实战:ORACLE SQL Performance Analyzer的使用

通过 SPA，您可以根据各种更改类型（如初始化参数更改、优化器统计刷新和数据库升级）播放特定的

sql 或整个 SQL 负载，然后生成比较报告，帮助您评估它们的影响.

在 oracle Database 11g 之前的版本中，我必须捕获所有 SQL 语句，通过跟踪运行这些语句，

然后得到执行计划 — 这是一项极其耗时又极易出错的任务。有了新版本之后，我不需要再那样做了，

我改用非常简单而有效的 SQL PerfORMance Analyzer。

---使用场景

1.数据库升级

2.实施优化建议

3.更改方案

4.收集统计信息

5.更改数据库参数

6.更改操作系统和硬件

create tablespace test

datafile 'E:\APP\ADMINISTRATOR\ORADATA\ORCL\test01.DBF'

size 5000m

autoextend on

next 100m maxsize unlimited

extent management local autoallocate

segment   space management auto;

create table t1

(

sid int not null ,

sname varchar2(10)

)

tablespace test;

-2.-循环导入数据

declare

        maxrecords constant int:=1000000;

        i int :=1;

    begin

        for i in 1..maxrecords loop

          insert into t1 values(i,'ocpyang');

        end loop;

    dbms_output.put_line(' 成功录入数据！ ');

    commit;

    end; 

/

update t1 set sname='苏州' where sid=500001;

update t1 set sname='南京' where sid=600001;

---3.收集统计信息

exec dbms_stats.gather_table_stats(USER,'T1',CASCADE=>TRUE)

alter system flush shared_pool;

---4.执行查询

select count(*) from t1 where sid<=100;

select count(*) from t1 where sid<=500;

select count(*) from t1 where sid>50000;

---5.新建STS

BEGIN

  DBMS_SQLTUNE.DROP_SQLSET(

    sqlset_name => 'OCPYANG_STS'

    );

END;

/

BEGIN

  DBMS_SQLTUNE.CREATE_SQLSET(

    sqlset_name => 'OCPYANG_STS', 

    sqlset_owner => 'SYS',

    description  => 'ocpyangtest');

END;

/

---6.加载sql优化集

set serveroutput on

DECLARE 

cur01 dbms_sqltune.sqlset_cursor;

BEGIN 

open cur01 for select value(a) from table(dbms_sqltune.select_cursor_cache

(

basic_filter => 'sql_text like ''%t1%'' and parsing_schema_name =''SYS''',

attribute_list => 'ALL'

)

) a; 

dbms_sqltune.load_sqlset(

sqlset_name => 'OCPYANG_STS',

populate_cursor => cur01);

close cur01;

END; 

/

---7.查询sql优化集

select sql_id,sql_text from dba_sqlset_statements

where sqlset_name='OCPYANG_STS' and sql_text like '% from t1%';

---8.新建SPA

var v_task varchar2(64);

begin

:v_task:=dbms_sqlpa.create_analysis_task(

sqlset_name => 'OCPYANG_STS', 

task_name => 'SPA01'

);

end;

/

---9.执行SPA

begin

dbms_sqlpa.execute_analysis_task

(

task_name => 'SPA01',

execution_type => 'test execute',

execution_name => 'before_change'

);

end;

/

---10.改变

create index index_01 on t1(sid,sname)

tablespace test;

exec dbms_stats.gather_table_stats(USER,'T1',CASCADE=>TRUE)

---11.改变后执行

begin

dbms_sqlpa.execute_analysis_task

(

task_name => 'SPA01',

execution_type => 'test execute',

execution_name => 'after_change'

);

end;

/

col TASK_NAME format a30

col EXECUTION_NAME for a30

select execution_name,

status,

execution_end

from DBA_ADVISOR_EXECUTIONS

where task_name='SPA01'

order by execution_end

/

EXECUTION_NAME                 STATUS      EXECUTION_END

------------------------------ ----------- -------------------

before_change                  COMPLETED   2014-05-28 15:43:58

after_change                   COMPLETED   2014-05-28 15:44:58

---12.执行任务比较

begin 

dbms_sqlpa.EXECUTE_ANALYSIS_TASK(

task_name        => 'SPA01', 

execution_type   => 'compare performance', 

execution_params => dbms_advisor.arglist(

'execution_name1', 

'before_change', 

'execution_name2', 

'after_change'));

end;

/

---13.生产报告

set serveroutput on size 999999

set long 100000000

set pagesize 0

set linesize 200

set lonGChunksize 200

set trimspool on

spool e:\report.txt

select DBMS_SQLPA.REPORT_ANALYSIS_TASK('SPA01') from dual;

spool off;