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>&#x56FD;&#x4EA7;&#x7CBE;&#x54C1;&#x4E1D;&#x889C;&#x5728;&#x7EBF;&#x2C;&#x65E0;&#x7801;&#x65E5;&#x97E9;&#x7CBE;&#x54C1;&#x4E00;&#x533A;&#x4E8C;&#x533A;&#x514D;&#x8D39;&#x2C;&#x65E5;&#x97E9;&#x4E00;&#x533A;&#x4E8C;&#x533A;&#x7CBE;&#x54C1;&#x89C6;&#x9891;</title><link>http://www.aygfsteel.com/dongning/category/23320.html</link><description>鑰佽懀鐨勫揩涔愮敓媧?/description><language>zh-cn</language><lastBuildDate>Sun, 17 Jun 2007 11:36:47 GMT</lastBuildDate><pubDate>Sun, 17 Jun 2007 11:36:47 GMT</pubDate><ttl>60</ttl><item><title>SQL璇█鏁欑▼</title><link>http://www.aygfsteel.com/dongning/archive/2007/06/15/124430.html</link><dc:creator>鑰佽懀</dc:creator><author>鑰佽懀</author><pubDate>Fri, 15 Jun 2007 01:47:00 GMT</pubDate><guid>http://www.aygfsteel.com/dongning/archive/2007/06/15/124430.html</guid><wfw:comment>http://www.aygfsteel.com/dongning/comments/124430.html</wfw:comment><comments>http://www.aygfsteel.com/dongning/archive/2007/06/15/124430.html#Feedback</comments><slash:comments>2</slash:comments><wfw:commentRss>http://www.aygfsteel.com/dongning/comments/commentRss/124430.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/dongning/services/trackbacks/124430.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 鎽樿: 涓�銆佷粈涔堟槸SQL璇█錛?<br> 
<br>   SQL鏄粨鏋勫寲鏌ヨ璇█鐨勭緝鍐欙紙Structure Query Language錛夛紝綆�鍗曠殑璇達紝SQL鏄竴縐嶅叧緋繪暟鎹簱璇█錛屽畠鍙互璁塊棶浠ラ�昏緫闆嗙殑褰㈠紡鏈夊簭鍦板偍瀛樺湪鏁版嵁搴撶殑鏁版嵁錛岃繖浜涢�昏緫闆嗙О涓鴻〃銆傚疄闄呬笂SQL鏄竴縐嶈綆楁満緙栫▼璇█錛屼絾瀹冩瘮浼犵粺鐨勭紪紼嬭璦�錛屽錛孊ASIC錛孎ORTRAN絳夌畝鍗曠殑澶氥�傚彟澶朣QL鏄叧緋繪暟鎹簱璇█錛屼簡瑙ｄ簡SQL涔熷氨鐞嗚В浜嗗叧緋繪暟鎹簱錛屽洜姝ゅ湪鏁翠釜鍏崇郴鏁版嵁搴撲綋緋諱腑SQL鏄渶鍩虹銆佷篃鏄渶閲嶈鐨勯儴鍒嗐�?nbsp;&nbsp;<a href='http://www.aygfsteel.com/dongning/archive/2007/06/15/124430.html'>闃呰鍏ㄦ枃</a><img src ="http://www.aygfsteel.com/dongning/aggbug/124430.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/dongning/" target="_blank">鑰佽懀</a> 2007-06-15 09:47 <a href="http://www.aygfsteel.com/dongning/archive/2007/06/15/124430.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>ORACLE SQL鎬ц兘浼樺寲緋誨垪</title><link>http://www.aygfsteel.com/dongning/archive/2007/06/13/123873.html</link><dc:creator>鑰佽懀</dc:creator><author>鑰佽懀</author><pubDate>Wed, 13 Jun 2007 07:11:00 GMT</pubDate><guid>http://www.aygfsteel.com/dongning/archive/2007/06/13/123873.html</guid><wfw:comment>http://www.aygfsteel.com/dongning/comments/123873.html</wfw:comment><comments>http://www.aygfsteel.com/dongning/archive/2007/06/13/123873.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/dongning/comments/commentRss/123873.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/dongning/services/trackbacks/123873.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 鎽樿: ORACLE SQL鎬ц兘浼樺寲緋誨垪 (涓�)    black_snail錛堢炕璇戯級  
<br>  
<br>鍏抽敭瀛?    ORACEL SQL Performance tuning   
<br>鍑哄     http://www.dbasupport.com  
<br>
<br>1. 閫夌敤閫傚悎鐨凮RACLE浼樺寲鍣?
