Oracle SQL调优系列之SQL Monitor Report

、SQL Monitor简介

sql monitor是oracle官方提供的自动监控符合特定条件的SQL，用于收集执行时的细节信息的监控工具，常用于sql调优和系统性能监控

2、捕捉sql的前提

sql monitor 捕捉sql的前提：

• 并行执行的sql语句

• 单次执行消耗的CPU或IO超过5秒

• statistics_level级别必须是TYPICAL 或者ALL

• 使用/* +MONITOR*/ HINT的SQL语句

3、SQL Monitor 参数设置

• STATISTICS_LEVEL必须设置为：'TYPICAL'（缺省）或者 'ALL'

• CONTROL_MANAGEMENT_PACK_ACCESS设置为：'DIAGNOSTIC+TUNING'

查看statistics_level参数

show parameter statistics_level;

建议还是改变Session就可以

alter session set statistics_level=ALL;

查看参数CONTROL_MANAGEMENT_PACK_ACCESS

show parameter CONTROL_MANAGEMENT_PACK_ACCESS;

4、SQL Monitor Report

本博客采用DBMS_SQLTUNE包DBMS_SQLTUNE.report_sql_monitor的方式获取，报告格式有：'TEXT'，'HTML'，'XML' ，'ACTIVE'，其中'ACTIVE'只在11g R2以后才支持

4.1、SQL_ID获取

sql monitor使用，必须在sql中使用/* +MONITOR*/ Hint，然后数据会存在v$sql_monitor表里

随意找条sql，注意要加/*+ moniotr*/

select /*+ moniotr*/ a.user_code, a.full_name, a.user_pwd, c.unit_code, c.unit_name
  from base_user a
  left join (select ur.user_code, ur.unit_code
               from t_user_role ur
              where ur.user_role < 10) b
    on a.user_code = b.user_code
  left join t_unit_info c
    on b.unit_code = c.unit_code
where c.unit_code in
       (select uinfo.unit_code
          from t_unit_info uinfo
         start with uinfo.unit_code = '15803'
        connect by prior uinfo.unit_code = uinfo.para_unit_code);
     

提供sql查询，获取sql_id

select sql_id,sql_text from v$sql_monitor where sql_text like '%t_unit_info%

4.2、Text文本格式

将上面查询到的sql_id改下，然后执行如下SQL：

SET LONG 1000000
SET LONGCHUNKSIZE 1000000
SET LINESIZE 1000
SET PAGESIZE 0
SET TRIM ON
SET TRIMSPOOL ON
SET ECHO OFF
SET FEEDBACK OFF
spool report_sql_monitor_text.txt
SELECT DBMS_SQLTUNE.REPORT_SQL_MONITOR(
  SQL_ID => 'g9rtj389t0g66',
  TYPE => 'TEXT',
  REPORT_LEVEL => 'ALL') AS REPORT
FROM dual;
spool off

获取到text格式的sql monitor

4.3、Html格式

SET LONG 1000000
SET LONGCHUNKSIZE 1000000
SET LINESIZE 1000
SET PAGESIZE 0
SET TRIM ON
SET TRIMSPOOL ON
SET ECHO OFF
SET FEEDBACK OFF
spool report_sql_monitor_html.html
SELECT DBMS_SQLTUNE.REPORT_SQL_MONITOR(
  SQL_ID => 'g9rtj389t0g66',
  TYPE => 'HTML',
  REPORT_LEVEL => 'ALL') AS REPORT
FROM dual;
spool off

获取到对应报告，可以看到执行计划、Buffer Gets 等等信息

4.4、ACTIVE格式

ACTIVE格式需要下载相应的flash组件、脚本，详细见SQL Monitor Report 使用详解

SET LONG 1000000
SET LONGCHUNKSIZE 1000000
SET LINESIZE 1000
SET PAGESIZE 0
SET TRIM ON
SET TRIMSPOOL ON
SET ECHO OFF
SET FEEDBACK OFF
spool report_sql_monitor_active.html
SELECT DBMS_SQLTUNE.REPORT_SQL_MONITOR(
  SQL_ID => '2rjh5d5k2yujz',
  TYPE => 'ACTIVE',
  REPORT_LEVEL => 'ALL',
  BASE_PATH => 'http://ip/script') AS REPORT
FROM dual;
spool off

4.5 SQL Monitoring list

如果要获取所有sql monitor，就可以使用如下SQL：

SET LONG 1000000
SET LONGCHUNKSIZE 1000000
SET LINESIZE 1000
SET PAGESIZE 0
SET TRIM ON
SET TRIMSPOOL ON
SET ECHO OFF
SET FEEDBACK OFF
SPOOL report_sql_monitor_list.html
SELECT dbms_sqltune.report_sql_monitor_list(
  type         => 'HTML',
  report_level => 'ALL') AS report
FROM dual;
SPOOL OFF

5、SQL Monitor Report查询

提供sql monitor常用的查询脚本

5.1、查看所有的sql monitor report

• 查看所有的sql monitor report

   select dbms_sqltune.report_sql_monitor from dual;

5.2、查看某个sql的sql monitor report

• 查看某个sql的sql monitor report

  SELECT DBMS_SQLTUNE.report_sql_monitor(sql_id => '2rjh5d5k2yujz', type => 'TEXT') from dual;

5.3、查看某个sql的整体性能

• 查看某个sql的整体性能

   SELECT DBMS_SQLTUNE.report_sql_monitor_list(sql_id=>'2rjh5d5k2yujz',type =>'TEXT',report_level => 'ALL') AS report FROM dual;

5.4、查看整个系统的性能

• 查看整个系统的性能

   SELECT DBMS_SQLTUNE.report_sql_monitor_list(type =>'TEXT',report_level => 'ALL') AS report FROM dual;