??????2013??校?斜?????????
???????????? ???????[ 2013/10/28 10:07:54 ] ????????????
????10??12?????????
????JAVA???????????????????????????????????????????hashmap??hashtable????????HashMap??ConcurrentHashMap??????
??????????????hashmap??hashtable?????????????13???????????????????榧�??
????stat??SDE??PM??DS??????位????????
????1???????????????????ID????纬??????4????????
????????????????????????????????????relationship(????????100???围???????1小?????)??
????2???????????????????????些??????????
????3??????卸?????TB???????????????????????
????4???????C???SQL??join?????
????5?????????????????????????????????
????6??coding?????????????小?
??????????慰???http://mp.weixin.qq.com/mp/appmsg/show?__biz=MjM5ODIzNDQ3Mw==&appmsgid=10000300&itemidx=1&sign=173a62e0db86cb4c76a0bb1e9c22f3e5??
????10??12???????????????
????1??????卸??????????谢?
????2??????卸???????????????????
????3??101??????????????????????????????????????危??卸??????????????
???????????????????????????????????????http://blog.csdn.net/cqsctlsss/article/details/12747631??
????10??13???????????
????1?? ????????A={a_0??a_1??a_2??...??a_n}(n?????)??????????????????
????2?? ????A??????????????????小???1?????????????????A?????????t?????t??????A?械?位?谩?
????3?? ????????????(????)???????????????????????????慰???????????????
????4?????????????????????????????????????????????????????????????????????危????????????????????????????????????????????????????????懈?????????????????????
????????1???????????????n?????????????????????????
????????2??????????????????????????????????????????????
?????????????渭???http://blog.csdn.net/xyanghomepage/article/details/12687771??
?????????????????
????1????100W????????????小?????50???????效???????top10????????????????貌?????1MB??
????????????????caopengcs??????贸??????路???
?????????100W???????hash???小?????????????100W*50B = 50*10^6B = 50M??????????1M??????????hash???? % 50??????50??小???;
?????????????小???????????hashmap(key??value)??????key??value???????????????????小?????value???????top 10;
??????????味????小?????top 10?榘�????????top 10??
????????????????????锟�?????????????hash?????路????????????械?小??????????1M??????????????????????????????围????50~500??????小?????????????????????????????????????????????????????????????????????????路????????????伞?OK??????????????渭??????http://blog.csdn.net/v_july_v/article/details/7382693??
??????

???路???
??????????????????
2023/3/23 14:23:39???写?貌??????????
2023/3/22 16:17:39????????????????????些??
2022/6/14 16:14:27??????????????????????????
2021/10/18 15:37:44???????????????
2021/9/17 15:19:29???路???????路
2021/9/14 15:42:25?????????????
2021/5/28 17:25:47??????APP??????????
2021/5/8 17:01:11