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琛ㄥ垎鏋愩?佺害鏉熷強琛ㄩ棿鍏崇郴聽
Oracle浣撶郴缁撴瀯1
Oracle浣撶郴缁撴瀯2聽
娴烽噺鏁版嵁搴撳強鍒嗗尯1聽
娴烽噺鏁版嵁搴撳強鍒嗗尯2聽
娴烽噺鏁版嵁搴撳強鍒嗗尯3聽
娴烽噺鏁版嵁搴撳強鍒嗗尯4聽
楂樼骇SQL浼樺寲(涓?)聽聽
楂樼骇SQL浼樺寲(浜?聽聽
楂樼骇SQL浼樺寲(涓? 甯哥敤浼樺寲宸ュ叿聽
PPT鍜屾簮鐮佷笅杞斤細聽聽聽聽http://sishuok.com/forum/posts/list/6365.html
閰嶅?瑙嗛?璇剧▼
聽聽聽聽Oracle鎬ц兘浼樺寲聽http://sishuok.com/product/601聽
聽聽聽聽娴烽噺鏁版嵁搴撳拰楂樼骇SQL浼樺寲聽http://sishuok.com/product/602
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1.聽绱㈠紩瀵逛笉绛夊彿鍜孨OT鐨勯檺鍒?/strong>
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1.聽绱㈠紩瀵逛笉绛夊彿鍜孨OT鐨勯檺鍒?/strong>
聽聽 RBO妯″紡涓嬶紝鎵ц?璁″垝濡備笅锛?/div>
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聽1.聽绱㈠紩瀵逛笉绛夊彿鍜孨OT鐨勯檺鍒?/strong>
聽聽 RBO妯″紡涓嬶紝鎵ц?鎯呭喌濡備笅锛?/div>
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聽聽
聽聽姝ゆ椂浣跨敤鍙橀?氬啓娉曠殑鑰楄垂涓猴細0.407/2.187=1.60%!
1.聽绱㈠紩瀵逛笉绛夊彿鍜孨OT鐨勯檺鍒?/strong>
聽聽 CBO妯″紡涓嬶紝鎵ц?鎯呭喌濡備笅锛?/div>
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姝ゆ椂浣跨敤鍙橀?氬啓娉曠殑鑰楄垂鑺傜害涓嶅埌0.03绉掞紝浣嗕緷鐒舵洿浼橈紝鏁呮?鎺ㄨ崘姝ょ?鍙橀?氬啓娉曪紝鍐嶇湅姝ゆ椂浣跨敤NOT锛?/div>
1.聽绱㈠紩瀵逛笉绛夊彿鍜孨OT鐨勯檺鍒?/strong>
聽聽 CBO妯″紡涓嬶紝鍦↗YJE鍒楃殑绱㈠紩涓婁娇鐢∟OT锛?/div>
聽聽涓轰娇鐢?lt;>鐨勶細0.156/0.329=47.42%!涓哄彉閫氬啓娉曠殑浣跨敤0.156/0.297=52.53%锛?span class="Apple-converted-space">聽鍥?/strong>聽姝よ繖绉嶅啓娉曟渶浼橈紒
