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Oracle in a Nutshell
book

Oracle in a Nutshell

by Rick Greenwald, David C. Kreines
December 2002
Intermediate to advanced content levelIntermediate to advanced
928 pages
85h 29m
English
O'Reilly Media, Inc.
Content preview from Oracle in a Nutshell

EXPLAIN PLAN

The Oracle optimizer should select the best execution plan for SQL statements. If there is a problem with the performance of a SQL statement, you may want to see the execution path choices the optimizer made for the statement. The EXPLAIN PLAN statement can produce this information.

Tip

The execution plan produced by the EXPLAIN PLAN statement may not exactly match the execution plan used at runtime, because of differences in the two environments. The SQL_PLAN data dictionary views, new in Oracle9i, contain information about the actual execution plan used at runtime. See Chapter 6 for more information about these views.

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Publisher Resources

ISBN: 0596003366Errata Page