Title: perhaps chapters 7 and 8 are the most useful?
Review: Lawson gives the Oracle DBA many useful ideas on customising your Oracle database. He pretty much assumes you already possess a reasonable background in Oracle. There is no wasted space on elementary SQL or Oracle tasks.Perhaps the key chapters are 7, "Oracle Pathologist" and 8, "Analysing SQL Bottlenecks". Later chapters add important refinements. But if you are in search of quick gains, chapters 7 and 8 could be the most fruitful. The ideas in those might not have to involve a major overhaul of your architecture.
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