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目錄
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調優和系統效能監控
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
show parameter statistics_level;
建議還是改變Session就可以
alter session set statistics_level=ALL;
檢視引數CONTROL_MANAGEMENT_PACK_ACCESS
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$sql_monitor表裡
隨意找條sql,注意要加/*+ moniotr*/
select /*+ moniotr*/ a.user_code, a.full_name, a.user_pwd, c.unit_code, c.unit_name
from base_user a
left join (select ur.user_code, ur.unit_code
from t_user_role ur
where ur.user_role < 10) b
on a.user_code = b.user_code
left join t_unit_info c
on b.unit_code = c.unit_code
where c.unit_code in
(select uinfo.unit_code
from t_unit_info uinfo
start with uinfo.unit_code = '15803'
connect by prior uinfo.unit_code = uinfo.para_unit_code);
提供sql查詢,獲取sql_id
select sql_id,sql_text from v$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:
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
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
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:
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
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
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
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
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