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MySQL shu ju ku suo yin cha xun you hua de fen xiang

2008-12-22 08:07:51 编辑來源:互联网 评论
 
 
 
本文为【MySQL数据库索引查询优化的分享】的拼音翻译版
  wen ti miao shu :
  wo men yao fang wen de biao shi yi ge fei chang da de biao , si qian wan tiao ji lu ,id shi zhu jian ,program_id shang jian le suo yin 。
  zhi xing yi tiao SQL:
  select * from program_access_log where program_id between 1 and 4000
  zhe tiao SQL fei chang man 。
  wo men yuan yi wei chu li ji lu tai duo de yuan yin , suo yi jia le id xian zhi , yi ci zhi du wu shi wan tiao ji lu
  select * from program_access_log where id between 1 and 500000 and program_id between 1 and 4000
  dan shi zhe tiao SQL reng ran hen man , su du bi shang mian yi tiao ji hu mei you ti sheng 。
  Mysql chu li 50 wan tiao ji lu de biao , tiao jian zi duan huan jian le suo yin , zhe tiao yu ju ying gai shi shun jian wan cheng de 。
  wen ti fen xi :
  zhe zhang biao da yue rong liang 30G, shu ju ku fu wu qi nei cun 16G, wu fa yi ci zai ru 。 jiu shi zhe ge zao cheng le wen ti 。
  zhe tiao SQL you liang ge tiao jian ,ID yi dao wu shi wan he Program_id yi dao si qian , yin wei program_id fan wei xiao de duo ,mysql xuan ze ta zuo wei zhu yao suo yin 。
  xian tong guo suo yin wen jian zhao chu le suo you program_id zai 1 dao 4000 fan wei li suo you de id, zhe ge guo cheng fei chang kuai 。
  jie xia lai yao tong guo zhe xie id zhao chu biao li de ji lu , you yu zhe xie id shi li san de , suo yi mysql dui zhe ge biao de fang wen bu shi shun xu du qu 。
  er zhe ge biao you fei chang da , wu fa yi ci zhuang ru nei cun , suo yi mei fang wen yi tiao ji lu mysql dou yao chong xin zai ci pan shang ding wei bing ba fu jin de ji lu dou zai ru nei cun , da liang de IO cao zuo dao zhi le su du de xia jiang 。
  wen ti jie jue fang an :
  1. yi program_id wei tiao jian dui biao jin xing fen qu
  2. fen biao chu li , mei zhang biao de da xiao bu chao guo nei cun de da xiao
  ran er , fu wu qi yong de shi mysql5.0, bu zhi chi fen qu , er qie zhe ge biao shi gong gong biao , wu fa zai bu ying xiang qi ta xiang mu de tiao jian xia xiu gai biao de jie gou 。
  suo yi wo men cai qu le di san zhong ban fa :
  select * from program_access_log where id between 1 and 500000 and program_id between 1 and 15000000
  xian zai program_id de fan wei yuan da yu id de fan wei ,id bei dang zuo zhu yao suo yin jin xing cha zhao , you yu id shi zhu jian , suo yi cha zhao de shi lian xu 50 wan tiao ji lu , su du he fang wen yi ge 50 wan tiao ji lu de biao ji ben yi yang
  zong jie :
  zhe shi yi ge zai qian wan bi ji lu biao zhong you yu shi yong le suo yin dao zhi le shu ju cha zhao bian man de wen ti , you yi ding de dian xing xing he da jia jiao liu xia !【原文】【汉音对照
 
 
 
 
 
 
 
 
 
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wen ti miao shu : wo men yao fang wen de biao shi yi ge fei chang da de biao , si qian wan tiao ji lu ,id shi zhu jian ,program_id shang jian le suo yin 。 zhi xing yi tiao SQL: select * from program_access_log where program_id between 1 and 4000 zhe tiao SQL fei chang man 。 wo men yuan yi wei chu li ji lu tai duo de yuan yin , suo yi jia le id xian zhi , yi ci zhi du wu shi wan tiao ji lu select * from program_access_log where id between 1 and 500000 and program_id between 1 and 4000 dan shi zhe tiao SQL reng ran hen man , su du bi shang mian yi tiao ji hu mei you ti sheng 。 Mysql chu li 50 wan tiao ji lu de biao , tiao jian zi duan huan jian le suo yin , zhe tiao yu ju ying gai shi shun jian wan cheng de 。 wen ti fen xi : zhe zhang biao da yue rong liang 30G, shu ju ku fu wu qi nei cun 16G, wu fa yi ci zai ru 。 jiu shi zhe ge zao cheng le wen ti 。 zhe tiao SQL you liang ge tiao jian ,ID yi dao wu shi wan he Program_id yi dao si qian , yin wei program_id fan wei xiao de duo ,mysql xuan ze ta zuo wei zhu yao suo yin 。 xian tong guo suo yin wen jian zhao chu le suo you program_id zai 1 dao 4000 fan wei li suo you de id, zhe ge guo cheng fei chang kuai 。 jie xia lai yao tong guo zhe xie id zhao chu biao li de ji lu , you yu zhe xie id shi li san de , suo yi mysql dui zhe ge biao de fang wen bu shi shun xu du qu 。 er zhe ge biao you fei chang da , wu fa yi ci zhuang ru nei cun , suo yi mei fang wen yi tiao ji lu mysql dou yao chong xin zai ci pan shang ding wei bing ba fu jin de ji lu dou zai ru nei cun , da liang de IO cao zuo dao zhi le su du de xia jiang 。 wen ti jie jue fang an : 1. yi program_id wei tiao jian dui biao jin xing fen qu 2. fen biao chu li , mei zhang biao de da xiao bu chao guo nei cun de da xiao ran er , fu wu qi yong de shi mysql5.0, bu zhi chi fen qu , er qie zhe ge biao shi gong gong biao , wu fa zai bu ying xiang qi ta xiang mu de tiao jian xia xiu gai biao de jie gou 。 suo yi wo men cai qu le di san zhong ban fa : select * from program_access_log where id between 1 and 500000 and program_id between 1 and 15000000 xian zai program_id de fan wei yuan da yu id de fan wei ,id bei dang zuo zhu yao suo yin jin xing cha zhao , you yu id shi zhu jian , suo yi cha zhao de shi lian xu 50 wan tiao ji lu , su du he fang wen yi ge 50 wan tiao ji lu de biao ji ben yi yang zong jie : zhe shi yi ge zai qian wan bi ji lu biao zhong you yu shi yong le suo yin dao zhi le shu ju cha zhao bian man de wen ti , you yi ding de dian xing xing he da jia jiao liu xia !
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