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1.聽绱㈠紩瀵逛笉绛夊彿鍜孨OT鐨勯檺鍒?/strong>
聽聽 涓?鑸?紝WHERE鏉′欢涓?紝濡傛灉绱㈠紩鍒楁槸瀛楃?鍒楋紝浣跨敤NOT寰?寰?涔熶笉浼氫娇鐢ㄧ储寮曪細
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2.聽绱㈠紩瀵笽S NULL鐨勯檺鍒?/strong>
聽聽 涓?鑸?潵璇达紝濡傛灉WHERE瀛愬彞鍩轰簬鐨勫垪鏄?彲绌虹殑鍒楋紝涓斿叾寤虹珛浜嗙储寮曪紝濡傛灉浣跨敤浜咺S NULL锛岀敱浜嶯ULL鐨勫垪鏈?韩涓嶅寘鍚?湪绱㈠紩涓?紝鍥犳?鏃犳硶鍒╃敤绱㈠紩銆?/div>聽
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3.聽绱㈠紩瀵瑰嚱鏁扮殑闄愬埗
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鎵ц?璁″垝鎯呭喌濡備笅锛?/div>
聽聽
杩欐槸鍥犱负璇ョ储寮曟槸甯歌?b-tree绱㈠紩锛屽?璇ュ垪鍦╓HERE瀛愬彞涓?娇鐢ㄤ簡鍑芥暟锛屽垯涓嶈兘浣跨敤绱㈠紩銆傚洜姝わ紝瀵瑰湪WHERE瀛愬彞涓?粡甯歌?浣跨敤鍑芥暟鏃讹紝搴旇?寤虹珛鍩轰簬鍑芥暟鐨勭储寮曪紝涓?span class="Apple-converted-space">聽鍙?湁褰撴煡璇㈣?鍙ュ寘鍚??鍑芥暟鎴栬?呰〃杈惧紡鏃讹紝鍩轰簬鍑芥暟鐨勭储寮曟墠浼氳?璋?/strong>聽鐢?/strong>銆傝?鎯呰?鍙傝?绱㈠紩閮ㄥ垎鐨勭悊璁鸿?瑙ｏ紒
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鍒涘缓骞朵娇鐢ㄥ嚱鏁扮储寮曪細
聽鍒涘缓骞朵娇鐢ㄥ嚱鏁扮储寮曪細
姝ゆ椂浣跨敤鍩轰簬鍑芥暟鐨勭储寮曟晥鐜囨槸鍘熸潵鐨?.782/0.188锛?4.78锛佸憲锛?/div>
4.聽绱㈠紩瀵逛笉鍖归厤鏁版嵁绫诲瀷鐨勯檺鍒?/strong>
鍏堢湅鎵ц?鎯呭喌锛?/div>聽聽
涓嶅尮閰嶇殑绫诲瀷鎵ц?鐨勬椂闂存槸鍖归厤鐨勭被鍨嬬殑聽2.187/0.266=8.2聽鍊嶏紒
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鍐嶇湅鎵ц?璁″垝锛?/div>
聽聽
鍘熷洜鍒嗘瀽锛?/strong>
聽 鍥犱负ACCOUNT_TRADE琛ㄧ殑瀛楁?YKKH鏄疌HAR锛屽洜姝ゅ湪瀵瑰叾鎸囧畾鐨勫?兼槸鏁板瓧鏃讹紝Oracle铏界劧鑳介殣寮忕殑鎵ц?鏁板瓧鍜屽瓧绗︾殑杞?崲锛屼絾涓嶄細璋冪敤鍏剁储寮曘?傝?屽綋瀵瑰叾鎸囧畾鏄?瓧绗︽椂锛屽垯涓嶅瓨鍦ㄦ?闂??锛岀储寮曞彲浠ヨ皟鐢ㄣ??/div>
