1.1 开启session sql trace
alter session set tracefile_identifier='10046';
alter session set timed_statistics = true;      --默认是true
alter session set statistics_level=all;               --实例级别设置需要注意，会消耗大量的CPU
alter session set max_dump_file_size = unlimited;       --默认是unlimited
alter session set events '10046 trace name context forever,level 12'; --常用的级别是12

1.2 执行要trace的SQL
select * from scott.dept;
select empno from scott.emp where empno=7900;

1.3 关闭session sql trace
alter session set events '10046 trace name context off';
或者直接退出session
exit

1.4 查看session sql trace路径
select tracefile from v$process where addr=(select paddr from v$session where sid=(select distinct sid from v$mystat));
或者show parameter user_dump_dest ;

[root@vm01 trace]# cat ora11g_ora_2826_10046.trc
Trace file /u01/app/oracle/diag/rdbms/ora11g/ora11g/trace/ora11g_ora_2826_10046.trc
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /u01/app/oracle/product/11.2.4/db_1
System name:    Linux
Node name:    vm01
Release:    3.10.0-514.el7.x86_64
Version:    #1 SMP Tue Nov 22 16:42:41 UTC 2016
Machine:    x86_64
Instance name: ora11g
Redo thread mounted by this instance: 1
Oracle process number: 19
Unix process pid: 2826, image: oracle@vm01 (TNS V1-V3)

*** 2022-03-09 19:08:13.385
*** SESSION ID:(191.11) 2022-03-09 19:08:13.385
*** CLIENT ID:() 2022-03-09 19:08:13.385
*** SERVICE NAME:(SYS$USERS) 2022-03-09 19:08:13.385
*** MODULE NAME:(sqlplus@vm01 (TNS V1-V3)) 2022-03-09 19:08:13.385
*** ACTION NAME:() 2022-03-09 19:08:13.385
 
WAIT #140627976109008: nam='SQL*Net message to client' ela= 0 driver id=1650815232 #bytes=1 p3=0 obj#=-1 tim=1646870893385083

*** 2022-03-09 19:09:52.920
WAIT #140627976109008: nam='SQL*Net message from client' ela= 99534982 driver id=1650815232 #bytes=1 p3=0 obj#=-1 tim=1646870992920316
CLOSE #140627976109008:c=0,e=11,dep=0,type=1,tim=1646870992920377
=====================
PARSING IN CURSOR #140627976103496 len=44 dep=0 uid=0 oct=3 lid=0 tim=1646870992921728 hv=3324433311 ad='eade38c0' sqlid='9vzm5yg32dnwz'
select empno from scott.emp where empno=7900
END OF STMT
PARSE #140627976103496:c=1087,e=1329,p=0,cr=0,cu=0,mis=1,r=0,dep=0,og=1,plh=56244932,tim=1646870992921727
EXEC #140627976103496:c=32,e=31,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,plh=56244932,tim=1646870992921809
WAIT #140627976103496: nam='SQL*Net message to client' ela= 1 driver id=1650815232 #bytes=1 p3=0 obj#=-1 tim=1646870992921832
WAIT #140627976103496: nam='Disk file operations I/O' ela= 36 FileOperation=2 fileno=4 filetype=2 obj#=87109 tim=1646870992921928
WAIT #140627976103496: nam='db file sequential read' ela= 16 file#=4 block#=155 blocks=1 obj#=87109 tim=1646870992921955
FETCH #140627976103496:c=156,e=156,p=1,cr=1,cu=0,mis=0,r=1,dep=0,og=1,plh=56244932,tim=1646870992922002
STAT #140627976103496 id=1 cnt=1 pid=0 pos=1 obj=87109 op='INDEX UNIQUE SCAN PK_EMP (cr=1 pr=1 pw=0 time=163 us cost=0 size=4 card=1)'
WAIT #140627976103496: nam='SQL*Net message from client' ela= 101 driver id=1650815232 #bytes=1 p3=0 obj#=87109 tim=1646870992922157
FETCH #140627976103496:c=2,e=1,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=0,plh=56244932,tim=1646870992922173
WAIT #140627976103496: nam='SQL*Net message to client' ela= 0 driver id=1650815232 #bytes=1 p3=0 obj#=87109 tim=1646870992922183

*** 2022-03-09 19:12:41.496
WAIT #140627976103496: nam='SQL*Net message from client' ela= 168574494 driver id=1650815232 #bytes=1 p3=0 obj#=87109 tim=1646871161496696
CLOSE #140627976103496:c=4,e=4,dep=0,type=0,tim=1646871161496749
=====================
PARSING IN CURSOR #140627976103496 len=55 dep=0 uid=0 oct=42 lid=0 tim=1646871161496842 hv=2217940283 ad='0' sqlid='06nvwn223659v'
alter session set events '10046 trace name context off'
END OF STMT
PARSE #140627976103496:c=67,e=67,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=0,plh=0,tim=1646871161496841
EXEC #140627976103496:c=188,e=189,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=0,plh=0,tim=1646871161497054
[root@vm01 trace]#