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Don Burleson Blog 








Using SQL*Plus autotrace

Oracle Database Tips by Donald Burleson

Rather than using the cumbersome "explain plan" syntax to display a SQL execution plan, Oracle has the autotrace SQL*Plus utility to make it easy to see SQL execution plans. I have a several hundred pages on SQL tracing in my book "Oracle Tuning: The Definitive Reference".

The SQL*Plus autotrace command has these options:

  • set autotrace traceonly - executes the SQL but does not display the result
  • set autotrace trace explain - Displays the execution plan for a select statement without executing the SQL.

You can do a autotrace traceonly explain to see the execution plan plus execution statistics:

SQL> set autotrace traceonly explain
SQL> select ename from emp where empno = 12;

Execution Plan

83 recursive calls
0 db block gets
21 consistent gets
3 physical reads
0 redo size
221 bytes sent via SQL*Net to client
368 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
0 rows processed

If you like Oracle tuning, see the book "Oracle Tuning: The Definitive Reference", with 950 pages of tuning tips and scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



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