclion. This increase..<; data availabiliLy during frequent disconnection common ill mobile computing. Since the expensive part of the trdIlSllcLion execution is shifted to the smtionary host, it reduces the computing expenses (e.g., baLtery, low bandwidth, memory etc) at mobile host. Since a precommitted lransaclion does not abort, no undo recovery needs to be performed in our model. A mobile host can cache only prewrite values of Lhe data objects, which will take less space, time, energy and can be transmitted over low bandwidth." @default.
- W1608885646 created "2016-06-24" @default.
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- W1608885646 date "1997-01-01" @default.
- W1608885646 modified "2023-09-27" @default.
- W1608885646 title "Improving Data Availability in Mobile Computing Using Prewrite Operations" @default.
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