執行計劃查看

查看執行計劃的方法：

1：set autotrace on

若是出現錯誤：須要重建plustrce角色；

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> @?/sqlplus/admin/plustrce.sql
SQL>
SQL> drop role plustrace;
drop role plustrace
*
ERROR at line 1:
ORA-01919: role 'PLUSTRACE' does not exist

SQL> create role plustrace;

Role created.

SQL>
SQL> grant select on v_$sesstat to plustrace;

Grant succeeded.

SQL> grant select on v_$statname to plustrace;

Grant succeeded.

SQL> grant select on v_$mystat to plustrace;

Grant succeeded.

SQL> grant plustrace to dba with admin option;

Grant succeeded.

SQL>
SQL> set echo off
SQL>

SQL> drop role plustrce;
drop role plustrce
*
ERROR at line 1:
ORA-01919: role 'PLUSTRCE' does not exist

SQL> create role plustrce;

Role created.

 

SQL> grant select on v_$sesstat to plustrce;

Grant succeeded.

SQL> grant select on v_$statname to plustrce;

Grant succeeded.

SQL> grant select on v_$mystat to plustrce;

Grant succeeded.

SQL> grant plustrce to dba with admin option;

Grant succeeded. 

SQL> set echo off
SQL> grant plustrce to scott;

Grant succeeded.

 

set autotrace on/off　　【開啓關閉】

set autotrace explain/statistics　　【只顯示執行計劃/只顯示統計信息】

set autotrace traceonly　　【顯示統計信息和執行計劃，可是不顯示執行結果】

 

2:explain plan for SQL；

select * from table(dbms_xplan.diaplay);

select plan_table_output from table(dbms_xplan.display('plan_table'));

 

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