[Oracle] How to Use DBMS_SUPPORT Package

DBMS_SUPPORT是Oracle提供的一个软件包。供内部支持人员使用以更有效地跟踪SQL。这个包没有正式的说明文件，默认情况下，系统不安装这个包。如果需要使用的话，需进行单独设置。在你的$ORACLE_HOME/rdbms/admin/目录下应该存在dbmssupp.sql，prvtsupp.plb这两个文件。

SQL> connect / as sysdba                     
Connected.
SQL> @$ORACLE_HOME/rdbms/admin/dbmssupp.sql

Package created.

Package body created.

SQL>            

SQL> GRANT EXECUTE ON dbms_support TO PUBLIC;

Grant succeeded.

SQL> CREATE PUBLIC SYNONYM dbms_support FOR dbms_support;

SQL> desc DBMS_SUPPORT

FUNCTION MYSID RETURNS NUMBER
FUNCTION PACKAGE_VERSION RETURNS VARCHAR2
PROCEDURE START_TRACE
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 WAITS                          BOOLEAN                 IN     DEFAULT
 BINDS                          BOOLEAN                 IN     DEFAULT
PROCEDURE START_TRACE_IN_SESSION
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 SID                            NUMBER                  IN
 SERIAL                         NUMBER                  IN
 WAITS                          BOOLEAN                 IN     DEFAULT
 BINDS                          BOOLEAN                 IN     DEFAULT
PROCEDURE STOP_TRACE
PROCEDURE STOP_TRACE_IN_SESSION
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 SID                            NUMBER                  IN
 SERIAL                         NUMBER                  IN

SQL> 

SQL> SELECT SYS.dbms_support.mysid FROM DUAL;

     MYSID
----------
        25

SQL> 
SQL>SELECT SID, serial# FROM v$session WHERE SID = dbms_support.mysid;

       SID    SERIAL#
---------- ----------
        25       4328

SQL> 

SQL> SELECT dbms_support.package_version
  2  FROM dual;

PACKAGE_VERSION
--------------------------------------------------------------------
DBMS_SUPPORT Version 1.0 (17-Aug-1998) - Requires Oracle 7.2 - 8.0.5

这里的显示应该是个小Bug。也说明这个工具包不被Oracle支持，只是供内部人员使用。否则这样明显的问题应该早都修订了吧。

如何激活SQL跟踪? START_TRACE有两个参数：WAITS和BINDS。其中WAITS默认为TRUE,BINDS默认为FALSE。如果简单的提交:

SQL>EXECUTE dbms_support.start_trace;

SQL>ALTER SESSION SET EVENTS '10046 trace name context forever, level 1';

SQL>EXECUTE dbms_support.start_trace (BINDS=>true);

SQL>ALTER SESSION SET EVENTS '10046 trace name context forever, level 4';

SQL>EXECUTE dbms_support.start_trace (WAITS=>true);

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

SQL>EXECUTE dbms_support.stop_trace;

SQL>EXECUTE dbms_support.start_trace_in_session(25,4328,waits->true,binds=>true);

SQL>EXECUTE dbms_system.set_ev (25, 4328, 10046, 4, 8);

SQL>EXECUTE dbms_support.stop_trace_in_session (25, 4328);

其他问题

Level 0 = No statistics generated 
Level 1 = standard trace output including parsing, executes and fetches plus more. 
Level 2 = Same as level 1. 
Level 4 = Same as level 1 but includes bind information 
Level 8 = Same as level 1 but includes wait's information 
Level 12 = Same as level 1 but includes binds and waits 

参考信息

Metalink - http://metalink.oracle.com ( Note 62294.1 )

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