ï»??xml version="1.0" encoding="utf-8" standalone="yes"?>国产99久久久国产精品免费看,欧美性xxxxx,日韩女优视频免费观看http://www.aygfsteel.com/dongning/老董的快乐生‹z?/description>zh-cnSat, 07 Jun 2025 04:25:58 GMTSat, 07 Jun 2025 04:25:58 GMT60SQL语言教程http://www.aygfsteel.com/dongning/archive/2007/06/15/124430.html老董老董Fri, 15 Jun 2007 01:47:00 GMThttp://www.aygfsteel.com/dongning/archive/2007/06/15/124430.htmlhttp://www.aygfsteel.com/dongning/comments/124430.htmlhttp://www.aygfsteel.com/dongning/archive/2007/06/15/124430.html#Feedback4http://www.aygfsteel.com/dongning/comments/commentRss/124430.htmlhttp://www.aygfsteel.com/dongning/services/trackbacks/124430.html
SQL是结构化查询语言的羃写（Structure Query LanguageåQ‰ï¼Œ½Ž€å•çš„è¯ß_(d¨¢)¼ŒSQL是一¿Uå…³¾pÀL•°æ®åº“语言åQŒå®ƒå¯ä»¥è®‰K—®ä»¥é€»è¾‘集的形式有序地储存在数据库的数据åQŒè¿™äº›é€»è¾‘集称ä¸ø™¡¨ã€‚实际上SQL是一¿Uè®¡½Ž—机¾~–程语言åQŒä½†å®ƒæ¯”传统的编½E‹è¯­­a€åQŒå¦‚åQŒBASICåQŒFORTRAN½{‰ç®€å•çš„多。另外SQL是关¾pÀL•°æ®åº“语言åQŒäº†(ji¨£n)解了(ji¨£n)SQL也就理解äº?ji¨£n)å…³¾pÀL•°æ®åº“åQŒå› æ­¤åœ¨æ•´ä¸ªå…³ç³»æ•°æ®åº“体¾pÖM¸­SQL是最基础、也是最重要的部分ã€?nbsp; é˜…读全文

]]>ORACLE SQL性能优化¾pÕdˆ—http://www.aygfsteel.com/dongning/archive/2007/06/13/123873.html老董老董Wed, 13 Jun 2007 07:11:00 GMThttp://www.aygfsteel.com/dongning/archive/2007/06/13/123873.htmlhttp://www.aygfsteel.com/dongning/comments/123873.htmlhttp://www.aygfsteel.com/dongning/archive/2007/06/13/123873.html#Feedback0http://www.aygfsteel.com/dongning/comments/commentRss/123873.htmlhttp://www.aygfsteel.com/dongning/services/trackbacks/123873.html
关键� ORACEL SQL Performance tuning
出处 http://www.dbasupport.com

1. 选用适合的ORACLE优化�

ORACLE的优化器共有3¿U?
a. RULE (åŸÞZºŽè§„则) b. COST (åŸÞZºŽæˆæœ¬) c. CHOOSE (选择æ€?
讄¡½®¾~ºçœçš„优化器,可以通过对init.oraæ–‡äšg中OPTIMIZER_MODE参数的各
¿Uå£°æ˜?如RULE,COST,CHOOSE,ALL_ROWS,FIRST_ROWS . 你当然也在SQLå?
¾U§æˆ–是会(x¨¬)è¯?session)¾U§å¯¹å…¶è¿›è¡Œè¦†ç›?
ä¸ÞZº†(ji¨£n)使用åŸÞZºŽæˆæœ¬çš„优化器(CBO, Cost-Based Optimizer) , ä½ å¿…™åȝ»å¸?
