SQL Server??????o?????????????????
???????????? ???????[ 2013/3/20 10:31:44 ] ????????
??????????????????SQLServer??????????????????????????屑???胁??????????????????????????谓??????????????校????????????????????貌?????????????????????????????????????????屑????SQLServer??????屑??????????????????
?????? ??????????????鈥�??????????????????????????
?????? ??????????AUTO_CREATE_STATISTICS???????ON??SQLServer???????????????????????????????????????????????
????AUTO_CREATE_STATISTICS???
???????????????ON????????????????谓??????????校??????些?械???????????????????????写?????????????些???????????????????????????????????????些???????????胁????????????????????????????????ID?????????????_WA_Sys_<column_name>_<XXXX>????些???????????????????????煤???????????屑????
????????????????????????????????????????
ALTER DATABASE[??????]
SET AUTO_CREATE_STATISTICS ON
????Auto Update Statistics???
?????????????????????????谢?????屑???????椤�????????????锟�?????????????????
????1???????????????????????
????2???????????????????????????500?????锟�?????????????械??????械???????????500.
????3?????????????????????????500?校???????????????泻??????????????500+??????????20%???
????4????Tempdb?械???????6????????6?斜??????
??????????????????????????????????????
ALTER DATABASE[??????]
SET AUTO_UPDATE_STATISTICS ON
????????????????????????????????????????????????????????????????ON????懈???????????????????????????????屑?????????????????????????????????????????????????????
??????????????????????????????????
ALTER DATABASE[??????]
SET AUTO_UPDATE_STATISTICS_ASYNC ON
????????????????????????????????????尾?????????1??????????????????????????OFF?????????????????????????1???????????????????OLTP?????o???????????????????懈??????
??????喂??SQLServer??????????????????
?????????????????锟�????貌????????????????????????????路??????
????1?????sp_autostats??????????????????????????????????????????????睢�
????2?????????校????????NORECOMPUTEoption of the UPDATE STATISTICS???睢�
????3???????????CREATESTATISTICS?????????NORECOMPUTE???????????????????????????
????4????CREATE INDEX?????????STATISTICS_NORECOMPUTE??
????5?????????????????????????????????
ALTER DATABASE[??????]
SET AUTO_UPDATE_STATISTICS OFF
????????????????????????????????????????????y?????效??
???????????????????
????????????????????????????????????DTA??????榇�??????????????????????屑?????????????????????妫╩issing statistics warnings?????????????????????
???????????SQLServer Profiler ????????????????????????????????????????????????谓???邪????????械???些???????????????
??????????????????????锟�?
--Create statistics on all rows
CREATE STATISTICSstatistics_name ONYourDBName.YourSchema.YourTable(YourColumn1??YourColumn2)
WITH FULLSCAN
--Create statistics using a random 10 percent sampling rate
CREATE STATISTICSstatistics_name ONYourDBName.YourSchema.YourTable(YourColumn1??YourColumn2)
WITH SAMPLE 10PERCENT
???????????????????
??????????????械煤???????????????????????????????榈�??????????????????????????????????????????????????????锟�????????????????????2????????????????????????????????????????????????????????????????????????????????????????????????
???????????????????????????????????????????????????????????????????校??????????????????????????????????????????sp_updatestats?娲�??????????
??????

???路???
??????????????????
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