SQL Access Advisor in Oracle Database 10g
The SQL Access Advisor makes suggestions about indexes and materialized views which might improve system performance. This article describes how to use the SQL Access Advisor in Oracle 10g.
Related articles.
Enterprise Manager
The SQL Access Advisor is accessible from Enterprise Manager. Specific reports can be produced by clicking on the "Advisor Central" link, then the "SQL Access Advisor" link. The resulting page allows you to create a workload and a SQL Access Advisor task. Once the task has completed you can view information about the findings and recommendations.
DBMS_ADVISOR
The DBMS_ADVISOR
package can be used to create and execute any advisor tasks, including SQL Access Advisor tasks. The following example shows how it is used to create, execute and display a typical SQL Access Advisor script for the current workload.
DECLARE
l_taskname VARCHAR2(30) := 'test_sql_access_task';
l_task_desc VARCHAR2(128) := 'Test SQL Access Task';
l_wkld_name VARCHAR2(30) := 'test_work_load';
l_saved_rows NUMBER := 0;
l_failed_rows NUMBER := 0;
l_num_found NUMBER;
BEGIN
-- Create a SQL Access Advisor task.
DBMS_ADVISOR.create_task (
advisor_name => DBMS_ADVISOR.sqlaccess_advisor,
task_name => l_taskname,
task_desc => l_task_desc); -- Reset the task.
DBMS_ADVISOR.reset_task(task_name => l_taskname); -- Create a workload.
SELECT COUNT(*)
INTO l_num_found
FROM user_advisor_sqlw_sum
WHERE workload_name = l_wkld_name; IF l_num_found = 0 THEN
DBMS_ADVISOR.create_sqlwkld(workload_name => l_wkld_name);
END IF; -- Link the workload to the task.
SELECT count(*)
INTO l_num_found
FROM user_advisor_sqla_wk_map
WHERE task_name = l_taskname
AND workload_name = l_wkld_name; IF l_num_found = 0 THEN
DBMS_ADVISOR.add_sqlwkld_ref(
task_name => l_taskname,
workload_name => l_wkld_name);
END IF; -- Set workload parameters.
DBMS_ADVISOR.set_sqlwkld_parameter(l_wkld_name, 'ACTION_LIST', DBMS_ADVISOR.ADVISOR_UNUSED);
DBMS_ADVISOR.set_sqlwkld_parameter(l_wkld_name, 'MODULE_LIST', DBMS_ADVISOR.ADVISOR_UNUSED);
DBMS_ADVISOR.set_sqlwkld_parameter(l_wkld_name, 'SQL_LIMIT', DBMS_ADVISOR.ADVISOR_UNLIMITED);
DBMS_ADVISOR.set_sqlwkld_parameter(l_wkld_name, 'ORDER_LIST', 'PRIORITY,OPTIMIZER_COST');
DBMS_ADVISOR.set_sqlwkld_parameter(l_wkld_name, 'USERNAME_LIST', DBMS_ADVISOR.ADVISOR_UNUSED);
DBMS_ADVISOR.set_sqlwkld_parameter(l_wkld_name, 'VALID_TABLE_LIST', DBMS_ADVISOR.ADVISOR_UNUSED); DBMS_ADVISOR.import_sqlwkld_sqlcache(l_wkld_name, 'REPLACE', 2, l_saved_rows, l_failed_rows); -- Set task parameters.
DBMS_ADVISOR.set_task_parameter(l_taskname, '_MARK_IMPLEMENTATION', 'FALSE');
DBMS_ADVISOR.set_task_parameter(l_taskname, 'EXECUTION_TYPE', 'INDEX_ONLY');
DBMS_ADVISOR.set_task_parameter(l_taskname, 'MODE', 'COMPREHENSIVE');
DBMS_ADVISOR.set_task_parameter(l_taskname, 'STORAGE_CHANGE', DBMS_ADVISOR.ADVISOR_UNLIMITED);
DBMS_ADVISOR.set_task_parameter(l_taskname, 'DML_VOLATILITY', 'TRUE');
DBMS_ADVISOR.set_task_parameter(l_taskname, 'ORDER_LIST', 'PRIORITY,OPTIMIZER_COST');
DBMS_ADVISOR.set_task_parameter(l_taskname, 'WORKLOAD_SCOPE', 'PARTIAL');
DBMS_ADVISOR.set_task_parameter(l_taskname, 'DEF_INDEX_TABLESPACE', DBMS_ADVISOR.ADVISOR_UNUSED);
DBMS_ADVISOR.set_task_parameter(l_taskname, 'DEF_INDEX_OWNER', DBMS_ADVISOR.ADVISOR_UNUSED);
DBMS_ADVISOR.set_task_parameter(l_taskname, 'DEF_MVIEW_TABLESPACE', DBMS_ADVISOR.ADVISOR_UNUSED);
DBMS_ADVISOR.set_task_parameter(l_taskname, 'DEF_MVIEW_OWNER', DBMS_ADVISOR.ADVISOR_UNUSED); -- Execute the task.
DBMS_ADVISOR.execute_task(task_name => l_taskname);
END;
/ -- Display the resulting script.
SET LONG 100000
SET PAGESIZE 50000
SELECT DBMS_ADVISOR.get_task_script('test_sql_access_task') AS script
FROM dual;
SET PAGESIZE 24
The value for the SET LONG
command should be adjusted to allow the whole script to be displayed.
Quick Tune
If you just want to tune an individual statement you can use the QUICK_TUNE
procedure as follows.
