锘??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#x4E45;&#x4E45;&#x7EFC;&#x5408;&#x4E45;&#x4E45;&#x7F8E;&#x5229;&#x575A;&#x5408;&#x4F17;&#x56FD;&#x2C;&#x4E45;&#x4E45;&#x8FD9;&#x91CC;&#x53EA;&#x6709;&#x7CBE;&#x54C1;&#x36;&#x2C;&#x61C2;&#x8272;&#x61;&#x76;&#x4E00;&#x533A;&#x4E8C;&#x533A;&#x4E09;&#x533A;&#x514D;&#x8D39;&#x770B;</title><link>http://www.aygfsteel.com/fjpan2002/category/17181.html</link><description /><language>zh-cn</language><lastBuildDate>Sat, 03 Mar 2007 04:32:04 GMT</lastBuildDate><pubDate>Sat, 03 Mar 2007 04:32:04 GMT</pubDate><ttl>60</ttl><item><title>Oracle鐨勪紭鍖栧櫒</title><link>http://www.aygfsteel.com/fjpan2002/articles/80915.html</link><dc:creator>鍕囨暍鐨勫績</dc:creator><author>鍕囨暍鐨勫績</author><pubDate>Mon, 13 Nov 2006 08:08:00 GMT</pubDate><guid>http://www.aygfsteel.com/fjpan2002/articles/80915.html</guid><wfw:comment>http://www.aygfsteel.com/fjpan2002/comments/80915.html</wfw:comment><comments>http://www.aygfsteel.com/fjpan2002/articles/80915.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/fjpan2002/comments/commentRss/80915.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/fjpan2002/services/trackbacks/80915.html</trackback:ping><description><![CDATA[Oracle鐨勪紭鍖栧櫒鏈変袱縐嶄紭鍖栨柟寮?鍗沖熀浜庤鍒欑殑浼樺寲鏂瑰紡(Rule-Based Optimization錛岀畝縐頒負RBO)鍜屽熀浜庝唬浠風殑浼樺寲鏂瑰紡(Cost-Based Optimization錛岀畝縐頒負CBO)錛屽湪Oracle8鍙婁互鍚庣殑鐗堟湰,Oracle寮哄垪鎺ㄨ崘鐢–BO鐨勬柟寮?
<p>聽聽聽 <strong>RBO鏂瑰紡錛?/strong>浼樺寲鍣ㄥ湪鍒嗘瀽SQL璇彞鏃?鎵�閬靛驚鐨勬槸Oracle鍐呴儴棰勫畾鐨勪竴浜涜鍒欍�傛瘮濡傛垜浠父瑙佺殑錛屽綋涓�涓獁here瀛愬彞涓殑涓�鍒楁湁绱㈠紩鏃跺幓璧扮儲寮曘�?/p><p>聽聽聽 <strong>CBO鏂瑰紡錛?/strong>瀹冩槸鐪嬭鍙ョ殑浠ｄ環(Cost),榪欓噷鐨勪唬浠蜂富瑕佹寚Cpu鍜屽唴瀛樸�備紭鍖栧櫒鍦ㄥ垽鏂槸鍚︾敤榪欑鏂瑰紡鏃?涓昏鍙傜収鐨勬槸琛ㄥ強绱㈠紩鐨勭粺璁′俊鎭�傜粺璁′俊鎭粰鍑鴻〃鐨勫ぇ灝忋�佹湁灝戣銆佹瘡琛岀殑闀垮害絳変俊鎭�傝繖浜涚粺璁′俊鎭搗鍒濆湪搴撳唴鏄病鏈夌殑錛屾槸鍋歛nalyze鍚庢墠鍑虹幇鐨勶紝寰堝鐨勬椂渚繃鏈熺粺璁′俊鎭細浠や紭鍖栧櫒鍋氬嚭涓�涓敊璇殑鎵ц璁″垝,鍥犱簺搴斿強鏃舵洿鏂拌繖浜涗俊鎭�?/p><p>聽聽聽 浼樺寲妯″紡鍖呮嫭Rule銆丆hoose銆丗irst rows銆丄ll rows鍥涚鏂瑰紡錛?/p><p>聽聽聽 <strong>Rule錛氬熀浜庤鍒欑殑鏂瑰紡銆?/strong></p><p>聽聽聽 <strong>Choolse錛?/strong>榛樿鐨勬儏鍐典笅Oracle鐢ㄧ殑渚挎槸榪欑鏂瑰紡銆傛寚鐨勬槸褰撲竴涓〃鎴栨垨绱㈠紩鏈夌粺璁′俊鎭紝鍒欒蛋CBO鐨勬柟寮忥紝濡傛灉琛ㄦ垨绱㈠紩娌＄粺璁′俊鎭紝琛ㄥ張涓嶆槸鐗瑰埆鐨勫皬錛岃�屼笖鐩稿簲鐨勫垪鏈夌儲寮曟椂錛岄偅涔堝氨璧扮儲寮曪紝璧癛BO鐨勬柟寮忋�?/p><p>聽聽聽 <strong>First Rows錛?/strong>瀹冧笌Choose鏂瑰紡鏄被浼肩殑錛屾墍涓嶅悓鐨勬槸褰撲竴涓〃鏈夌粺璁′俊鎭椂錛屽畠灝嗘槸浠ユ渶蹇殑鏂瑰紡榪斿洖鏌ヨ鐨勬渶鍏堢殑鍑犺錛屼粠鎬諱綋涓婂噺灝戜簡鍝嶅簲鏃墮棿銆?/p><p>聽聽聽 <strong>All Rows:</strong>涔熷氨鏄垜浠墍璇寸殑Cost鐨勬柟寮忥紝褰撲竴涓〃鏈夌粺璁′俊鎭椂錛屽畠灝嗕互鏈�蹇殑鏂瑰紡榪斿洖琛ㄧ殑鎵�鏈夌殑琛岋紝浠庢�諱綋涓婃彁楂樻煡璇㈢殑鍚炲悙閲忋�傛病鏈夌粺璁′俊鎭垯璧癛BO鐨勬柟寮忋�?