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聽
娉ㄦ剰锛氬洜涓烘暟鎹?被鍨嬬殑涓嶅尮閰嶅拰Oracle瀵规暟鎹?被鍨嬬殑闅愬紡杞?崲锛屾?绉嶇被鍨嬬殑浣庢晥浠ｇ爜鍦ㄤ换浣曢」鐩?腑鍧囧彲鑳藉洜涓哄ぇ鎰忚?屽瓨鍦?紝鍥犳?寤鸿?寮?鍙戜汉鍛樺拰绠＄悊浜哄憳瑕佸畾鏈熸娊鏌ョ浉搴旂殑浠ｇ爜锛屼互鏉滅粷姝ょ被浣庢晥浠ｇ爜锛?/div>
聽
绱㈠紩绫诲瀷鎬荤粨
绫诲瀷 | 锛屾弿杩?/strong> |
b-tree绱㈠紩 | 鏈?甯告渶澶氫娇鐢ㄧ殑绱㈠紩锛屽叾鏍戠粨鏋勪笌浜屽弶鏍戞瘮杈冪被浼硷紝鏍规嵁ROWID蹇??熷畾浣嶆墍璁块棶鐨勮? |
bitmap绱㈠紩 | 浣跨敤浣嶅浘鏉ョ?鐞嗕笌鏁版嵁琛岀殑瀵瑰簲鍏崇郴锛岄?傜敤浜庡熀鏁版瘮杈冨皯鐨勫垪 |
闄嶅簭绱㈠紩 | 闄嶅簭绱㈠紩鍦ㄥ彾瀛愯妭鐐逛腑鐨勫瓨鍌ㄤ粠宸﹀埌鍙虫槸鎸夌収浠庡ぇ鍒板皬鎺掑簭鐨勶紱涓?鑸?槸閽堝?閫嗗悜鎺掑簭杈冨?鐨勬煡璇㈡椂鎵嶄娇鐢ㄨ?绫诲瀷绱㈠紩 |
鍑芥暟绱㈠紩 | 閽堝?瑕侀?绻佸?鍒椾娇鐢ㄥ嚱鏁扮殑绱㈠紩锛屽彧鏈夊綋鏌ヨ?璇?彞鍖呭惈璇ュ嚱鏁版垨鑰呰〃杈惧紡鏃讹紝鍩轰簬鍑芥暟鐨勭储寮曟墠浼氳?璋冪敤 |
鍙嶈浆绱㈠紩 | 鍙嶈浆浜哹*tree绱㈠紩鐮佷腑鐨勫瓧鑺傦紝浣跨储寮曟潯鐩?垎閰嶆洿鍧囧寑锛屽?鐢ㄤ簬骞惰?鏈嶅姟鍣ㄧ幆澧冧笅锛岀敤浜庡噺灏戠储寮曠殑绔炰簤 |
鍒嗗尯绱㈠紩 | 鍒嗗尯琛ㄧ殑绱㈠紩锛屽張鍖呮嫭鏈?湴鍒嗗尯绱㈠紩(鏈?湴鍓嶇紑鍒嗗尯绱㈠紩鍜屾湰鍦伴潪鍓嶇紑鍒嗗尯绱㈠紩)鍜屽叏灞?绱㈠紩锛屼竴鑸?缓璁?娇鐢ㄦ湰鍦板垎鍖虹储寮曪紝鍥犲叾涓庡熀琛ㄥ叿鏈夎壇濂界殑鏁版嵁鍧囪 鎬у拰鍙?淮鎶ゆ??/div> |
聽
璁块棶璺?緞
1. 鍏ㄨ〃鎵?弿
聽鍏ㄨ〃鎵?弿锛團ULL TABLE SCANS锛夋椂鎵?鏈夎?銆佹墍鏈夋暟鎹?潡鍧囦細琚??鍒帮紝鏄?span class="Apple-converted-space">聽鏁堢巼鏈?浣?/strong>鐨勪竴绉嶏紝涓?鑸?細鍦ㄨ〃聽缂哄皯绱㈠紩銆?span class="Apple-converted-space">聽璇诲彇澶ч噺鏁版嵁銆?span class="Apple-converted-space">聽璁块棶灏忚〃鎴?span class="Apple-converted-space">聽楂樺苟鍙戞椂鍙戠敓銆?/div>
聽
聽聽2. ROWID鎵?弿
聽聽ROWID鎵?弿锛圧OWID SCANS锛夋槸閫氳繃ROWID涓?暟鎹?枃浠跺拰鍧椾綅缃??闂?暟鎹??銆備竴鑸?綔涓鸿?闂?储寮曞悗鐨勭?浜屾?锛屽?鏋滆?闂?殑鍒楀叏閮ㄥ寘鍚?湪绱㈠紩涓?紝鍒欎笉浼氭墽琛孯OWID鎵?弿銆?/div>
