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OCP Instructors Guide for Oracle DBA Certification

Chapter 7 - Tuning and Performance

 Using Explain Plan to Determine Access Paths

2.1 NESTED LOOPS
            3.1 NESTED LOOPS
                        4.1 TABLE ACCESS FULL PUBLISHER_REP_FIRM
                        4.2 TABLE ACCESS BY ROWID APPROVAL_STATUS
                                    5.1 INDEX UNIQUE SCAN
PK_APPROVAL_STATUS UNIQUE
            3.2 TABLE ACCESS BY ROWID PUBLISHER_APP
                        4.1 INDEX UNIQUE SCAN PK_PUBLISHER_APP UNIQUE

It is easier to understand the access path if you take the output and draw or graph the access path’s steps (refer to figure 10). The statement above would produce the following graphical access path display:

Figure 10: Access path steps.

Let's take a few moments to review the above access path. Although you draw the operations from the top down and left to right, Oracle will execute the operations from the left to right and then bottom to top:

  • Operation 4.1 – Oracle is performing a full table scan on the outer-table


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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