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Don Burleson Blog 








Reading SQL 10053 trace files

Oracle Database Tips by Donald Burleson

Many people need to understand how to set and use the 10053 trace event (SQL trace) to get detailed execution information about a SQL statement. 

The following text is an excerpt from the bestselling book
"Oracle PL/SQL Tuning: Expert Secrets for High Performance Programming" by Dr. Tim Hall, Oracle ACE of the year, 2006.

The command to dump the optimizer statistics whenever a SQL statement is parsed can be done at many levels:


EXEC DBMS_SESSION.set_sql_trace(sql_trace => TRUE);

ALTER SESSION SET EVENTS '10046 trace name context forever, level 8';

EXEC DBMS_SYSTEM.set_sql_trace_in_session(sid=>123, serial#=>1234, sql_trace=>TRUE);

EXEC DBMS_SYSTEM.set_ev(si=>123, se=>1234, ev=>10046, le=>8, nm=>' ');

In Oracle 10g we see new ways to enable SQL tracing:

SQL> EXEC DBMS_MONITOR.session_trace_enable;
SQL> EXEC DBMS_MONITOR.session_trace_enable(waits=>TRUE, binds=>FALSE);

SQL> EXEC DBMS_MONITOR.session_trace_enable(session_id=>1234, serial_num=>1234);
SQL> EXEC DBMS_MONITOR.session_trace_enable(session_id =>1234, serial_num=>1234, waits=>TRUE,

SQL> EXEC DBMS_MONITOR.client_id_trace_enable(client_id=>'tim_hall');
SQL> EXEC DBMS_MONITOR.client_id_trace_enable(client_id=>'tim_hall', waits=>TRUE,

SQL> EXEC DBMS_MONITOR.serv_mod_act_trace_enable(service_name=>'db10g',
module_name=>'test_api', action_name=>'running');

SQL> EXEC DBMS_MONITOR.serv_mod_act_trace_enable(service_name=>'db10g',
module_name=>'test_api', action_name=>'running', waits=>TRUE, binds=>FALSE);

SQL> EXEC DBMS_MONITOR.serv_mod_act_trace_disable(service_name=>'db10g', module_name=>'test_api', action_name=>'running');

Note that the 10053 trace event output files can get huge, especially for SQL statements that touch thousands of rows.  Here are step-by-step details for using the 10053 SQL trace event:

Alternatives to SQL trace with 10053

Oracle has an more detailed script alternative to the 10053 trace called SQLTXPLAIN.SQL - Enhanced Explain Plan and related diagnostic info for one SQL statement.

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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