July 2009
Intermediate to advanced
400 pages
16h 42m
English
Content preview from Principles of Transaction Processing, 2nd Edition
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Chapter 8
Two-Phase Commit
8.1 Introduction
The previous chapter showed how to use logging to ensure that a transaction is atomic with respect to failures, provided that the transaction updates data only in one resource manager. If two or more resource managers process updates for a transaction, then another technique is needed to ensure that the transaction commits at all resource managers or at none of them. This is called the two-phase commit protocol. Chapter 1 briefly introduced the protocol. This chapter develops it in more detail.
The main goal of the protocol is to ensure that a transaction either commits at all the resource managers that it accessed or aborts at all of them. The undesirable outcome that the protocol avoids is that the ...
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