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  One of the most important challenges faced by Oracle database  administrators and Oracle developers is the need to tune SQL  statements so that they execute efficiently. Poorly tuned SQL  statements are one of the leading causes of substandard database  performance and poor response time. SQL statements that perform  poorly result in frustration for users, and can even prevent a  company from serving its customers in a timely manner.  
In this book, Mark Gurry shares his in-depth knowledge of Oracle's  SQL statement optimizers. Mark's knowledge is the result of many  hard-fought tuning battles during his many years of providing Oracle  tuning services to clients. Mark provides insights into the workings  of the rule-based optimizer that go well beyond what the rules tell  you. Mark also provides solutions to many common problems that occur  with both the rule-based and cost-based optimizers.
In addition to the specific problem/solution scenarios for the optimizers,  Mark provides a number of handy SQL tuning tips. He discusses the various  optimizer hints, telling you when they can be used to good effect. Finally,  Mark discusses the use of the DBMS_STATS package to manage database statistics,  and the use of outlines to specify execution plans for SQL statements in  third-party applications that you can't otherwise modify.

   
  



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