Oracle SQL調優系列之SQL Monitor Report
阿新 • • 發佈：2020-06-19
@[TOC](Oracle SQL調優系列之SQL Monitor Report)
### 1、SQL Monitor簡介
sql monitor是oracle官方提供的自動監控符合特定條件的SQL，用於收集執行時的細節資訊的監控工具，常用於sql調優和系統性能監控
### 2、捕捉sql的前提
sql monitor 捕捉sql的前提：
* 並行執行的sql語句
* 單次執行消耗的CPU或IO超過5秒
* statistics_level級別必須是TYPICAL 或者ALL
* 使用/* +MONITOR*/ HINT的SQL語句
### 3、SQL Monitor 引數設定
* STATISTICS_LEVEL必須設定為：'TYPICAL'（預設）或者 'ALL'
* CONTROL_MANAGEMENT_PACK_ACCESS設定為：'DIAGNOSTIC+TUNING'
檢視statistics_level引數
```sql
show parameter statistics_level;
```
建議還是改變Session就可以
```sql
alter session set statistics_level=ALL;
```
檢視引數CONTROL_MANAGEMENT_PACK_ACCESS
```sql
show parameter CONTROL_MANAGEMENT_PACK_ACCESS;
```
### 4、SQL Monitor Report
本部落格採用DBMS_SQLTUNE包DBMS_SQLTUNE.report_sql_monitor的方式獲取，報告格式有：'TEXT'，'HTML'，'XML' ，'ACTIVE'，其中'ACTIVE'只在11g R2以後才支援
#### 4.1、SQL_ID獲取
sql monitor使用，必須在sql中使用`/* +MONITOR*/ ` Hint，然後資料會存在v$sql_monitor表裡
隨意找條sql，注意要加`/*+ moniotr*/`
```sql
select /*+ moniotr*/ a.user_code, a.full_name, a.user_pwd, c.unit_code, c.unit_name
from base_user a
left join (select ur.user_code, ur.unit_code
from t_user_role ur
where ur.user_role < 10) b
on a.user_code = b.user_code
left join t_unit_info c
on b.unit_code = c.unit_code
where c.unit_code in
(select uinfo.unit_code
from t_unit_info uinfo
start with uinfo.unit_code = '15803'
connect by prior uinfo.unit_code = uinfo.para_unit_code);
```
提供sql查詢，獲取sql_id
```sql
select sql_id,sql_text from v$sql_monitor where sql_text like '%t_unit_info%
```
#### 4.2、Text文字格式
將上面查詢到的sql_id改下，然後執行如下SQL：
```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
```
獲取到text格式的sql monitor
#### 4.3、Html格式
```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_html.html
SELECT DBMS_SQLTUNE.REPORT_SQL_MONITOR(
SQL_ID => 'g9rtj389t0g66',
TYPE => 'HTML',
REPORT_LEVEL => 'ALL') AS REPORT
FROM dual;
spool off
```
獲取到對應報告，可以看到執行計劃、Buffer Gets 等等資訊
#### 4.4、ACTIVE格式
ACTIVE格式需要下載相應的flash元件、指令碼，詳細見[SQL Monitor Report 使用詳解](http://blog.itpub.net/27067062/viewspace-2129635/#_SQL_Monitor_report獲取方法)
```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_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
如果要獲取所有sql monitor，就可以使用如下SQL：
```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查詢
提供sql monitor常用的查詢指令碼
#### 5.1、檢視所有的sql monitor report
* 檢視所有的sql monitor report
```sql
select dbms_sqltune.report_sql_monitor from dual;
```
#### 5.2、檢視某個sql的sql monitor report
* 檢視某個sql的sql monitor report
```sql
SELECT DBMS_SQLTUNE.report_sql_monitor(sql_id => '2rjh5d5k2yujz', type => 'TEXT') from dual;
```
#### 5.3、檢視某個sql的整體效能
* 檢視某個sql的整體效能
```sql
SELECT DBMS_SQLTUNE.report_sql_monitor_list(sql_id=>'2rjh5d5k2yujz',type =>'TEXT',report_level => 'ALL') AS report FROM dual;
```
#### 5.4、檢視整個系統的效能
* 檢視整個系統的效能
```sql
SELECT DBMS_SQLTUNE.report_sql_monitor_list(type =>'TEXT',report_level => 'ALL') AS report FROM dual;
```
相關SQL指令碼下載：[sql download](https://github.com/u014427391/oracle_optimize_sql/tree/master/sql%20