聽
聽聽聽浣滀负绱㈠紩璁块棶鍚庣殑绗?簩姝ワ細
聽聽璁块棶鐨勫垪鍏ㄩ儴鍦ㄧ储寮曚腑涓嶅啀鎵ц?ROWID鎵?弿聽
聽3. 绱㈠紩鎵?弿
聽聽绱㈠紩鎵?弿(INDEX SCANS)鍖呭惈鍏ㄧ储寮曟壂鎻忥紙full index scan銆丗IS锛夈?佸揩閫熷叏绱㈠紩鎵?弿(fast full index scan銆丗FIS)銆佺储寮曡寖鍥存壂鎻?index range scan)銆佺储寮曞敮涓?鎵?弿 (index unique scan)銆佺储寮曡烦璺冨紡鎵?弿 (index skip scan)銆佷綅鍥剧储寮曟壂鎻?bitmap index scan)锛?span class="Apple-converted-space">聽鍏朵腑鍓?绉嶅湪鏈?郴鍒楄?绋嬬殑绱㈠紩绔?/strong>聽鑺傞儴鍒嗗凡缁忚?瑙ｄ簡鍏剁悊璁哄拰绀轰緥銆備綅鍥剧储寮曠ず渚嬪?涓嬶細
聽3. 绱㈠紩鎵?弿
绫诲瀷 | 鏂瑰紡 | 鍙戠敓鏉′欢 |
聽1.FULL INDEX SCANS | 閫愪竴璇诲彇绱㈠紩涓?殑鎵?鏈夊潡锛岀敱浜庣储寮曚腑鏁版嵁宸叉寜绱㈠紩閿?帓搴忥紝鍥犳?浼氬拷鐣ユ帀鎺掑簭 | 1.ORDER BY涓?殑鍒楀叏閮ㄥ湪璇ョ储寮曚腑鏃?span class="Apple-converted-space">聽 2.ORDER BY涓?垪鐨勯『搴忔弧瓒崇储寮曚腑鍓嶅?鍒楃殑椤哄簭鏃?br>3.浣跨敤GROUP BY涓旇?瀛愬彞涓?殑鍒楀湪绱㈠紩涓?椂 |
2.FAST FULL INDEX SCANS | 鍙?壂鎻忕储寮曚腑鐨勬暟鎹?紝涓嶄細鎵?弿琛ㄤ腑鐨勬暟鎹?紱鐢变簬绱㈠紩涓?暟鎹?湭鎸夌储寮曢敭鎺掑簭锛屽洜姝や笉鑳藉拷鐣ユ帀鎺掑簭 | 褰撳悓鏃舵弧瓒充笅鍒楁潯浠舵槸锛孫racle鐢‵FIS鏇夸唬FIS:聽 1.鏌ヨ?鐨勬墍鏈夊垪鍧囧寘鍚?湪绱㈠紩涓?span class="Apple-converted-space">聽 2.绱㈠紩涓?殑鍒楄嚦灏戜竴涓?叿鏈塶ot null绾︽潫 |
3.INDEX RANGE SCANS | 璁块棶閫夋嫨鎬ф暟鎹?渶甯哥敤鐨勬壂鎻忔柟寮忥紱鎸夐『搴忕殑瀵规煇涓?储寮曡繘琛屾壂鎻忥紝杩斿洖鏁版嵁鏄?崌搴忔帓鍒楃殑锛屽彲浠ヤ娇鐢ㄥ敮涓?绱㈠紩鍜岄潪鍞?竴绱㈠紩;濡傛灉瀵圭储寮曞垪浣跨敤ORDER BY/GROUP BY鍒欏彲鐪佺暐鎺掑簭 | 1.鍦ㄥ敮涓?绱㈠紩涓婁娇鐢ㄨ寖鍥存搷浣滅?(>銆?lt;銆?gt;=銆?lt;=銆?lt;>銆丅ETWEEN)聽 2.鍦ㄧ粍鍚堢储寮曚笂浣跨敤閮ㄥ垎鍒楄繘琛屾煡璇?紝瀵艰嚧鏌ュ嚭澶氳? |
