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Writing efficient SQL
This tutorial is concerned with the techniques for ensuring that your SQL executes efficiently.  We will examine the problem of multiple solutions to SQL queries and shows the guidelines used for writing efficient SQL.  In order to evaluate the efficiency of an SQL statement, the student must learn how to view the execution plan for the SQL statement, and understand how to interpret the output from an execution plan.
The student must also understand the tkprof utility and understand how tkprof is used to display the amount of time spent parsing, execution and fetching for the SQL statement.
The writing of efficient SQL also includes a full understanding of Oracle’s automatic query re-write facility, and those conditions where Oracle dynamically restructures Oracle queries to improve execution plans.
The student will also understand Oracle materialized views and see how the creation of a materialized view can dramatically improve SQL performance.  The student will also be exposed to the materialized view re-write options including EXACT and SIMILAR.
As a database administrator, the student must also be able to review the SQL from the developer and end-user community and become proficient in evaluating and restructuring the query to improve performance.
This chapter will also examine efficient PL/SQL coding techniques.
Upon completion of this tutorial, you will be able to:
  • Use temporary tables to improve SQL performance
  • Learn to implement query re-write within an Oracle database
  • Describe and use Materialized views
  • Learn Oracle index structures
  • Implement techniques for indexing strategies



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