表连接的方式如join,semi-join,outer-join,anti-join(转载)
摘要:本文系转载,如果有侵犯您知识产权,烦请及时通知本人,本人将即刻停止侵权行为;转载网址:http://longmans1985.blog.163.com/blog/static/70605475201121711229521/ http://blog.itpub.net/post/901/12680 使用exists、not eixsts不能用到semi-join、anti-join的一些情况讨论 http://www.itpub.net/thread-438650-1-1.html: 简单介绍join,outer-join,semi-join,anti-j...
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2013-04-17 07:05
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oracle优化器以及SQL共享(转载)
摘要:本人系转载自:http://www.2cto.com/database/201108/102093.html http://wenku.baidu.com/view/4f429e126edb6f1aff001f75.html http://www.cnblogs.com/dongzhiquan/archive/2012/01/20/2328365.html http://www.itpub.net/thread-478999-1-1.html1、oracle的优化器oracle有三种优化器RULECOSTCHOOSE通过参数OPTIMI...
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2012-12-19 07:57
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执行计划中的参数解释
摘要:执行计划中的各个参数解释:一、Recursive calls (递归调用)1、参考:Oracle Database Reference, 10g Release 2 (10.2).pdf第916页 Number of recursive calls generated at both the userand system level. Oracle maintains tables used forinternal processing. When Oracle needs to make achange to these tables, it internally generates an.
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2012-12-13 07:30
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Performance Tuning for Oracle
摘要:http://andrewfraserdba.com/training/
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2012-12-05 21:57
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Oracle SQL baseline--调整执行计划的三种方法(转载)
摘要:转载网址:http://nyoug.org/Presentations/2011/March/Malik_SQL_Plan_Management.pdfSQL_Plan_Managementhttp://yumianfeilong.com/html/2011/01/07/484.htmlhttp://www.2cto.com/database/201205/133454.htmlhttp://blog.sina.com.cn/s/blog_6561845301012u2k.htmlhttp://blog.sina.com.cn/s/blog_6561845301012u2a.htmlhttp:
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2012-12-01 22:58
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Oracle B-tree、位图、全文索引三大索引性能比较及优缺点汇总(转载)
摘要:转载网址:http://www.itpub.net/thread-1700144-1-1.html
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2012-12-01 09:06
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Efficient SQL Statements
摘要:声明:本文为转载,如果有侵犯知识版权,请通知本人,本人将即刻停止侵权行为:参考网址:http://www.oracle-base.com/articles/misc/efficient-sql-statements.php http://my.oschina.net/xianggao/blog/87216?from=20121111参考文档:Oracle Database Performance Tuning Guide, 10g Release 2 (10.2).pdf第11张SQL Tuning Overview的Developing Efficient SQL Statem...
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2012-11-18 11:38
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Oracle 分析函数
摘要:分析函数官方帮助文档:http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions001.htm#SQLRF06174一、Top-N Queries,row_number()参考网址:http://www.oracle-base.com/articles/misc/top-n-queries.php1、row_number() TheROW_NUMBERanalytic function is similar to theROWNUMpseudocolumn in that it assigns a unique number.
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2012-11-15 06:56
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Index Clustering Factor -- Why it Matters
摘要:声明:本文为转载,如果有侵犯知识版权,请通知本人,本人将即刻停止侵权行为:转载网址:http://www.dbasupport.com/forums/archive/index.php/t-38893.htmlIntroduction The index custering factor is a key statistic that can improve both the Oracle optimizer's performance, and the technician's understanding of the utility of an index. index C
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2012-09-08 22:21
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Oracle Index Clustering Factor 说明(转载)
摘要:Oracle Index Clustering Factor
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2012-09-08 21:55
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Oracle Statistic 统计信息 小结(转载)
摘要:声明:本文为转载,如果有侵犯知识版权,请通知本人,本人将即刻停止侵权行为:转载网址:http://blog.csdn.net/tianlesoftware/article/details/4668723 sql tuning advisor in 10g:http://www.oracle-developer.net/display.php?id=317本文中提到的一些专业术语,可以查看Oracle Database Performance Tuning Guide, 10g Release 2 (10.2).pdf第14章节Managing Optimizer Statistics一...
