Oracle SQL Performance Analyzer的使用

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发布时间：2016-06-07 16:49:30

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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 mdash; 这是一项极

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。新版本中，我们不需要再那样做了，我改用非常简单而有效的 SQL Performance Analyzer。

在CentOS 6.4下安装Oracle 11gR2(x64)

Oracle 11gR2 在VMWare虚拟机中安装步骤

Debian 下安装 Oracle 11g XE R2

---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

select count(*) from t1 where sid

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;
/

/*********有两个参数值得特别说明：

1）SELECT_CURSOR_CACHE的第一个参数是basic_filter ，它可以取的值有：

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的最后一个参数是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

*********/