December 2003
Intermediate to advanced
448 pages
9h 5m
English
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2.15. Autotrace
AUTOTRACE is a SQL*Plus command that shows the execution plan for SQL statements. It is an excellent tool. We will see many options in Chapter 3 with regard to constraints, particularly primary key and unique constraints. These constraints have indexes. There are implications to actions that modify these constraints. In a development or test environment, developers may temporarily disable constraints or drop and create them. AUTOTRACE offers a quick check to see how your SQL will execute. You may assume that an index exists and that you are using it; and yet it may not. You learn when you run your application with disappointing performance.
Setting AUTOTRACE in your SQL*Plus session shows the execution path for all SQL statements ...
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