oracle spa

oracle spa属于real application test的内容，用来对比sql前后性能变化，比如我要比较一条sql前后的的性能变化：
--单条sql流程

alter session set optimizer_features_enable='10.2.0.4';
variable g_task varchar2(100);
exec :g_task:= dbms_sqlpa.create_analysis_task(task_name=>'TASK2',sql_text=>'select count(*) from employees where employee_id>10') 
exec  dbms_sqlpa.execute_analysis_task(task_name=>:g_task,execution_type=>'test execute',execution_name=>'before_change');
alter table employees drop primary key drop index;
alter session set optimizer_features_enable='11.2.0.4';
--EXEC DBMS_sqlPA.SET_ANALYSIS_TASK_ParaMETER( :g_task,'comparison_metric','buffer_gets');
exec  dbms_sqlpa.execute_analysis_task(task_name=>:g_task,execution_name=>'after change'); 
exec  dbms_sqlpa.execute_analysis_task(task_name=>:g_task,execution_type=>'compare performance',execution_name=>'compar'); 
spool d:\spa_report_elapsed_time.html
SELECT dbms_sqlpa.report_analysis_task(:g_task,'HTML','ALL','ALL') FROM dual;
spool off;
exec  DBMS_sqlPA.DROP_ANALYSIS_TASK('TASK2');
begin
DBMS_sqlPA.DROP_ANALYSIS_TASK('TASK2');
end;

当然一条SQ闹这么大动静是不值得的，用dba_hist视图就可以对比出来了，不用这么烦神；一个schema下的所有sql这个就比较劳神了，用spa可以很好的解决这个问题,流程如下：
**1.在生产上捕获工作负载

2.将sql工作负载传输到一个测试系统

3.构建“更改前”性能数据

4.进行sql重放，生成性能数据

5.对比，生成报告

具体实施步骤：
源端：oracle 10.2.0.1　,hr用户，权限：grant advisor,administer sql tuning set to hr;
１　找到awr对应的snapshot;

begin 
  dbms_workload_repository.create_snapshot(); 
end;
select * from dba_hist_snapshot where begin_interval_time>sysdate-1/24

2 建立sqlset ，采集sql 性能数据
--创建sqlset

begin
    dbms_sqltune.create_sqlset('sql_1') ;
    end;

declare cur sys_refcursor;
            begin
            open cur for
            SELECT VALUE(P) FROM
            TABLE(DBMS_sqlTUNE.select_workload_repository(49,50,q'[ parsing_schema_name in ('HR') ]')) p;
            dbms_sqltune.load_sqlset(sqlset_name => 'sql_1',populate_cursor => cur);
            close cur;
            end;
            /

--查看sqlset集

select * from table(dbms_sqltune.select_sqlset('sql_1')) where buffer_gets>0;
--创建sqlset表

begin
   dbms_sqltune.create_stgtab_sqlset(table_name => 'SPA_2',schema_name => 'HR');
   end;

--执行pack，将数据打包到表

begin
    DBMS_sqlTUNE.pack_stgtab_sqlset(sqlset_name => 'upg_sql',sqlSET_OWNER=>'HR',staging_table_name => 'SPA_2',staging_schema_owner => 'HR');
end;

--删除 sqlset

exec  dbms_sqltune.drop_sqlset('sql_1') ;

select  sql_id,sql_text,buffer_gets from spa_2;

expdp hr/hr directory=exp dumpfile=spa.dmp logfile=spa.log tables=SPA_2

传输到11g的服务器，目标端：oracle 11.2.0.4
impdp之后解压：

begin
 DBMS_sqlTUNE.UNPACK_STGTAB_sqlSET(sqlset_name         => 'sql_1',sqlset_owner        => 'HR',replace             => TRUE,staging_table_name  => 'SPA_2');
   end;

建立分析任务

VAR aname varchar2(30);
EXEC :aname := DBMS_sqlPA.CREATE_ANALYSIS_TASK(task_name => 'compares',sqlset_name =>'sql_1');

--执行源端10g分析
begin
  DBMS_sqlPA.EXECUTE_ANALYSIS_TASK(task_name => 'compares',execution_type => 'convert sqlset',execution_name => 'first trial');
          end;
--执行目标端11分析         
begin

  DBMS_sqlPA.EXECUTE_ANALYSIS_TASK(task_name => 'compares',execution_type => 'test execute',execution_name => 'second trial'
          );

end;

--生成比较任务     
begin
  DBMS_sqlPA.EXECUTE_ANALYSIS_TASK(task_name => 'compares',execution_type => 'compare',execution_name => 'compare_1'
          );   
 end;
 --生成报告  
 spool reports.html
 SELECT DBMS_sqlPA.REPORT_ANALYSIS_TASK('compares','html','TYPICAL','ALL') from dual;

删除任务

begin
  DBMS_sqlPA.DROP_ANALYSIS_TASK('compares');
  end;

相关包说明参考：Oracle® Database PL/sql Packages and Types Reference 11g Release 2 (11.2)--》dbms_spa/dbms_sqltune

oracle spa

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