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Setting the Trace Initialization Parameters
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Collecting trace statistics imposes a performance penalty, and consequently the database doesn t automatically trace all sessions. Tracing is purely an optional process that you turn on for a limited duration to capture metrics about the performance of critical SQL statements. You need to look at four initialization parameters to set up Oracle correctly for SQL tracing, and you have to restart the database after checking that the following parameters are correctly configured. Three of these parameters are dynamic session parameters, and you can change them at the session level.
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The STATISTICS_LEVEL parameter can take three values. The value of this parameter has a bearing on the TIMED_STATISTICS parameter. You can see this dependency clearly in the following summary: If the STATISTICS_LEVEL parameter is set to TYPICAL or ALL, timed statistics are collected automatically for the database. If STATISTICS_LEVEL is set to BASIC, then TIMED_STATISTICS must be set to TRUE for statistics collection. Even if STATISTICS_LEVEL is set to TYPICAL or ALL, you can keep the database from tracing by using the ALTER SESSION statement to set TIMED_STATISTICS to FALSE.
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The TIMED_STATISTICS parameter is FALSE by default, if the STATISTICS_LEVEL parameter is set to BASIC. In a case like this, to collect performance statistics such as CPU and execution time, set the value of the TIMED_STATISTICS parameter to TRUE in the init.ora file or SPFILE, or use the ALTER
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CHAPTER 19 IM PR OVING DA TA BAS E PERFORM ANC E: S QL QUE RY OPTIMIZA TION
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SYSTEM SET TIMED_STATISTICS=TRUE statement to turn timed statistics on instance-wide. You can also do this at the session level by using the ALTER SESSION statement as follows: SQL> ALTER SESSION SET timed_statistics = true; Session altered. SQL>
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USER_DUMP_DEST is the directory on your server where your SQL Trace files will be sent. By default you use the $ORACLE_HOME/admin/database_name/udump directory as your directory for dumping SQL trace files. If you want non-DBAs to be able to read this file, make sure the directory permissions authorize reading by others. Alternatively, you can set the parameter TRACE_FILES_PUBLIC=TRUE to let others read the trace files on UNIX systems. Make sure the destination points to a directory that has plenty of free space to accommodate large trace files. USER_DUMP_DEST is a dynamic parameter, so you can also change it using the ALTER SYSTEM command, as follows: SQL> ALTER SYSTEM SET user_dump_dest='c:\oraclent\oradata'; System altered. SQL>
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Note
In Oracle Database 11g, if you set the new DIAGNSOTIC_DEST initialization parameter, the database ignores the USER_DUMP_DEST setting. The directory you set for the DIAGNOSTIC_DEST parameter determines where the database will place the trace files.
MAX_DUMP_FILE_SIZE
Some traces could result in large trace files in a big hurry, so make sure your MAX_DUMP_FILE_SIZE initialization parameter is set to a high number. The default size of this parameter may be too small for some traces. If the trace fills the dump file, it won t terminate, but the information in the file will be truncated.
Enabling SQL Trace
To use SQL Trace and TKPROF, first you need to enable the Trace facility. You can do this at the instance level by using the ALTER SESSION statement or the DBMS_SESSION package. You can trace the entire instance by either including the line SQL_TRACE=TRUE in your init.ora file or SPFILE or by using the ALTER SYSTEM command to set SQL_TRACE to TRUE. Tracing the entire instance isn t recommended, because it generates a huge amount of tracing information, most of which is useless for your purpose. The statement that follows shows how to turn tracing on from your session using the ALTER SESSION statement: SQL> ALTER SESSION SET sql_trace=true; Session altered. SQL> The following example shows how you set SQL_TRACE to TRUE using the DBMS_SESSION package: SQL> EXECUTE sys.dbms_session.set_sql_trace(true); PL/SQL procedure successfully completed. SQL>
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