˜qè¡Œanalyze 命ä×o(h¨´),以增加数据库中的对象¾lŸè®¡ä¿¡æ¯(object statistics) 阅读全文

]]>性能优化http://www.aygfsteel.com/dongning/archive/2007/06/13/123868.html老董老董Wed, 13 Jun 2007 06:56:00 GMThttp://www.aygfsteel.com/dongning/archive/2007/06/13/123868.htmlhttp://www.aygfsteel.com/dongning/comments/123868.htmlhttp://www.aygfsteel.com/dongning/archive/2007/06/13/123868.html#Feedback0http://www.aygfsteel.com/dongning/comments/commentRss/123868.htmlhttp://www.aygfsteel.com/dongning/services/trackbacks/123868.html应用½E‹åºè®¾è®¡çš„调整修改原则；æ ÒŽ(gu¨©)®ä¸åŒçš„业务需求，从不同角度设计数据库åQŒå…¶è®¾è®¡æ ¸å¿ƒ(j¨©)是对数据的访问操作。常见的优化手段有：(x¨¬)
åQ?åQ‰å°†é•¿çš„数据分段攄¡½®åQ?
åQ?åQ‰å°½é‡é‡å¤å‘½åç”¨SQL语句åQŒä»¥å……分利用库高速缓存（Library CacheåQ?
åQ?åQ‰ä¼˜åŒ–SQL语句åQŒå‡ž®‘条件判断的使用ã€?
2、对数据è¯Õd†™çš„优化调æ•?
可以利用ORACLE本èín带的utlbstatå’ŒUtlestat˜q™ä¸¤ä¸ªSQL½E‹åºåŒ…收集数据库˜qè¡Œæ—¶çš„一些性能状况  é˜…读全文

]]>本文以问½{”的方式阐述äº?ji¨£n)Oracleòq¶è¡ŒæœåŠ¡å™¨çš„相关概念http://www.aygfsteel.com/dongning/archive/2007/06/13/123867.html老董老董Wed, 13 Jun 2007 06:53:00 GMThttp://www.aygfsteel.com/dongning/archive/2007/06/13/123867.htmlhttp://www.aygfsteel.com/dongning/comments/123867.htmlhttp://www.aygfsteel.com/dongning/archive/2007/06/13/123867.html#Feedback0http://www.aygfsteel.com/dongning/comments/commentRss/123867.htmlhttp://www.aygfsteel.com/dongning/services/trackbacks/123867.htmlOPS(Oracle Parallel Server)可以让位于不同系¾lŸçš„多个实例同时讉K—®åŒä¸€ä¸ªæ•°æ®åº“。åƈ行服务器可以有效地提高系¾lŸçš„可用性和对多¾pȝ»Ÿçš„访问性能åQŒä½†æ˜¯ï¼Œå¦‚果你的数据没有做很好的分割åQŒæ€§èƒ½å¯èƒ½˜q˜ä(sh¨´)¼š(x¨¬)下降ã€?
安装OPSæ—Óž¼Œå¤šä¸ªå®žä¾‹mount同一数据库文ä»Óž¼Œå®žä¾‹é—´çš„通讯由分布式锁管理器åQˆDLMåQ‰æ¥½Ž¡ç†ã€‚需要注意的是分布式锁管理器与你所使用的硬件和操作¾pȝ»Ÿæœ‰ç€å¯†åˆ‡çš„å…³¾p…R€‚äØ“(f¨´)äº?ji¨£n)确定多个企囑֐Œæ—¶ä¿®æ”¹åŒä¸€æ•°æ®çš„实例，Oracle使用äº?ji¨£n)十个后台进½E‹ï¼š(x¨¬)LCK0-LCK9åQŒæ¥é”å®šæŸä¸€å®žä¾‹æ‰€ä½¿ç”¨çš„资源ã€?
