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Oracle SQL Tuning with Oracle SQLTXPLAIN: Oracle Database 12c Edition, Second Edition
book

Oracle SQL Tuning with Oracle SQLTXPLAIN: Oracle Database 12c Edition, Second Edition

by Stelios Charalambides
April 2017
Intermediate to advanced
436 pages
12h 7m
English
Apress
Content preview from Oracle SQL Tuning with Oracle SQLTXPLAIN: Oracle Database 12c Edition, Second Edition

© Stelios Charalambides  2017

Stelios Charalambides, Oracle SQL Tuning with Oracle SQLTXPLAIN, 10.1007/978-1-4842-2436-6_7

7. Tracing CBO Decisions, Hints, and Query Transformations Using 10053

Stelios Charalambides1 

(1)New Hampton, New Hampshire, USA

The Oracle query optimizer is an amazing piece of code, developed and improved over the years to generate execution plans that are both easy to generate and that run fast. The optimizer uses a number of “tricks” along the way to improve the speed of execution and implements the execution plan in a way that gives the same results as your unmodified SQL. These “tricks” (or heuristics) sometimes include query transformations.

Query transformations, as the name implies, change the SQL query from its original ...

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ISBN: 9781484224359Purchase book