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_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;

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

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';

删除即可：

execute dbms_sqltune.drop_tuning_task('compare_1');

begin

dbms_sqltune.drop_sqlset('sql_1');

end;