BEGIN
DBMS_ADVISOR.quick_tune(
advisor_name => DBMS_ADVISOR.SQLACCESS_ADVISOR,
task_name => 'emp_quick_tune',
attr1 => 'SELECT e.* FROM emp e WHERE UPPER(e.ename) = ''SMITH''');
END;
/
Any recommendations can then be displayed using the previous query with the correct task name specified.
Related Views
The following views can be used to display the SQL Access Advisor output without using Enterprise Manager or the get_task_script
function:
DBA_ADVISOR_TASKS
- Basic information about existing tasks.DBA_ADVISOR_LOG
- Status information about existing tasks.DBA_ADVISOR_FINDINGS
- Findings identified for an existing task.DBA_ADVISOR_RECOMMENDATIONS
- Recommendations for the problems identified by an existing task.
For more information see:
Hope this helps. Regards Tim...
SQL Access Advisor in Oracle Database 10g的更多相关文章
- Oracle调整顾问(SQL Tuning Advisor 与 SQL Access Advisor
在Oracle数据库出现性能问题时,使用Oracle本身的工具包,给出合理的调优建议是比较省力的做法. tuning advisor 是对输入的sql set的执行计划进行优化accsee advis ...
- SQL Tuning 基础概述09 - SQL Access Advisor
Oracle官方文档对SQL Access Advisor的描述如下: SQL Access Advisor, which is a tuning tool that provides advice ...
- 问题: Oracle Database 10g 未在当前操作系统中经过认证
问题: Oracle Database 10g 未在当前操作系统中经过认证 在Windows 7中安装Oracle 10g. 使用的Orcale版本是10g. 步骤1: 在Orcale官网上下载,下载 ...
- 用DBMS_ADVISOR.SQLACCESS_ADVISOR创建SQL Access Advisor访问优化建议
使用OEM方式来创建SQL Access Advisor访问优化建议,已经是四五年的事了,下面就来写写怎样使用DBMS_ADVISOR.SQLACCESS_ADVISOR来创建SQL Access A ...
- ORACLE DATABASE 10g EXPRESS EDITION LICENSE AGREEMENT
启动Tomcat之后出现全是英文错误: ORACLE DATABASE 10g EXPRESS EDITION LICENSE AGREEMENT To use this license, yo ...
- 手工执行sql tuning advisor和sql access advisor
sql tuning advisor:创建任务DECLARE my_task_name VARCHAR2(30); my_sqltext CLOB; BEGIN my_sqltext := 'SELE ...
- ORACLE DATABASE 10G FALSHBACK 知识整理
1.知识储备 1) 当出现介质损坏时(如数据文件丢失),任何闪回方法都毫无用处,只能执行标准的备份.还原与恢复. 2.SCN记录方法 SQL>variable x_scn number; ...
- SQL Access Advisor
1.概述: provides advice on improving the performance of a database through partitioning, materialized ...
- Oracle Database 10g Express Edition系统文件损坏的解决办法
1.检查错误代码:ora-10010 亦或是ora-10003,上网找响应的解决办法: 异常状态:登陆不上 常用的方法解决 (1)进入Oracle命令行模式 (2)Shutdown immedaite ...
随机推荐
- learnVUE-note
title: learnVUE-note date: 2018-02-27 15:57:37 tags: categories: 前端技术 --- 本文是自己在学习Vue中的 VUE事件处理 在事件处 ...
- Flask 系列之 SQLAlchemy
SQLAlchemy 是一种 ORM 框架,通过使用它,可以大大简化我们对数据库的操作,不用再写各种复杂的 sql语句 了. 说明 操作系统:Windows 10 Python 版本:3.7x 虚拟环 ...
- 消息队列redis
1.消息队列流程 2.接收用户请求 <?php header("Content-type:text/html;charset=utf-8"); //首先加载redis组键 $ ...
- JDK和Tomcat安装
JDK安装: 1,选择安装位置,其余默认安装,安装两次,一个是JDK,一个是JRE,安装在两个文件夹中. 2,配置环境变量: 1,新建一个变量,变量名:JAVA_HOME,变量值:C:\Program ...
- es6 语法 (模块化)
//export export let A=123; //导出 //导出函数 export function test(){ console.log('test'); } //导出类 export c ...
- JS检测浏览器Adobe Reader插件
Web应用中当我们希望向用户显示pdf文档时候,如果用户安装了Adobe Reader之类的pdf阅读器,就可以直接打开文档在浏览器中显示, 但是,当用户没有安装这类软件的时候,自然是打不开的,为了系 ...
- iOS ---------- 获取设备的各种信息
一.目录结构: 获取屏幕宽度与高度 获取设备版本号 获取iPhone名称 获取app版本号 获取电池电量 获取当前系统名称 获取当前系统版本号 获取通用的唯一识别码UUID 获取当前设备IP 获取总内 ...
- 我喜欢 Google Flutter
在 Google I/O ’17 上,Google 向我们介绍了 Flutter —— 一款新的用于创建移动应用的开源库. 正如你所想的那样,Flutter 是能够帮助创建拥有漂亮 UI 界面的跨平台 ...
- Visual Studio Team Services 动手实验
Visual Studio Team Services 动手实验 概述 为Visual Studio Team Services提供的动手实验,要完成实验首先需要满足以下条件: Visual Stud ...
- zabbix监控自动发现监控tomcat(V1)
背景说明: 由于zabbix监控使用自带的模版,只能监控主机上只有1个tomcat的场景适合,虽然网上很多朋友都是在每个监控项上面添加一个空格来解决问题.但是个人感觉这种方法还是蛮麻烦的,所以写一篇使 ...