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Tom Kyte of Oracle Magazine’s “Ask Tom” column has written the definitive guide to designing and building high-performance, scalable Oracle applications. The book covers schema design, SQL and PL/SQL, tables and indexes, and much more. From the exclusive publisher of Oracle Press books, this is a must-have resource for all Oracle developers and DBAs.
Very good reading for Application developers using Oracle as database. It is little outdated it refers to Oracle 9i, there are major changes in Oracle 10g, Still it is very good reading. It explain how SQL is executed, how to interpret explain plan, what are the tools available for investigating performance issues. etc.