May 2006
Intermediate to advanced
536 pages
15h 13m
English
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Chapter 9. Transactions
Transactions allow you to define a unit of activity that will be considered atomic–all or nothing. The data will be considered consistent at the beginning of the transaction and at the end. Locks are obtained to isolate data resources, preventing (blocking) other processes from performing incompatible activities against those resources. You can control the degree of isolation of your transaction by specifying an isolation level. I will describe isolation levels in more detail later in the chapter. The database’s transaction log guarantees that a committed transaction recorded within it is durable–that is, the change will reach the database. ...
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