使用dbms_system追踪其它session

dbms_system是内部包，建议在官方指导下使用该包。

SQL> desc dbms_system
PROCEDURE ADD_PARAMETER_VALUE
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 PARNAME                        VARCHAR2                IN
 VALUE                          VARCHAR2                IN
 SCOPE                          VARCHAR2                IN     DEFAULT
 SID                            VARCHAR2                IN     DEFAULT
 POSITION                       BINARY_INTEGER          IN     DEFAULT
PROCEDURE DIST_TXN_SYNC
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 INST_NUM                       NUMBER                  IN
PROCEDURE GET_ENV
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 VAR                            VARCHAR2                IN
 VAL                            VARCHAR2                OUT
PROCEDURE KCFRMS
PROCEDURE KSDDDT
PROCEDURE KSDFLS
PROCEDURE KSDIND
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 LVL                            BINARY_INTEGER          IN
PROCEDURE KSDWRT
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 DEST                           BINARY_INTEGER          IN
 TST                            VARCHAR2                IN
PROCEDURE READ_EV
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 IEV                            BINARY_INTEGER          IN
 OEV                            BINARY_INTEGER          OUT
PROCEDURE REMOVE_PARAMETER_VALUE
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 PARNAME                        VARCHAR2                IN
 VALUE                          VARCHAR2                IN
 SCOPE                          VARCHAR2                IN     DEFAULT
 SID                            VARCHAR2                IN     DEFAULT
PROCEDURE REMOVE_PARAMETER_VALUE
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 PARNAME                        VARCHAR2                IN
 POSITION                       BINARY_INTEGER          IN
 SCOPE                          VARCHAR2                IN     DEFAULT
 SID                            VARCHAR2                IN     DEFAULT
PROCEDURE SET_BOOL_PARAM_IN_SESSION
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 SID                            NUMBER                  IN
 SERIAL#                        NUMBER                  IN
 PARNAM                         VARCHAR2                IN
 BVAL                           BOOLEAN                 IN
PROCEDURE SET_EV
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 SI                             BINARY_INTEGER          IN
 SE                             BINARY_INTEGER          IN
 EV                             BINARY_INTEGER          IN
 LE                             BINARY_INTEGER          IN
 NM                             VARCHAR2                IN
PROCEDURE SET_INT_PARAM_IN_SESSION
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 SID                            NUMBER                  IN
 SERIAL#                        NUMBER                  IN
 PARNAM                         VARCHAR2                IN
 INTVAL                         BINARY_INTEGER          IN
PROCEDURE SET_SQL_TRACE_IN_SESSION
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 SID                            NUMBER                  IN
 SERIAL#                        NUMBER                  IN
 SQL_TRACE                      BOOLEAN                 IN
PROCEDURE WAIT_FOR_EVENT
 Argument Name                  Type                    In/Out Default?
 ------------------------------ ----------------------- ------ --------
 EVENT                          VARCHAR2                IN
 EXTENDED_ID                    BINARY_INTEGER          IN
 TIMEOUT                        BINARY_INTEGER          IN

SQL>

#查看10046事件的追踪级别

SQL> declare lev integer;
  2  begin
  3     dbms_system.read_ev('10046',lev);
  4     dbms_output.put_line(lev);
  5  end;
  6  /

PL/SQL procedure successfully completed.

SQL>

#对指定session开启sql_trace追踪

exec dbms_system.set_sql_trace_in_session(<sid>,<serial#>,true);---开启SQL_TRACE跟踪
exec dbms_system.set_sql_trace_in_session(<sid>,<serial#>,false);---关闭SQL_TRACE跟踪

#对指定session开启10046追踪

dbms_system.set_ev(
si IN BINARY_INTEGER,  -- session id
se IN BINARY_INTEGER,  -- session serial number
ev IN BINARY_INTEGER,  -- event number between 10000 and 10999
le IN BINARY_INTEGER,  -- event level
nm IN VARCHAR2);

exec dbms_system.set_ev(<sid>,<serial#>,12,'ybb');    ----开启级别为12的跟踪
exec dbms_system.set_ev(<sid>,<serial#>,0,'ybb');    -----关闭跟踪