4.INDEX UNIQUE SCANS | 鎵?弿鍞?竴绱㈠紩鎴栦富閿?紝瑕佷箞杩斿洖涓?琛屾暟鎹??涔堣繑鍥?琛屾暟鎹?/div> | 1.褰撲娇鐢ㄥ敮涓?绱㈠紩鏃?span class="Apple-converted-space">聽 2.褰撲娇鐢ㄤ富閿?椂 |
5.INDEX SKIP SCANS | 鍏跺疄璐ㄦ槸灏嗙储寮曞垎瑙ｆ垚澶氫釜灏忕殑瀛愮储寮曟潵鎻愰珮鏁堢巼锛岀郴浠?i寮?濮嬪紩鍏?/div> | 澶嶅悎绱㈠紩涓?墠瀵煎垪鐨勫彇鍊兼槸鏋氫妇鐨勪粠鑰屽彲浠ュ垎鎷嗕负澶氫釜瀛愮储寮?骞朵笖鏌ヨ?鏉′欢涓?笉鍚?墠瀵煎垪鏃?/div> |
聽
涓轰簡聽鍔犳繁宸╁浐鍓嶉潰鐨勭煡璇?/strong>锛屾湰澶勫?鍓嶄簲绉嶇储寮曟壂鎻忓?涔犳?荤粨濡備笅锛?/div>
(1).鍏ㄧ储寮曟壂鎻?/div>
閫愪竴璇诲彇绱㈠紩涓?殑鎵?鏈夊潡锛岀敱浜庣储寮曚腑鏁版嵁宸叉寜绱㈠紩閿?帓搴忥紝鍥犳?浼氬拷鐣ユ帀鎺掑簭锛屽彲鑳藉彂鐢熺殑鎯呭喌濡備笅锛?/div>
A. ORDER BY涓?殑鍒楀叏閮ㄥ湪鏌愪釜绱㈠紩涓?/div>
聽聽 鍏ㄩ儴鍦ㄦ煇涓?储寮曚腑锛?/div>
聽
聽(1).鍏ㄧ储寮曟壂鎻?/div>
B. ORDER BY涓?垪鐨勯『搴忔弧瓒崇储寮曚腑鍓嶅?鍒楃殑椤哄簭鏃?/div>
聽 涓嬮潰鍒嗗埆鏄?弧瓒冲拰涓嶆弧瓒冲墠瀵煎垪椤哄簭鏃讹細
C. 浣跨敤GROUP BY涓旇?瀛愬彞涓?殑鍒楀湪绱㈠紩涓?椂
(2).蹇??熷叏绱㈠紩鎵?弿
鍙?壂鎻忕储寮曚腑鐨勬暟鎹?紝涓嶄細鎵?弿琛ㄤ腑鐨勬暟鎹?紱鐢变簬绱㈠紩涓?暟鎹?湭鎸夌储寮曢敭鎺掑簭锛屽洜姝や笉鑳藉拷鐣ユ帀鎺掑簭銆傚綋鍚屾椂婊¤冻涓嬪垪鏉′欢鏃讹紝Oracle鐢‵FIS鏇夸唬FIS鎴朏TS:
1.鏌ヨ?鐨勬墍鏈夊垪鍧囧寘鍚?湪绱㈠紩涓?/div>
2.绱㈠紩涓?殑鍒楄嚦灏戜竴涓?叿鏈塶ot null绾︽潫锛?0g寮?濮嬬殑锛屽師浣庣増鏈?殑绯荤粺涓?负鏌ヨ?鐨勫垪涓?笉鍖呭惈浠讳綍null鍊硷級聽
聽
鍏ㄩ儴鍒楀潎鍦ㄧ储寮曚腑锛?/div>聽聽
聽
聽聽鏈夊垪涓嶅湪绱㈠紩涓?細聽
聽
鍒犻櫎璇ョ储寮曪紝鍒涘缓鏂扮储寮曪紝涓や釜鍒楀潎涓哄彲绌猴細
姝ゆ椂鍗充娇鍏ㄩ儴鍒楀湪璇ョ储寮曚腑锛?/strong>聽聽涔熶笉浼氬彂鐢烣FIS
绱㈠紩鑼冨洿鎵?弿鏄??闂??夋嫨鎬ф暟鎹?渶甯哥敤鐨勬壂鎻忔柟寮忥紱鎸夐『搴忕殑瀵规煇涓?储寮曡繘琛屾壂鎻忥紝杩斿洖鏁版嵁鏄?崌搴忔帓鍒楃殑锛屽彲浠ヤ娇鐢ㄥ敮涓?绱㈠紩鍜岄潪鍞?竴绱㈠紩;濡傛灉瀵圭储寮曞垪浣跨敤ORDER BY/GROUP BY鍒欏彲鐪佺暐鎺掑簭銆?/div>
涓嬪垪鎯呭舰涓?細鍙戠敓绱㈠紩鑼冨洿鎵?弿锛?/div>聽
A.鍦ㄥ敮涓?绱㈠紩涓婁娇鐢ㄨ寖鍥存搷浣滅?(>銆?lt;銆?gt;=銆?lt;=銆?lt;>銆丅ETWEEN)
B.鍦ㄧ粍鍚堢储寮曚笂浣跨敤閮ㄥ垎鍒楄繘琛屾煡璇?紝瀵艰嚧鏌ュ嚭澶氳?
