Oracle存储过程本地编译方式

     通常将Oracle存储过程编译为本地编译方式的测试记录.

  测试用表:   

SQL> create table t1(rid number);
 
Table created
 
SQL> create table t_n(rid number);
 
Table created

测试用的存储过程:

create or replace procedure pro_xcl(p1 varchar2)
is
begin
    dbms_output.put_line(p1);
  
    insert into t1 select rownum as rr 
    from dual connect by rownum < 1000000;
    commit;
   
exception
  when others then
     dbms_output.put_line(sqlcode||' : '||substr(sqlerrm,200));  
end;

测试: 

SQL> set serveroutput on
SQL> set timing on
--查看存储过程当前编译方式
SQL>  select plsql_code_type from all_plsql_object_settings where name='PRO_XCL';
 
PLSQL_CODE_TYPE
--------------------------------------------------------------------------------
INTERPRETED
 
Executed in 0.14 seconds

SQL> exec pro_xcl('11g INTERPRETED');
 
11g INTERPRETED
 
PL/SQL procedure successfully completed
 
Executed in 4.68 seconds

  更改下，pro_xcl，将t1换成t_n表。

  测试本地编译方式出来的存储过程运行速度.

-- 用本地编译方式编译存储过程pro_xcl
SQL> alter procedure pro_xcl compile plsql_code_type=native;
 
Procedure altered
 
Executed in 0.062 seconds
 --查看存储过程当前编译方式,可看到，已变成本地编译方式了
SQL>  select plsql_code_type from all_plsql_object_settings where name='PRO_XCL';
 
PLSQL_CODE_TYPE
--------------------------------------------------------------------------------
NATIVE
 
Executed in 0.063 seconds


SQL> exec pro_xcl('11g NATIVE');
 
11g NATIVE
 
PL/SQL procedure successfully completed
 
Executed in 4.087 seconds

 本地编译方式要快0.6秒，没有快到想象的夸张的地步。

设置当前session程序编译方式默认为本地编译:

     alter session set plsql_code_type=native;

设置数据库默认程序为本地编译方式:

   alter system set plsql_code_type=native;

与PLSQL编译相关一些参数：　　

SQL> show parameter plsql
 
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
plsql_ccflags                        string      
plsql_code_type                      string      INTERPRETED
plsql_debug                          boolean     FALSE
plsql_optimize_level                 integer     2
plsql_v2_compatibility               boolean     FALSE
plsql_warnings                       string      DISABLE:ALL