UGG Boot????

[werew301459]

??????????????shared pool???????????????????
??????soft prase??????hard prase?????????Oracle?sql?????,UGG Boot???????sql????Oracle???????????Oracle??sql?????????????
1??????syntax check?
???sql????????
2??????semantic check?
????sql??????????????????????????
3??sql???????prase?
???????sql???????????parse tree???????execution plan?,Beats By Dre Pro?
4???sql??????execute and return?
???????????????????
Oracle?????hash??????sql?hash值????library cache????????hash值?
????????sql?cache???????
??“??”?????????????????????????????????????????
????????2???????????????????????????????????????????????
??????????????sql???????????????????????????????????
????????????????????????????????????????????????????????
/****************************************************/
??????????Sql????Bind Var????????????????????????????
???Bind Var???????????????????????????Hard Parse????????????????CPU???
???Client????Sql?Oracle??Oracle ??????????Parse????????????????Optimiser?????????Oracle??????Query Plan,Monster Beats Solo???????????Plan?????Sql???????????????????????????
????Oracle?? Client???Sql?????????Shared Pool?????????????????????????Sql?????Sql?????????????????????????????????????????????????????????????????Sql?????????????????????????????????????CPU???????OLTP??????????Sql?????????????????Sql?????????????????????????????????
?????????Hard Parse?????Hard Parse???????
Parse???????
1?Hard Parse ?????
2?Soft Parse ?????
3?Soft Soft Parse???????????????????
Hard Parse???????????Sql?????????????Shared Pool????????????????????5??????
1?????
2????????
3????????????????????????—?????????4?5???Sql????soft parse?
4???????
5???????
Soft Parse?????Shared Pool???????????Sql??????????Hard Parse??????????
Soft Soft Parse????????session_cursor_cache???????Cursor???Cache???Session?PGA????????????????????????????????PGA??????????????Cursor,Coach Outlet Shop???????????,Moncler Jacken???????? Soft Soft Parse.
????????????????Hard Parse?Soft Parse????Soft Soft Parse??????????Parse ??Soft Parse??????Round?100*?1-?hprs/?prse??2? [hprs???????prse?????] Parse????? Round?100*?1-prse/exec? ?2? [exec?????]
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