寫在前頭:
本文是參考李興華老師的十天精通Oracle數據庫所作出的筆記http://study.163.com/course/courseMain.htm?courseId=1543006
背景:生產上對報表查詢突然變慢,經過分析發現同事關聯了一張750W的日誌表 分析: ①:執行順序: 根據Operation縮進來判斷,縮進最多的最先執行;(縮進相同時,最上面的最先執行) ②:對圖中動作的一些說明: 1. 上圖中 TA
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