/p><p>聽聽聽 <strong>璁懼畾閫夌敤鍝浼樺寲妯″紡錛?/strong></p><p>聽聽聽 A銆両nstance綰у埆鎴戜滑鍙互閫氳繃鍦╥nitSID.ora鏂囦歡涓瀹歄PTIMIZER_MODE=RULE/CHOOSE/FIRST_ROWS/ALL_ROWS濡傛灉娌¤瀹歄PTIMIZER_MODE鍙傛暟鍒欓粯璁ょ敤鐨勬槸Choose鏂瑰紡銆?br />聽聽聽 B銆丼essions綰у埆閫氳繃ALTER SESSION SET OPTIMIZER_MODE=RULE/CHOOSE/FIRST_ROWS/ALL_ROWS鏉ヨ瀹氥�?br />聽聽聽 C銆佽鍙ョ駭鍒敤Hint錛?*+ ... */錛夋潵璁懼畾</p><div style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><span style="COLOR: #008080">1</span><img id="Codehighlighter1_7_21_Open_Image" onclick="this.style.display='none'; Codehighlighter1_7_21_Open_Text.style.display='none'; Codehighlighter1_7_21_Closed_Image.style.display='inline'; Codehighlighter1_7_21_Closed_Text.style.display='inline';" src="http://www.aygfsteel.com/images/OutliningIndicators/ExpandedBlockStart.gif" align="top" /><img id="Codehighlighter1_7_21_Closed_Image" style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter1_7_21_Closed_Text.style.display='none'; Codehighlighter1_7_21_Open_Image.style.display='inline'; Codehighlighter1_7_21_Open_Text.style.display='inline';" src="http://www.aygfsteel.com/images/OutliningIndicators/ContractedBlock.gif" align="top" /><span style="COLOR: #0000ff">SELECT</span><span style="COLOR: #000000">聽</span><span id="Codehighlighter1_7_21_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">/**/</span><span id="Codehighlighter1_7_21_Open_Text"><span style="COLOR: #008080">/*</span><span style="COLOR: #008080">+聽ALL_ROWS聽</span><span style="COLOR: #008080">*/</span></span><span style="COLOR: #000000">聽employee_id,聽last_name,聽salary,聽job_id聽</span><span style="COLOR: #0000ff">FROM</span><span style="COLOR: #000000">聽employees聽</span><span style="COLOR: #0000ff">WHERE</span><span style="COLOR: #000000">聽employee_id聽</span><span style="COLOR: #808080">=</span><span style="COLOR: #000000">聽</span><span style="FONT-WEIGHT: bold; COLOR: #800000">183</span><span style="COLOR: #000000">;</span></div><img src ="http://www.aygfsteel.com/fjpan2002/aggbug/80915.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/fjpan2002/" target="_blank">鍕囨暍鐨勫績</a> 2006-11-13 16:08 <a href="http://www.aygfsteel.com/fjpan2002/articles/80915.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item></channel></rss>                    <footer>
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