绀轰緥璇峰弬鑰冩湰绯诲垪璇剧▼鐨勭储寮曠珷鑺傞儴鍒?/strong>
聽
(4).绱㈠紩鍞?竴鎵?弿
聽 褰撲娇鐢ㄤ富閿?垨鍞?竴绱㈠紩鏃跺彂鐢熴??span class="Apple-converted-space">聽绀轰緥璇峰弬鑰冩湰绯诲垪璇剧▼鐨勭储寮曠珷鑺傞儴鍒嗐??/strong>
(5).绱㈠紩璺宠穬鎵?弿
聽聽聽 澶嶅悎绱㈠紩涓?墠瀵煎垪鐨勫彇鍊兼槸鏋氫妇鐨勪粠鑰屽彲浠ュ垎鎷嗕负澶氫釜瀛愮储寮?骞朵笖鏌ヨ?鏉′欢涓?笉鍚?墠瀵煎垪鏃躲?傜ず渚嬪?涓嬶細
create table customers as select * from sh.customers;
CREATE INDEX customers_gender_email
聽 ON customers (cust_gender, cust_email);
聽
(5).绱㈠紩璺宠穬鎵?弿
聽娌¤繘琛岃〃鍒嗘瀽鍓嶏細
聽聽
聽杩涜?琛ㄥ垎鍚庯細
聽聽 analyze table customers compute statistics;
聽聽
浣曟椂闇?瑕佺储寮?/strong>
涓?鑸?湴锛屽?浜庝粠琛ㄧ殑鎬昏?涓?殑澶ч儴鍒嗘煡璇㈠彧鏌ヨ?涓嶅埌10%鏁版嵁锛堟湁鐨勭О涓?%-4%锛夌殑琛?紝鍙?互鑰冭檻鍒涘缓绱㈠紩銆備竴鑸??冭檻鐨勭储寮曠殑鍘熷垯鍖呮嫭锛?/div>
聽
l瀵逛簬缁忓父浠ユ煡璇㈠叧閿?瓧涓哄熀纭?鐨勮〃锛屽苟涓旇?琛ㄤ腑鐨勬暟鎹??鏄?潎鍖?鍒嗗竷鐨?/div>
l浠ユ煡璇㈠叧閿?瓧涓哄熀纭?锛岃〃涓?殑鏁版嵁琛岄殢鏈烘帓搴?/div>
l琛ㄤ腑鍖呭惈鐨勫垪鏁扮浉瀵规瘮杈冨皯锛堜粎浠呮槸鐩稿?锛岄渶瑕佹牴鎹?疄闄呮儏鍐电‘瀹?