<br>
<br>   ORACLE鐨勪紭鍖栧櫒鍏辨湁3縐?
<br>   a.  RULE (鍩轟簬瑙勫垯)   b. COST (鍩轟簬鎴愭湰)  c. CHOOSE (閫夋嫨鎬? 
<br>   璁劇疆緙虹渷鐨勪紭鍖栧櫒,鍙互閫氳繃瀵筰nit.ora鏂囦歡涓璒PTIMIZER_MODE鍙傛暟鐨勫悇
<br>   縐嶅０鏄?濡俁ULE,COST,CHOOSE,ALL_ROWS,FIRST_ROWS . 浣犲綋鐒朵篃鍦⊿QL鍙?<br>   綰ф垨鏄細璇?session)綰у鍏惰繘琛岃鐩?
<br>   涓轟簡浣跨敤鍩轟簬鎴愭湰鐨勪紭鍖栧櫒(CBO, Cost-Based Optimizer) , 浣犲繀欏葷粡甯?<br>   榪愯analyze 鍛戒護,浠ュ鍔犳暟鎹簱涓殑瀵硅薄緇熻淇℃伅(object statistics)
<b&nbsp;&nbsp;<a href='http://www.aygfsteel.com/dongning/archive/2007/06/13/123873.html'>闃呰鍏ㄦ枃</a><img src ="http://www.aygfsteel.com/dongning/aggbug/123873.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/dongning/" target="_blank">鑰佽懀</a> 2007-06-13 15:11 <a href="http://www.aygfsteel.com/dongning/archive/2007/06/13/123873.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>鎬ц兘浼樺寲</title><link>http://www.aygfsteel.com/dongning/archive/2007/06/13/123868.html</link><dc:creator>鑰佽懀</dc:creator><author>鑰佽懀</author><pubDate>Wed, 13 Jun 2007 06:56:00 GMT</pubDate><guid>http://www.aygfsteel.com/dongning/archive/2007/06/13/123868.html</guid><wfw:comment>http://www.aygfsteel.com/dongning/comments/123868.html</wfw:comment><comments>http://www.aygfsteel.com/dongning/archive/2007/06/13/123868.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/dongning/comments/commentRss/123868.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/dongning/services/trackbacks/123868.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 鎽樿: 1銆佸簲鐢ㄧ▼搴忚璁＄殑浼樺寲璋冩暣
<br>搴旂敤紼嬪簭璁捐鐨勮皟鏁翠慨鏀瑰師鍒欙紱鏍規嵁涓嶅悓鐨勪笟鍔￠渶姹傦紝浠庝笉鍚岃搴﹁璁℃暟鎹簱錛屽叾璁捐鏍稿績鏄鏁版嵁鐨勮闂搷浣溿�傚父瑙佺殑浼樺寲鎵嬫鏈夛細
<br>錛?錛夊皢闀跨殑鏁版嵁鍒嗘鏀劇疆錛?<br>錛?錛夊敖閲忛噸澶嶅懡鍚嶇敤SQL璇彞錛屼互鍏呭垎鍒╃敤搴撻珮閫熺紦瀛橈紙Library Cache錛?
