教育对人口结构的影响，主要表现为（） 改变人口的性别结构。 提高城镇人口的比重。 改变人口的文化结构。 改变人口的年龄结构。 改变各类职业人口比例，使产业从业人员比例趋向合理。
自治力
While tuning a SQL statement, the SQL Tuning Advisor finds an existing SQL profile for the statement that has stale statistics available. What would the optimizer do in this situation?（） It updates the existing SQL profiles with current statistics。 It makes the statistics information available to GATHER_STATS_JOB。 It initiates the statistics collection process by running GATHER_STATS_JOB。 It logs a warning message in the alert log so that the DBA can perform statistics collection manually。
A data file became corrupted in your database due to bad sectors on the disk. Because of corruption， you lost all the important tables in that data file. Which method would you use for recovery？（） flash back all the tables in the data file， one by one。 restore the data file to a new location and perform a media recovery。 flash back the database; there is no need to restore the data file。 restore the data file from the most recent backup and flash back the database。
真空预压法的施工设备有（），吸水管、密封膜与出膜装置，帷幕墙施工机械等构成。 抽真空装置。 压实设备。 插桩机。 搅拌机。
Which of the following is the default access control list file for the Resource Management and Control （RMC） subsystem？（）
