SQL Server????????????????
???????????? ???????[ 2013/3/28 11:30:03 ] ????????
????MySQL
????MySQL MYISAM?洢?????????洢???????????????
????MySQL INNODB?洢??????????????????????????????????????????????檔
????Oracle
????Oracle??????洢????????????????????????????洢??Oracle??????????????????洢??????д??Cluster??????????????????????????????????????????洢????????У??????????????洢?????????Щ???????綩?????????????????????????????ξ????洢???????????У??????????????????????????????????????????????鼴???????÷?Cluster???????????????????OK??
???????VIEW INDEX???????????
???????????????????о???????壬????????????????????????????洢?????????????????????
????SQLServer
?????????????????????????????????????????????????Ψ?????????????????????????????????????μ????????????????????????
?????????????????????????????????????????
????1????????????????????
?????羭?????select sum??amount?? from t2???????????????????????????t??????仯??????????????????????????????with schemabinding?????
CREATE VIEW V2
with schemabinding
AS
SELECT SUM(amount) as sum_amount??COUNT_BIG (*) as cnt
FROM t2
????????????????????????????????????????
CREATE UNIQUE CLUSTERED INDEX idx_4 ON V2 (sum_amount)
?????????????noexpand??????v2????????????£?
SELECT sum_amount FROM v2 WITH(NOEXPAND)
???????????????????????????????????????????????????t2??????????
????2???????????????洢
????????????????????????????????洢??????????????????????????????????д????Щ??????????????罻????????????????????????????????????????????????????????????????????ú????????????????????????????????????????????????ó??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
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????MySQL???????
????Oracle???????????????????????????????????????????????????????
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