1 SET STATISTICS IO 查詢(xún)SQL語(yǔ)句的讀寫(xiě)代價(jià). 可以用來(lái)查看sql語(yǔ)句的讀和寫(xiě)的操作的代價(jià),對(duì)完成同樣功能的兩個(gè)sql語(yǔ)句比較讀寫(xiě)代價(jià)就能進(jìn)行效率的初步比較奧. SET STATISTICS IO ON GO SELECT COUNT(*) FROM NORTHWIND..EMPLOYEES GO SET STATISTICS IO OFF GO 2通過(guò)執(zhí)行系統(tǒng)存儲(chǔ)過(guò)程SP_SPACEUSED可以查看表的物理空間 EXEC SP_SPACEUSED EMPLOYEES 3 SET STATISTICS TIME 查詢(xún)SQL語(yǔ)句的執(zhí)行時(shí)間 SET STATISTICS TIME ON GO SELECT COUNT(*) FROM NORTHWIND..EMPLOYEES GO SET STATISTICS TIME OFF GO 4 SET SHOWPLAN_TEXT ON 查詢(xún)sql語(yǔ)句的執(zhí)行計(jì)劃 SET SHOWPLAN_TEXT ON GO SELECT COUNT(*) FROM NORTHWIND..EMPLOYEES GO SET SHOWPLAN)TEXT OFF GO 5 SET NOCOUNT ON 減少sql語(yǔ)句的網(wǎng)絡(luò)流量 SET NOCOUNT ON GO SELECT COUNT(*) FROM NORTHWIND..EMPLOYEES GO SET NOCOUNT OFF GO

轉(zhuǎn)載于:https://www.cnblogs.com/acoll/archive/2012/04/06/2434063.html

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