[单选]

A customer needs to ensure that the number of threads servicing an application does not exceed the number of database connections available to the application.
What step must you take to address this situation?（）

诗句“告诉你吧，世界/我－不－相－信！”出自诗歌（） 《生命幻想曲》。 《回答》。 《小巷》。 《纪念碑》。 影响教师社会地位的因素包括（）。 国家与政府的教育、教师政策。 教师队伍的规模。 教师队伍中的性别比例。 教师的从业资格要求。 You administer an online transaction processing (OLTP) system whose database is stored in Automatic Storage Management (ASM) and whose disk group use normal redundancy. One of the ASM disks goes offline, and is then dropped because it was not brought online before DISK_REPAIR_TIME elapsed. When the disk is replaced and added back to the disk group, the ensuing rebalance operation is too slow. Which two recommendations should you make to speed up the rebalance operation if this type of failure happens again?（） Increase the value of the ASM_POWER_LIMIT parameter.。 Set the DISK_REPAIR_TIME disk attribute to a lower value.。 Specify the statement that adds the disk back to the disk group.。 Increase the number of ASMB processes.。 Increase the number of DBWR_IO_SLAVES in the ASM instance.。 You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（）  The time when the last flashback operation in your database was performed.。  The time when the first flashback operation in your database was performed.。  A list of flashback operations performed in your database using SCN and time.。  The approximate time and the lowest system change number （SCN） to which you can flash back your database.。 滑动轴承必须润滑，而滚动轴承由于磨损阻力小就不需要润滑。

A customer needs to ensure that the number of threads servicing an application does not exceed the number of database connections available to the application.
What step must you take to address this situation?（）