Chapter 9. Transactions
In computing, the mean time to failure keeps getting shorter.
—Alan Perlis, Epigrams in Programming
In this chapter we are going to explore a fundamental tool for dealing with partial failure: transactions. Transactions provide a means of enforcing consistency over a set of (one or more) space-based operations. By consistency we mean that transactions allow space-based operations to be bundled together in such a way that either all complete, or none of them do—in other words, a set of operations will never be “half” completed.
An example can help in understanding the value of transactions. Consider our web counter example from Chapter 3—each time a web page is visited, an applet takes a page count entry, increments its ...
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