Examine the command： SQL> DBMS_STATS.SET_TABLE_PREFS（’SH’， ’CUSTOMERS’， ’PUBLISH’， ’false’）； Which statement describes the effect of the above command（） Automatic statistics collection is stopped for the CUSTOMERS table.。 Statistics for the CUSTOMERS table are locked and cannot be overwritten.。 Existing statistics for the CUSTOMERS table become unusable for the query optimizer.。 Subsequently， statistics gathered on the CUSTOMERS table are stored as pending statistics.。
有关抗阻练习的描述中，下列哪一项是错误的（） 训练时不要憋气，收缩时呼气。 骨质疏松症患者是抗阻练习的禁忌证。 若施与受训练肌肉的阻力过大，会出现替代运动。 为避兔抗阻练习的疲劳，练习中应有一定的间歇。 抗阻运动肌肉疼痛可在训练后即刻或训练后24～48小时出现。
知青题材反思小说基本上有两个反思角度，请举例分析其各自特点。
有效竞争理论是由（）提出 克拉克。 爱德华·H.张伯伦。 乔安·罗宾逊夫人。 霍夫曼。
Identify three scenarios in which you would recommend the use of SQL Performance Analyzer to analyzeimpact on the performance of SQL statements.（） Change in the Oracle Database version。 Change in your network infrastructure。 Change in the hardware configuration of the database server。 Migration of database storage from non-ASM to ASM storage。 Database and operating system upgrade。
In one of your online transaction processing （OLTP） applications， most users frequently modify the values， including the key values， of the application tables. Some users generate application reports by using multiple application tables. What is the best table structure that you can use to gain optimal performance？（）
