实战:ORACLE SQL Performance Analyzer

通过 SPA，您能够依据各种更改类型（如初始化參数更改、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，然后生成比較报告，帮助您评估它们的影响.

在 Oracle Database 11g 之前的版本号中，我必须捕获全部 SQL 语句，通过跟踪执行这些语句，
然后得到运行计划 —
这是一项极其耗时又极易出错的任务。新版本号中，我们不须要再那样做了，
我改用很easy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.更改数据库參数
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.运行查询

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.载入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;
/

/*********有两个參数值得特别说明：

1）SELECT_CURSOR_CACHE的第一个參数是basic_filter ，它能够取的值有：

sql_id                  
VARCHAR(13),
  force_matching_signature NUMBER,
 
sql_text                
CLOB,
 
object_list             
sql_objects,
 
bind_data               
RAW(2000),
  parsing_schema_name     
VARCHAR2(30),
 
module                  
VARCHAR2(48),
 
action                  
VARCHAR2(32),
 
elapsed_time            
NUMBER,
 
cpu_time                
NUMBER,
 
buffer_gets             
NUMBER,
 
disk_reads              
NUMBER,
 
direct_writes           
NUMBER,
 
rows_processed          
NUMBER,
 
fetches                 
NUMBER,
 
executions              
NUMBER,
  end_of_fetch_count      
NUMBER,
 
optimizer_cost          
NUMBER,
 
optimizer_env           
RAW(1000),
 
priority                
NUMBER,
 
command_type            
NUMBER,
 
first_load_time         
VARCHAR2(19),
 
stat_period             
NUMBER,
  active_stat_period      
NUMBER,
 
other                   
CLOB,
 
plan_hash_value         
NUMBER,
 
sql_plan                
sql_plan_table_type,
 
bind_list               
sql_binds

2）SELECT_CURSOR_CACHE的最后一个參数是attribute_list

BASIC (default) -all attributes (such as execution statistics and binds) are
returned except the plans The execution context is always part of the
result.

TYPICAL - BASIC + SQL plan (without row source statistics) and without object
reference list

ALL - return all attributes

Comma separated list of attribute names this allows to return only a subset
of SQL attributes: EXECUTION_STATISTICS, BIND_LIST, OBJECT_LIST,
SQL_PLAN,SQL_PLAN_STATISTICS: similar to SQL_PLAN + row source statistics

*********/

---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;
/

/**********语法

Syntax

SQL text format. This form of the function is called to prepare the analysis
of a single statement given its text.

DBMS_SQLPA.CREATE_ANALYSIS_TASK(
 
sql_text         IN CLOB,
 
bind_list        IN sql_binds := NULL,

  parsing_schema   IN VARCHAR2  := NULL,
 
task_name        IN VARCHAR2  :=
NULL,
  description      IN VARCHAR2  :=
NULL)
RETURN VARCHAR2;
SQL ID format. This form of the function is called
to prepare the analysis of a single statement from the cursor cache given its
identifier.

DBMS_SQLPA.CREATE_ANALYSIS_TASK(
 
sql_id           IN
VARCHAR2,
  plan_hash_value  IN NUMBER    :=
NULL,
  task_name        IN
VARCHAR2  := NULL,
  description      IN
VARCHAR2  := NULL)
RETURN VARCHAR2;
Workload Repository format. This
form of the function is called to prepare the analysis of a single statement
from the workload repository given a range of snapshot identifiers.

DBMS_SQLPA.CREATE_ANALYSIS_TASK(
 
begin_snap       IN NUMBER,
 
end_snap         IN NUMBER,
 
sql_id           IN
VARCHAR2,
  plan_hash_value  IN NUMBER    :=
NULL,
  task_name        IN
VARCHAR2  := NULL,
  description      IN
VARCHAR2  := NULL)
RETURN VARCHAR2;

SQLSET format. This form of the function is called to prepare the
analysis of a SQL tuning set.

DBMS_SQLPA.CREATE_ANALYSIS_TASK(
 
sqlset_name       IN VARCHAR2,
 
basic_filter      IN VARCHAR2 :=  NULL,
 
order_by          IN VARCHAR2
:=  NULL,
 
top_sql           IN VARCHAR2
:=  NULL,
 
task_name         IN VARCHAR2 := 
NULL,
  description       IN VARCHAR2
:=  NULL
  sqlset_owner      IN VARCHAR2
:=  NULL)
RETURN VARCHAR2;

**********/

---9.运行SPA

begin
dbms_sqlpa.execute_analysis_task
(
task_name =>
‘SPA01‘,
execution_type => ‘test execute‘,
execution_name =>
‘before_change‘
);
end;
/

/*********语法

DBMS_SQLPA.EXECUTE_ANALYSIS_TASK(
  
task_name         IN VARCHAR2,

   execution_type    IN
VARCHAR2              
:= ‘test execute‘,
   execution_name    IN
VARCHAR2              
:= NULL,
   execution_params  IN
dbms_advisor.argList   := NULL,
  
execution_desc    IN
VARCHAR2              
:= NULL)
  RETURN VARCHAR2;

DBMS_SQLPA.EXECUTE_ANALYSIS_TASK(
  
task_name         IN VARCHAR2,

   execution_type    IN
VARCHAR2              
:= ‘test execute‘,
   execution_name    IN
VARCHAR2              
:= NULL,
   execution_params  IN
dbms_advisor.argList   := NULL,
  
execution_desc    IN
VARCHAR2              
:= NULL);

*********/

---10.改变

create index index_01 on t1(sid,sname)
tablespace test;

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

---11.改变后运行

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.运行任务比較

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;

实战:ORACLE SQL Performance Analyzer,布布扣,bubuko.com

时间： 2024-10-07 22:37:44

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