Mysql Explain??????????????
?????WhyWin ???????[ 2016/9/13 10:50:41 ] ????????????? MySQL
????eq_reg:mysql????????????:"??????????????????????????????ж????С???????????????????????const???????????????????????в??????????ò?????????UNIQUE??PRIMARY KEY"??eq_ref???????????=???????????С?
????ref:ref ??????????????????????????????????????????н?????????ж??????????????ü??????????????????????UNIQUE??PRIMARY KEY?????仰??????????????????????????е???????????ref??????????????????????У??????????????????
????range:??????Χ????????????????????????С?
????index :????????????ALL??????????????????????衣???????ALL????????????????????????С???????????all??Index???????????index????????ж???????all???????ж????
????ALL ???????????????????????????????????????衣???????????????const?????????????????????????????o????????????????????????????ALL??????????????????е????????????????????
????possible_keys????????????????????е????????????????п??????????????????????where???????????????????
????key?? ?????????????????null?????????????????????????£?mysql???????????????????????????£???????select????????use index??indexname???????????????????????ignore index??indexname???????mysql????????
????key_len????????????????????????????????£???????????
????ref???????????????б???????????????????????????
????rows??mysql????????????????????????????????????????????????????ú?????
????extra??????mysql??ν????????????????using temporary??using filesort????????????mysql??????????????????????????????
????extra?з??????????????
????distinct:???mysql????????????????????У???????????
????not exists: mysql?????left join???????????????left join??????У???????????
????range checked for each record??index map:#??:????????????????????????????????????????????mysql???????????????????????????з????С????????????????????????
????using filesort: ????????????????????????mysql??????ж???????????????ζ?????????????????????????????洢?????????????????????е?????????????????
????using index: ??????????????????????е????????ж???????ж????????????????????????????ж????????????????????
????using temporary ????????????????????????????mysql??????????????????洢??????????????????????м?????order by?????????group by??
????where used ?????where???????????Щ?н?????????????????????????????????????е?????У?????????????all??index?????????????????????????????????????????Ч????????????
????system ???????У?system???????const????????????????
????const:???е?????????????????????????????????????????Ω?????????????????У??????????????????mysql??????????????????????????
????eq_ref:???????У?mysql???????????????У?????????????????????ж????????????????????????????????Ω????????????
????ref:??????????????????????????Ω??????????????????Щ????????????磬?????????????????????????????????????????????????????ж???????????????????????????????????????—??????
????range:???????????????????????????Χ?е??У????????>??<?????????????????
????index: ??????????????????е????????????????????裨??all???????????????С????????
????all:?????????????????????????????????????裬????????????t???????
???????????????????????漰???????????????????SPASVOС??(021-61079698-8054)?????????????????????????
??????
???mysql?????????????mysql????? distinct?÷?MySQL?н???????????з??Mysql?????????MySQL Cluster??δ????????????????ν?MySQL??????????300???????MySQL???Uber???????????????????MySql SQL??????????MySQL?????????????????λЧ?????SQL???Java???????:?????MySQL???????linux?°??mysql????MySQL ???????????????????binlog??MySQL????????????Щ??????MySQL???????Mysql???????JDBC?????mysql?????
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?????????App Bug???????????????????????Jmeter?????????QC??????APP????????????????app?????е????????jenkins+testng+ant+webdriver??????????????JMeter????HTTP???????Selenium 2.0 WebDriver ??????