OPS主要用于UNIX/LINUX集群环境中�
  é˜…读全文

]]>查询表空é—?/title><link>http://www.aygfsteel.com/dongning/archive/2007/06/13/123866.html</link><dc:creator>老董</dc:creator><author>老董</author><pubDate>Wed, 13 Jun 2007 06:52:00 GMT</pubDate><guid>http://www.aygfsteel.com/dongning/archive/2007/06/13/123866.html</guid><wfw:comment>http://www.aygfsteel.com/dongning/comments/123866.html</wfw:comment><comments>http://www.aygfsteel.com/dongning/archive/2007/06/13/123866.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/dongning/comments/commentRss/123866.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/dongning/services/trackbacks/123866.html</trackback:ping><description><![CDATA[     摘要: 1、查看表½Iºé—´çš„名¿U°åŠ(qi¨¢ng)大小 <br>select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size <br>from dba_tablespaces t, dba_data_files d <br>where t.tablespace_name = d.tablespace_name <br>group by t.tablespace_name;   <a href='http://www.aygfsteel.com/dongning/archive/2007/06/13/123866.html'>阅读全文</a><img src ="http://www.aygfsteel.com/dongning/aggbug/123866.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/dongning/" target="_blank">老董</a> 2007-06-13 14:52 <a href="http://www.aygfsteel.com/dongning/archive/2007/06/13/123866.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>在STRUTS讄¡½®session的过期时é—?/title><link>http://www.aygfsteel.com/dongning/archive/2007/06/13/123796.html</link><dc:creator>老董</dc:creator><author>老董</author><pubDate>Wed, 13 Jun 2007 02:30:00 GMT</pubDate><guid>http://www.aygfsteel.com/dongning/archive/2007/06/13/123796.html</guid><wfw:comment>http://www.aygfsteel.com/dongning/comments/123796.html</wfw:comment><comments>http://www.aygfsteel.com/dongning/archive/2007/06/13/123796.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/dongning/comments/commentRss/123796.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/dongning/services/trackbacks/123796.html</trackback:ping><description><![CDATA[     摘要: 在web.xml中设¾|? <br> <session-config> <br> <session-timeout>20</session-timeout> <br> </session-config> <br>其中çš?0为分钟，若设¾|®äØ“(f¨´)-1的话ž®±æ˜¯sessionæ°æ€¸˜q‡æœŸ  <a href='http://www.aygfsteel.com/dongning/archive/2007/06/13/123796.html'>阅读全文</a><img src ="http://www.aygfsteel.com/dongning/aggbug/123796.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/dongning/" target="_blank">老董</a> 2007-06-13 10:30 <a href="http://www.aygfsteel.com/dongning/archive/2007/06/13/123796.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Hibernate快速入é—?/title><link>http://www.aygfsteel.com/dongning/archive/2007/06/08/122839.html</link><dc:creator>老董</dc:creator><author>老董</author><pubDate>Fri, 08 Jun 2007 05:47:00 GMT</pubDate><guid>http://www.aygfsteel.com/dongning/archive/2007/06/08/122839.html</guid><wfw:comment>http://www.aygfsteel.com/dongning/comments/122839.html</wfw:comment><comments>http://www.aygfsteel.com/dongning/archive/2007/06/08/122839.html#Feedback</comments><slash:comments>2</slash:comments><wfw:commentRss>http://www.aygfsteel.com/dongning/comments/commentRss/122839.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/dongning/services/trackbacks/122839.html</trackback:ping><description><![CDATA[     摘要: 其实Hibernate本èín是个独立的框æžÓž¼Œå®ƒä¸éœ€è¦ä“Q何web server或application server的支持。