oracle spa

oracle spa属于real application test的内容，用来对比sql先后性能变化，好比我要比较一条sql先后的的性能变化：
--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_type=>'test execute',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;

固然一条SQ闹这么大动静是不值得的，用dba_hist视图就能够对比出来了，不用这么烦神；一个schema下的全部sql这个就比较劳神了，用spa能够很好的解决这个问题,流程以下：
**1.在生产上捕获工做负载

2.将SQL工做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 创建sqlset ，采集sql性能数据
--建立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;
--建立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以后解压：

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

创建分析任务

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
1 相关错误

ERROR at line 1:
ORA-13757: "SQL Tuning Set" "sql_1" owned by user "HR" is active.
说明sql_1正在被使用，找到被引用的分析任务

select description, created, owner
from DBA_SQLSET_REFERENCES
where sqlset_name ='sql_1';
DESCRIPTION                                 CREATED   OWNER
--------------------------------------------------------------------------------------------- --------- ------------------------------
created by: SQL Performance Analyzer - task: compare_1                20-JUL-18 HR

select owner,description, created,last_modified
 from DBA_ADVISOR_TASKS
 where task_name = 'compare_1';

删除便可：

execute dbms_sqltune.drop_tuning_task('compare_1');
begin
 dbms_sqltune.drop_sqlset('sql_1');
end;