Chapter 15
Protecting Data
In This Chapter
Avoiding database damage
Understanding the problems caused by concurrent operations
Dealing with concurrency problems through SQL mechanisms
Tailoring protection to your needs with SET TRANSACTION
Protecting your data without paralyzing operations
Everyone has heard of Murphy’s Law — usually stated, “If anything can go wrong, it will.” People joke about this pseudo-law because most of the time things go fine. At times, you may feel lucky because you’re untouched by what purports to be one of the basic laws of the universe. When unexpected problems arise, you probably just recognize what has happened and deal with it.
In a complex structure, the potential for unanticipated problems shoots way up. (A mathematician might say it “increases approximately as the square of the complexity.”) Thus large software projects are almost always delivered late and are often loaded with bugs. A nontrivial, multiuser DBMS application is a large, complex structure. ...
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