然而，大多数的Hibernate入门介绍都加入了(ji¨£n)很多非Hibernate的东西，比如: Tomcat, Eclipse, Log4J,Struts, XDoclet, 甚至JBoss。这å®ÒŽ(gu¨©)˜“让äh产生Hibernate复杂难懂的误解，特别是打å‡ÖMº†(ji¨£n)初学者的¿U¯æžæ€§ã€?<br>　　在这½‹‡æ–‡ç« å°†ä¸æ¶‰å?qi¨¢ng)Eclipse, log4j, Struts, Tomcat, XDocletåQŒå’ŒJBoss。本文的目的是演½CÞZ¸€ä¸‹Hibernate的安装过½E‹ä»¥å?qi¨¢ng)最基本的功能，从而给初学者一个低得不能再低的入门门槛 <br>  <a href='http://www.aygfsteel.com/dongning/archive/2007/06/08/122839.html'>阅读全文</a><img src ="http://www.aygfsteel.com/dongning/aggbug/122839.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/dongning/" target="_blank">老董</a> 2007-06-08 13:47 <a href="http://www.aygfsteel.com/dongning/archive/2007/06/08/122839.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>手低眼高 初学者学ä¹?f¨¤n)Hibernateçš„æ–¹æ³?/title><link>http://www.aygfsteel.com/dongning/archive/2007/06/08/122837.html</link><dc:creator>老董</dc:creator><author>老董</author><pubDate>Fri, 08 Jun 2007 05:40:00 GMT</pubDate><guid>http://www.aygfsteel.com/dongning/archive/2007/06/08/122837.html</guid><wfw:comment>http://www.aygfsteel.com/dongning/comments/122837.html</wfw:comment><comments>http://www.aygfsteel.com/dongning/archive/2007/06/08/122837.html#Feedback</comments><slash:comments>3</slash:comments><wfw:commentRss>http://www.aygfsteel.com/dongning/comments/commentRss/122837.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/dongning/services/trackbacks/122837.html</trackback:ping><description><![CDATA[     摘要: Hibernate入门å®ÒŽ(gu¨©)˜“åQŒæŽŒæ¡ç²¾é€šæˆ‘也不敢自夸。我½W¬ä¸€éçœ‹Hibernate文档的时候也觉得很吃力，但不是因为Hibernate难掌握而感到吃力，是因为Hibernate文档处处都是持久层设计的¾léªŒå’Œæœ€ä½?j¨©ng)_®žè·üc(di¨£n)€? <br>　　Hibernate文档准确的来è¯ß_(d¨¢)¼Œ¾lå¤§éƒ¨åˆ†å†…容都在讲对象的持久层设计，而不是简单的Hibernate使用åQŒä‹É用问题查Java docž®±å¤Ÿäº?ji¨£n)。所以学ä¹?f¨¤n)HibernateåQŒä¸»è¦æ˜¯åœ¨å­¦ä¹?f¨¤n)持久层的设计模式，如果你把Hibernate文档都看完了(ji¨£n)åQŒè¿˜æ•´å¤©åªä¼š(x¨¬)提那äº?Hibernate的配¾|®é—®é¢˜ï¼ŒHibernate的类调用问题åQŒæˆ‘觉得˜q™æ ·çš„äh˜q˜æ²¡æœ‰çœŸæ­£çš„入门åQŒç®—是白学了(ji¨£n)ã€?<br>  <a href='http://www.aygfsteel.com/dongning/archive/2007/06/08/122837.html'>阅读全文</a><img src ="http://www.aygfsteel.com/dongning/aggbug/122837.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/dongning/" target="_blank">老董</a> 2007-06-08 13:40 <a href="http://www.aygfsteel.com/dongning/archive/2007/06/08/122837.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Hibernate­‘…çñ”½Ž€ä»?/title><link>http://www.aygfsteel.com/dongning/archive/2007/06/08/122834.html</link><dc:creator>老董</dc:creator><author>老董</author><pubDate>Fri, 08 Jun 2007 05:33:00 GMT</pubDate><guid>http://www.aygfsteel.com/dongning/archive/2007/06/08/122834.html</guid><wfw:comment>http://www.aygfsteel.com/dongning/comments/122834.html</wfw:comment><comments>http://www.aygfsteel.com/dongning/archive/2007/06/08/122834.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/dongning/comments/commentRss/122834.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/dongning/services/trackbacks/122834.html</trackback:ping><description><![CDATA[     摘要: Hibernate™å‘֐æ€ä¹‰å†¬çœ çš„意思，ç›æ€¿¡å®ƒçš„创造者的用意在于用这个工具将数据库连接持久化层冬眠，关于Hibernate¾|‘上争论很多åQŒæœ‰äºø™¯´å…¶äØ“(f¨´)工具åQŒæœ‰äºø™¯´å…¶äØ“(f¨´)框架åQŒæˆ‘ç›æ€¿¡ä¸€ä¸ªäh有一个äh理解问题的角度，只要处理问题的方法正¼‹®å°±å¯ä»¥äº?ji¨£n)。