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Oracle SQL execution statistics with SQL*Plus autotrace command

Oracle Database Tips by Donald Burleson

For any specific SQL query you can see SQL execution performance statistics.  In SQL*Plus you can issue the "set autotrace" command and then issue your SQL statement:

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

Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 TABLE ACCESS (BY INDEX ROWID) OF 'EMP'
2 1 INDEX (UNIQUE SCAN) OF 'PK_EMP' (UNIQUE)


Statistics
----------------------------------------------------------
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

 

The SQL*Plus autotrace command supports the following options:

on - Enables all options.

on explain - Displays returned rows and the explain plan.

on statistics - Displays returned rows and statistics.

trace explain - Displays the execution plan for a select statement without actually executing it.
set autotrace trace explain

traceonly - Displays execution plan and statistics without displaying the returned rows. This option should be used when a large result set is expected.

For even more detailed SQL execution statistics, see the TKPROF (SQL Trace) utility.

Oracle tkprof Utility

Oracle TKPROF SQL_TRACE Setup

 

[http://dba-oracle.com/include_tuning_book3.htm]

 


 

 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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