oracle spa-snowhill
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')
execdbms_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');
execdbms_sqlpa.execute_analysis_task(task_name=>:g_task,execution_type=>'test execute',execution_name=>'after change');
execdbms_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;
execDBMS_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
execdbms_sqltune.drop_sqlset('sql_1') ;
selectsql_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> 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;
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