Hibernate是采用ORM映射机制的持久层开发工å…øP¼Œå®ƒæ˜¯JAVA应用和关¾pÀL•°æ®åº“之前的桥梁，负责JAVA对象和关¾pÀL•°æ®ä¹‹é—´çš„映射。内部封装了(ji¨£n)JDBC讉K—®æ•°æ®åº“的操作åQŒå‘上层应用提供äº?ji¨£n)面向对象的数据库访问APIåQŒåœ¨JAVA应用中ä‹É用到Hibernate包含如下步骤ã€?<br>  <a href='http://www.aygfsteel.com/dongning/archive/2007/06/08/122834.html'>阅读全文</a><img src ="http://www.aygfsteel.com/dongning/aggbug/122834.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/dongning/" target="_blank">老董</a> 2007-06-08 13:33 <a href="http://www.aygfsteel.com/dongning/archive/2007/06/08/122834.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item></channel></rss> <footer> <div class="friendship-link"> <a href="http://www.aygfsteel.com/" title="狠狠久久亚洲欧美专区_中文字幕亚洲综合久久202_国产精品亚洲第五区在线_日本免费网站视频">狠狠久久亚洲欧美专区_中文字幕亚洲综合久久202_国产精品亚洲第五区在线_日本免费网站视频</a> </div> </footer> Ö÷Õ¾Ö©Öë³ØÄ£°å£º <a href="http://" target="_blank">ÔƸ¡ÊÐ</a>| <a href="http://" target="_blank">Î÷ƽÏØ</a>| <a href="http://" target="_blank">³µÖÂ</a>| <a href="http://" target="_blank">ÎôÑôÏØ</a>| <a href="http://" target="_blank">´óÆÒÇø</a>| <a href="http://" target="_blank">ÔúÀ¼ÍÍÊÐ</a>| <a href="http://" target="_blank">Î÷°²ÊÐ</a>| <a href="http://" target="_blank">ËæÖÝÊÐ</a>| <a href="http://" target="_blank">»ôÇñÏØ</a>| <a href="http://" target="_blank">»³»¯ÊÐ</a>| <a href="http://" target="_blank">ƽ°²ÏØ</a>| <a href="http://" target="_blank">É̶¼ÏØ</a>| <a href="http://" target="_blank">¼¯ÏÍÏØ</a>| <a href="http://" target="_blank">ÇìÔÆÏØ</a>| <a href="http://" target="_blank">ÃÏÖÝÊÐ</a>| <a href="http://" target="_blank">Ôú³ÌØÆì</a>| <a href="http://" target="_blank">·âÇðÏØ</a>| <a href="http://" target="_blank">À³ÑôÊÐ</a>| <a href="http://" target="_blank">ÆÕÀ¼ÏØ</a>| <a href="http://" target="_blank">Çú¾¸ÊÐ</a>| <a href="http://" target="_blank">¶ëüɽÊÐ</a>| <a href="http://" target="_blank">¼ªÄ¾ÄËÏØ</a>| <a href="http://" target="_blank">ͼľÊæ¿ËÊÐ</a>| <a href="http://" target="_blank">ÒÁÄþÊÐ</a>| <a href="http://" target="_blank">Óå±±Çø</a>| <a href="http://" target="_blank">Ïå·®ÊÐ</a>| <a href="http://" target="_blank">ÅÍʯÊÐ</a>| <a href="http://" target="_blank">Õò°²ÏØ</a>| <a href="http://" target="_blank">ÖñɽÏØ</a>| <a href="http://" target="_blank">Û¶ÑôÏØ</a>| <a href="http://" target="_blank">¼ÎÐËÊÐ</a>| <a href="http://" target="_blank">кÓÏØ</a>| <a href="http://" target="_blank">¾¸Ô¶ÏØ</a>| <a href="http://" target="_blank">ÜÝƽÏØ</a>| <a href="http://" target="_blank">ÄáÂêÏØ</a>| <a href="http://" target="_blank">Å®ÐÔ</a>| <a href="http://" target="_blank">ºº´¨ÊÐ</a>| <a href="http://" target="_blank">ºÏ´¨ÊÐ</a>| <a href="http://" target="_blank">´ëÃÀÏØ</a>| <a href="http://" target="_blank">ÓͼâÍúÇø</a>| <a href="http://" target="_blank">ÍÁĬÌØ×óÆì</a>| <script> (function(){ var bp = document.createElement('script'); var curProtocol = window.location.protocol.split(':')[0]; if (curProtocol === 'https') { bp.src = 'https://zz.bdstatic.com/linksubmit/push.js'; } else { bp.src = 'http://push.zhanzhang.baidu.com/push.js'; } var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(bp, s); })(); </script> </body>