l琛ㄤ腑鐨勫ぇ澶氭暟鏌ヨ?閮藉寘鍚?浉瀵圭畝鍗曠殑WHERE瀛愬彞
l琛ㄧ殑璁板綍鏁版瘮杈冨皯鐨勶紝涓嶅缓璁?娇鐢ㄧ储寮曪紝濡傛暟鎹?笉瓒呰繃1涓囪?鐨勮〃涓嶈?寤虹珛绱?/div>
聽聽聽
涓虹储寮曢?夋嫨鍒楀拰琛ㄨ揪寮?/strong>
涓?鑸?伒寰?殑鍘熷垯鍖呮嫭锛?/div>
聽聽
l缁忓父鍦╓HERE瀛愬彞涓?娇鐢ㄧ殑鍒?/div>
聽lSQL璇?彞涓?粡甯哥敤浜庤〃涔嬮棿杩炴帴鐨勫垪
l閲嶅?鎬у皯锛堝彲閫夋嫨鎬ч珮锛夌殑鍏抽敭瀛楋紝濡備富閿?/div>
聽聽
l涓嶅疁灏嗙粡甯窾PDATE鐨勫垪浣滀负绱㈠紩鍒?/div>
l涓嶅疁灏嗙粡甯稿湪WHERE瀛愬彞涓?娇鐢?紝浣嗕笌鍑芥暟鎴栨搷浣滅?鐩哥粨鍚堢殑鍒椾綔涓虹储寮曞垪
l瀵逛簬鍙栧?艰緝灏戠殑鍒楋紝搴旇?冭檻寤虹珛浣嶅浘绱㈠紩锛岃?屼笉搴旇?閲囩敤B鏍戠储寮?/div>
l濡傛灉缁忓父璁块棶鐨勫垪涓婅?浣跨敤鍑芥暟锛屽簲浣跨敤鍩轰簬鍑芥暟鐨勭储寮?/div>
聽
鏈??涓句緥璇存槑鍙栧?艰緝灏戠殑鍒椾娇鐢╞itmap绱㈠紩鍜宐-tree鐨勫?姣斿垎鏋愶紝B-tree鏃讹細
聽bitmap鏃讹細
聽
浣跨敤澶嶅悎绱㈠紩
聽聽澶氫釜鍒楄仈鍚堣捣鏉ョ粍鎴愮殑绱㈠紩绉颁负澶嶅悎绱㈠紩銆佹垨鑱斿悎绱㈠紩鎴栬?呯粍鍚堢储寮曪紝寰?寰?鑱斿悎绱㈠紩姣斿崟涓?储寮曞叿鏈夋洿濂界殑鎬ц兘銆傚垱寤鸿仈鍚堢储寮曚竴鑸?伒寰?殑鍘熷垯鍖呮嫭锛?/div>聽
l缁忓父鍦╓HERE瀛愬彞涓?娇鐢ㄧ殑鍒椾笖杩欎簺鍒椾箣闂翠娇鐢ˋND杩炴帴
l鏌ヨ?鏉′欢鍙?兘鍖呮嫭n涓?垪鐨凙ND鍏崇郴锛岃?屽ぇ澶氭暟鎯呭喌涓嬩娇鐢╩涓?垪鏄?n>m)锛屽簲璇ヨ?冭檻澶嶅悎绱㈠紩锛屼笖n涓?垪涓哄墠瀵煎垪
l鏌愬嚑涓?垪鑱斿悎璧锋潵鑳藉?缁勬垚鍞?竴绱㈠紩锛屽簲鍧氬喅寤虹珛鑱斿悎鍞?竴绱㈠紩
l澶嶅悎绱㈠紩涓?紝寤鸿?鑷冲皯涓?涓?笉鑳戒负null锛屼笖濡傛灉鍙?兘灏介噺灏嗗彧鏄?瓨鍦╪ull鐨勫垪瀵瑰叾null鍊奸噰鐢ㄥ叾瀹冮粯璁ゅ?间唬鏇?/div>
聽
鏈??涓句緥璇存槑Where涓?寘鍚獳ND鏃朵娇鐢ㄥ?涓?储寮曟?ц兘浣庝簬鑱斿悎绱㈠紩鐨勭ず渚嬶紝浣跨敤澶氫釜绱㈠紩鏃讹細
聽聽
聽
鏈??涓句緥璇存槑Where涓?寘鍚獳ND鏄?娇鐢ㄥ?涓?储寮曟?ц兘浣庝簬鑱斿悎绱㈠紩鐨勭ず渚嬶紝浣跨敤澶嶅悎绱㈠紩鏃讹細
聽缁撹?锛?/div>
椤圭洰 | 澶氫釜绱㈠紩 | 澶嶅悎绱㈠紩 | 澶嶅悎绱㈠紩鏄??涓?储寮曠殑 |
涓?銆佹墽琛屾椂闂?/div> | 0.281 | 0.11 | 39.15% |
浜屻?佹墽琛岃?鍒?/div> | 聽 | 聽 | 聽 |
1.鎬昏?楄垂 | 1658 | 464 | 27.99% |
2.I/O鑰楄垂 | 1562 | 462 | 29.58% |
3.鏃堕棿 | 19 | 6 | 31.58% |
鍙??锛屾?鏃跺?鍚堢储寮曟槸澶氫釜绱㈠紩鐨勬晥鐜囩殑聽鍥涘?嶄互涓婏紒
鐩戣?绱㈠紩鐨勪娇鐢ㄦ儏鍐?/strong>
u姝ｇ‘鍚堥?傜殑绱㈠紩鏄?煡璇?紭鍖栨?ц兘鐨勯?閫?/div>
u绱㈠紩鏄?〃鐨勭储寮曞垪鎺掑簭鍚庣殑灏忓瀷鍖栨嫹璐濓紝浼氬?鍔犲瓨鍌ㄥ紑閿?锛屽洜姝や細甯︽潵Insert銆乁pdate銆丏elete鐨勯?澶栧紑閿?
