[单选]

In a recent Automatic Workload Repository (AWR) report for your database, you notice a high number of buffer busy waits. The database consists of locally managed tablespaces with free list managed segments.
On further investigation, you find that buffer busy waits is caused by contention on data blocks.
Which option would you consider first to decrease the wait event immediately?（）

20世纪60年代以来，心理学家关于儿童游戏的智力发展作用的实证研究表明，游戏与以下哪些因素存在着相关？（） 创造性。 发散性思维。 健康。 问题解决。 审美。 对于各种助行器的选择，下列哪项描述不妥：（） 手杖：上臂自然下垂，屈肘45°掌心到地面的垂直距离。 腋杖：小趾前外侧15cm，到腋窝的距离，屈肘45°，腕前处为把手位置。 轮椅：宽度为患者臀侧与轮椅座位内侧面的距离为2.5cm。 上半身功能好者，轮椅靠背上缘高度应患者腋下10cm。 轮椅座垫与脚踏板之间的距离以患者坐好后，双脚放在脚踏板上，腘窝处大腿前端底部约有4cm不接触座垫。 You executed the following command in Recovery Manager （RMAN） against your Oracle 10g database：RMAN> REPORT NEED BACKUP days 3；What would be the output of this command？（）  a list of files that require a backup within three days。  a list of files that have not been backed up for three days。  a list of files that RMAN recommends be backed up only once in every three days， based on low volatility。  a list of files for which a backup has already been performed and may need a backup after three day。 西周分封制和井田制的纽带是（）。 王位与权力。 土地和义务。 贡赋和工具。 工具和奴隶。 滚动摩擦

In a recent Automatic Workload Repository (AWR) report for your database, you notice a high number of buffer busy waits. The database consists of locally managed tablespaces with free list managed segments.
On further investigation, you find that buffer busy waits is caused by contention on data blocks.
Which option would you consider first to decrease the wait event immediately?（）