<br>錛?錛変紭鍖朣QL璇彞錛屽噺灝戞潯浠跺垽鏂殑浣跨敤銆?<br>2銆佸鏁版嵁璇誨啓鐨勪紭鍖栬皟鏁?<br>鍙互鍒╃敤ORACLE鏈韓甯︾殑utlbstat鍜孶tlestat榪欎袱涓猄QL紼嬪簭鍖呮敹闆嗘暟鎹簱榪愯鏃剁殑涓�浜涙�ц兘鐘跺喌&nbsp;&nbsp;<a href='http://www.aygfsteel.com/dongning/archive/2007/06/13/123868.html'>闃呰鍏ㄦ枃</a><img src ="http://www.aygfsteel.com/dongning/aggbug/123868.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/dongning/" target="_blank">鑰佽懀</a> 2007-06-13 14:56 <a href="http://www.aygfsteel.com/dongning/archive/2007/06/13/123868.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>鏈枃浠ラ棶絳旂殑鏂瑰紡闃愯堪浜哋racle騫惰鏈嶅姟鍣ㄧ殑鐩稿叧姒傚康</title><link>http://www.aygfsteel.com/dongning/archive/2007/06/13/123867.html</link><dc:creator>鑰佽懀</dc:creator><author>鑰佽懀</author><pubDate>Wed, 13 Jun 2007 06:53:00 GMT</pubDate><guid>http://www.aygfsteel.com/dongning/archive/2007/06/13/123867.html</guid><wfw:comment>http://www.aygfsteel.com/dongning/comments/123867.html</wfw:comment><comments>http://www.aygfsteel.com/dongning/archive/2007/06/13/123867.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/dongning/comments/commentRss/123867.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/dongning/services/trackbacks/123867.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 鎽樿: 1銆佷粈涔堟槸OPS
<br>OPS(Oracle Parallel Server)鍙互璁╀綅浜庝笉鍚岀郴緇熺殑澶氫釜瀹炰緥鍚屾椂璁塊棶鍚屼竴涓暟鎹簱銆傚茍琛屾湇鍔″櫒鍙互鏈夋晥鍦版彁楂樼郴緇熺殑鍙敤鎬у拰瀵瑰緋葷粺鐨勮闂�ц兘錛屼絾鏄紝濡傛灉浣犵殑鏁版嵁娌℃湁鍋氬緢濂界殑鍒嗗壊錛屾�ц兘鍙兘榪樹細涓嬮檷銆?<br>瀹夎OPS鏃訛紝澶氫釜瀹炰緥mount鍚屼竴鏁版嵁搴撴枃浠訛紝瀹炰緥闂寸殑閫氳鐢卞垎甯冨紡閿佺鐞嗗櫒錛圖LM錛夋潵綆＄悊銆傞渶瑕佹敞鎰忕殑鏄垎甯冨紡閿佺鐞嗗櫒涓庝綘鎵�浣跨敤鐨勭‖浠跺拰鎿嶄綔緋葷粺鏈夌潃瀵嗗垏鐨勫叧緋匯�備負浜嗙‘瀹氬涓紒鍥懼悓鏃朵慨鏀瑰悓涓�鏁版嵁鐨勫疄渚嬶紝Oracle浣跨敤浜嗗崄涓悗鍙拌繘紼嬶細LCK0-LCK9錛屾潵閿佸畾鏌愪竴瀹炰緥鎵�浣跨敤鐨勮祫婧愩�?<br>OPS涓昏鐢ㄤ簬UNIX/LINUX闆嗙兢鐜涓�?<br>&nbsp;&nbsp;<a href='http://www.aygfsteel.com/dongning/archive/2007/06/13/123867.html'>闃呰鍏ㄦ枃</a><img src ="http://www.aygfsteel.com/dongning/aggbug/123867.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/dongning/" target="_blank">鑰佽懀</a> 2007-06-13 14:53 <a href="http://www.aygfsteel.com/dongning/archive/2007/06/13/123867.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>鏌ヨ琛ㄧ┖闂?/title><link>http://www.aygfsteel.com/dongning/archive/2007/06/13/123866.html</link><dc:creator>鑰佽懀</dc:creator><author>鑰佽懀</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[&nbsp;&nbsp;&nbsp;&nbsp; 鎽樿: 1銆佹煡鐪嬭〃絀洪棿鐨勫悕縐板強澶у皬   
<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   
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