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2012-09-06 06:57
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Understanding Access Paths for the Query Optimizer
摘要:参考资料:Oracle Database Performance Tuning Guide, 10g Release 2 (10.2).pdf:265页参考网址:http://www.dbaroad.me/?p=4862 http://www.dbaroad.me/archives/2009/06/index_full_scan.html(常见索引扫描浅析(三):INDEX FULL SCAN) http://wenku.baidu.com/view/4bce2240be1e650e52ea99c9.html(Oracle优化-英文官方文档) http://blo...
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2012-08-29 05:40
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Reading and Understanding Execution Plans
摘要:本文翻译来自于:Oracle Database Performance Tuning Guide, 10g Release 2 (10.2).pdf 官方下载地址:10g:http://www.oracle.com/pls/db102/homepage 11g:http://www.oracle.com/pls/db111/homepage To execute a SQL statement, Oracle might need to perform many steps. Each of thesesteps either retrieves rows...
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2012-08-27 07:17
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Oracle SQL Tuning Overview
摘要:Oracle执行SQL语句的步骤如下:1. 用户传送要执行的SQL语句给SQL引擎2. SQL引擎要求查询优化器提供执行计划3. 查询优化取得系统统计信息、SQL语句引用对象的对象统计信息、SQL概要和构成执行环境的初始化参数4. 查询优化器分析SQL语句并产生执行计划5. 将执行计划传递给SQL引擎6. SQL引擎执行SQL语句参考:Oracle Database Performance Tuning Guide, 10g Release 2 (10.2)下载地址:http://www.oracle.com/pls/db102/homepage(一)、Developing Efficient
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2012-08-23 06:03
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Oracle优化
摘要:http://www.itpub.net/thread-1586113-1-1.html
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2012-08-09 06:22
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SET AUTOT ON无法使用解决方法,以及PLAN_TABLE的使用
摘要:提示:数据库中的"PUBLIC"用户是一个概念用户,如果要将权限授给每个用户,可将权限授予PUBLICGRANT ALL ON sys.plan_table TO public;参考网址:https://netfiles.uiuc.edu/jstrode/www/oraplus/plus_set_autotrace.htmlhttp://docs.oracle.com/cd/B19306_01/server.102/b14357/ch8.htm#i1037226http://docs.oracle.com/cd/B19306_01/server.102/b14200/sta
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2012-07-07 09:47
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SET AUTOTRACE(转载)
摘要:注意;*autotrace功能只能在SQL*PLUS里使用声明:本文为转载,如果有侵犯知识版权,请通知本人,本人将即刻停止侵权行为:网址;http://blog.csdn.net/huanghui22/article/details/1326227 https://netfiles.uiuc.edu/jstrode/www/oraplus/plus_set_autotrace.html http://www.cnblogs.com/chinhr/archive/2009/03/14/1412105.html http://www.linuxidc.com/Linux/2012-...
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2012-07-03 07:22
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Oracle index(转载)
摘要:本文系转载,如果有侵犯只是版权,请联系本人,本人将即刻停止侵权行为参考网址:http://liusuper.iteye.com/blog/219013 http://blog.csdn.net/bobo12082119/article/details/6303875 :oracle 索引常用命令 http://blog.csdn.net/bobo12082119/article/details/6302773 :oracle 索引介绍 http://blog.csdn.net/tianlesoftware/article/details/5347098#comments...
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2012-06-25 07:44
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30个Oracle语句优化规则详解(转载)
摘要:本文系转载,如果有侵犯只是版权,请联系本人,本人将即刻停止侵权行为http://blog.csdn.net/CompassButton/article/details/3766703http://www.searchdatabase.com.cn/showcontent_17103.htm
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2012-06-03 19:41
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