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OCP Instructors Guide for Oracle DBA Certification

Chapter 7 - Tuning and Performance

Explain Plan Output

The Oracle Database Performance Tuning (1Z0-033) certification test will have multiple questions on Explain.  Test candidates should have a firm understanding of:

  • What explain tables are used for and how the simplify SQL statement tuning
     

  • How to create an explain table
     

  • The basic columns contained in the explain table
     

  • How to retrieve the contents of the explain table
     

  • How to interpret the information retrieved from the explain table

SQL*PLUS AUTOTRACE

The SQL*PLUS AUTOTRACE command can be used to create a report of the execution path used by a particular SQL statement. Statement execution statistics can also be generated if desired. This is my favorite explain tool because it’s a quick and easy way to display the access path the query is taking. The following parameters are used as input to AUTOTRACE to generate different report output:

  • SET AUTOTRACE OFF- No AUTOTRACE report is generated. This is the default.
     

  • SET AUTOTRACE ON EXPLAIN - The AUTOTRACE report shows only the optimizer execution path.
     

  • SET AUTOTRACE ON STATISTICS - The AUTOTRACE report shows only the SQL statement execution statistics.
     

  • SET AUTOTRACE ON - The AUTOTRACE report includes both the optimizer execution path and the SQL statement execution statistics.
     

  • SET AUTOTRACE TRACEONLY - Like SET AUTOTRACE ON, but suppresses the printing of the user's query output, if any.
     


The above text is an excerpt from:


OCP Instructors Guide for Oracle DBA Certification
A Study Guide to Advanced Oracle Certified Professional Database
Administration Techniques

ISBN 0-9744355-3-8

by Christopher T. Foot
 

http://www.rampant-books.com/book_2003_2_OCP_print.htm


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