Explain sql statement : EXPLAIN PLAN « SQL PLUS Session Environment « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
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Oracle PL/SQL Tutorial » SQL PLUS Session Environment » EXPLAIN PLAN 
29. 24. 2. Explain sql statement
SQL>
SQL> create table emp (
  2      EmpNo          NUMBER(10primary key,
  3      Name           VARCHAR2(40),
  4      DeptNo         NUMBER(2),
  5      Salary         NUMBER(7,2),
  6      Birth_Date     DATE,
  7      Soc_Sec_Num    VARCHAR2(9),
  8      State_Code     CHAR(2)
  9  );
SQL>
SQL> explain plan
  2  set Statement_Id = 'TEST'
  3  for
  4  select from emp;
SQL>
SQL> select LPAD(' ',2*Level)||Operation||' '||Options||' '||Object_Name Q_Plan
  2  from PLAN_TABLE
  3  where Statement_Id = 'TEST'
  4  connect by prior ID = Parent_ID and Statement_ID = 'TEST'
  5  start with ID=0;
                                                              

Q_PLAN
------------------------------------------------------------------------------------------------------------------------
  SELECT STATEMENT
    TABLE ACCESS FULL EMP
    TABLE ACCESS FULL EMP
  SELECT STATEMENT
    TABLE ACCESS FULL EMP
    TABLE ACCESS FULL EMP
                    
SQL>
SQL> set autotrace off  explain
SQL>
SQL>
SQL> drop table emp;
29. 24. EXPLAIN PLAN
29. 24. 1. SET AUTOTRACE TRACE EXP and EXPLAIN PLAN output
29. 24. 2. Explain sql statement
29. 24. 3. Execution plan for the specified statement_id
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