u涓?涓?〃鍙?互鏈変竴涓?储寮曪紝涔熷彲浠ユ湁澶氫釜绱㈠紩锛屽線寰?杩囧?鐨勭储寮曟垨涓嶆伆褰撶殑绱㈠紩甯︽潵鐨勮礋闈㈡?ц兘鏇村?
u琛ㄧ储寮曠殑璁捐?鍒濊》锛屽線寰?鍦?0%鐢氳嚦鏇撮珮鐨勬儏鍐典笅涓庢渶缁堢殑瀹為檯浣跨敤鎯呭喌涓嶇?鍚堬紝姝や妇瑙嗚?璁′汉鍛樺?涓氬姟鍜孫racle鐨勭悊瑙ｄ笉鍚岃?屼笉鍚?/div>
聽
u鐩戣?绱㈠紩鐨勫疄闄呬娇鐢ㄦ儏鍐碉紝灏ゅ叾鍦ㄨ〃鍏锋湁澶氫釜绱㈠紩鐨勬儏鍐典笅锛屽氨鏄惧緱灏や负閲嶈?锛屽?缁忓父涓嶄娇鐢ㄧ殑绱㈠紩閲囩敤鍚堝苟涓哄?鍚堢储寮曟垨鍒犻櫎鏄?紭鍖栫殑宸ヤ綔涔嬩竴
绀轰緥濡備笅锛?/div>
1.鍒涘缓绱㈠紩
聽聽
2.鍚?敤鎵?浠ョ洃瑙?/div>
聽聽
3.鎵ц?SQL
聽聽
聽
聽
4.鏌ョ湅绱㈠紩浣跨敤鎯呭喌
聽鎴戜滑鍙?互鏍规嵁涓?涓?寔缁?椂闂寸殑瀵圭储寮曠殑鐩戞帶缁撴灉鍐冲畾濡備綍鍚堝苟鍙婂垹闄や笉鎭板綋鐨勭储寮曘??/div>
聽聽杞?浇璇锋敞鏄庣?濉惧湪绾裤??span class="Apple-converted-space">聽http://sishuok.com/forum/blogPost/list/6414.html銆?/div>
5.鍋滄?鐩戣?绱㈠紩
聽 1 妤? x734545751k 20 灏忔椂鍓?nbsp;
瀛︿範瀛︿範瀛︿範
2 妤? 942bc 19 灏忔椂鍓?nbsp;
瑙嗛?鏀惰垂鍟?/div>
3 妤? string2020 18 灏忔椂鍓?nbsp;
濂借创锛岀?妤间富鏃╁綋澶у畼锛屾棭鏃ュǘ婕備寒濯冲?銆?/div>
4 妤? nishwd123 17 灏忔椂鍓?nbsp;
姒傛嫭寰堢粏锛屾ゼ涓昏緵鑻︿簡锛岃阿璋㈠垎浜???/div>
5 妤? xiaokang1582830 17 灏忔椂鍓?nbsp;
鎵撳箍鍛妜xxxx
6 妤? jyjava 14 灏忔椂鍓?nbsp;
kengdie,浣犲氨涓嶈兘鐩存帴涓嬭浇涓婁紶鍒癷teye鍟?/div>
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