dbms_monitor开启/关闭会话跟踪

从10g开始，可以使用dbms_monitor开启/关闭会话跟踪。

sql> desc dbms_monitor
procedure client_id_stat_disable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 client_id                      varchar2                in
procedure client_id_stat_enable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 client_id                      varchar2                in
procedure client_id_trace_disable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 client_id                      varchar2                in
procedure client_id_trace_enable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 client_id                      varchar2                in
 waits                          boolean                 in     default
 binds                          boolean                 in     default
 plan_stat                      varchar2                in     default
procedure database_trace_disable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 instance_name                  varchar2                in     default
procedure database_trace_enable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 waits                          boolean                 in     default
 binds                          boolean                 in     default
 instance_name                  varchar2                in     default
 plan_stat                      varchar2                in     default
procedure serv_mod_act_stat_disable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 service_name                   varchar2                in
 module_name                    varchar2                in
 action_name                    varchar2                in     default
procedure serv_mod_act_stat_enable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 service_name                   varchar2                in
 module_name                    varchar2                in
 action_name                    varchar2                in     default
procedure serv_mod_act_trace_disable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 service_name                   varchar2                in
 module_name                    varchar2                in     default
 action_name                    varchar2                in     default
 instance_name                  varchar2                in     default
procedure serv_mod_act_trace_enable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 service_name                   varchar2                in
 module_name                    varchar2                in     default
 action_name                    varchar2                in     default
 waits                          boolean                 in     default
 binds                          boolean                 in     default
 instance_name                  varchar2                in     default
 plan_stat                      varchar2                in     default
procedure session_trace_disable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 session_id                     binary_integer          in     default
 serial_num                     binary_integer          in     default
procedure session_trace_enable
 argument name                  type                    in/out default?
 ------------------------------ ----------------------- ------ --------
 session_id                     binary_integer          in     default
 serial_num                     binary_integer          in     default
 waits                          boolean                 in     default
 binds                          boolean                 in     default
 plan_stat                      varchar2                in     default

sql>

1.会话级设置跟踪

#找到会话sid
select sid,serial#,username from v$session;

#开启跟踪（备注：四个参数都是可选参数，不带任何参数跟踪的是当前会话，跟踪结束后要关闭跟踪）
exec dbms_monitor.session_trace_enable(session_id=>190,serial_num=>8351,waits=>true,binds=>true);

#检查会话是否被跟踪
select sql_trace,sql_trace_waits,sql_trace_binds from v$session where sid=190;

#关闭跟踪
exec dbms_monitor.session_trace_disable(session_id=>190,serial_num=>8351);

　　

2.根据客户端标识设置会话跟踪

#设置客户端标识符
SQL> exec dbms_session.set_identifier('abce_id');

SQL> select sid,serial#,client_identifier from v$session where client_identifier is not null;

       SID    SERIAL# CLIENT_IDENTIFIER
---------- ---------- ----------------------------------------
       190       8355 abce_id

SQL>  

#客户端标识符设置跟踪
SQL> exec dbms_monitor.client_id_trace_enable(client_id=>'abce_id',waits=>true,binds=>false);
SQL> select primary_id as client_id,waits,binds from dba_enabled_traces where trace_type='CLIENT_ID';

CLIENT_ID                                                        WAITS BINDS
---------------------------------------------------------------- ----- -----
abce_id                                                          TRUE  FALSE

SQL>
#关闭跟踪
SQL> exec dbms_monitor.client_id_trace_disable(client_id=>'abce_id');

3.模块级、数据库级监控(略，具体查看上面的定义)

4.跟踪视图
查看dba_enabled_traces和dba_enabled_aggregations视图，可以看到启用的跟踪和收集的统计信息。可以使用这些视图确保已经禁用的所有跟踪选项。