Oracle（）开始，回滚段只存在于SYSTEM表空间中。

A . 当客户端和服务器通讯协议不能达成一致时 B . 在多层架构中需要拒绝代理请求时 C . 当提交的事务不能被参与的服务器和客户端完全执行时 D . 当会话的所有人不能得到确认和被提交时

A . set savepoint B . set rollback C . set transaction D . set commit

A . 回滚段由一定数量的回滚数据块组成，这些块的结构同一般的数据块一样 B . 回滚段的管理同一般数据文件一样 C . 回滚数据块的分配、淘汰和释放是由数据缓冲区完成的 D . 所有的回滚段组成一个回滚日志文件

A . 正确 B . 错误

A . as a flat file B . as a BPEL-compiled definition C . as an XML file with an associated document type definition (DTD) D . as an XML file without an associated document type definition (DTD)

A . A.没有口令 B . B.CHANGE_ON_INSTALL，大小写无关 C . C.MANAGER，大小写无关 D . D.INTERNAL，大小写无关

A . 事务改变前的旧数据 B . 事务改变后的新数据 C . 事务改变前后的数据 D . 重做日志

A . It bypasses the OS file system cache. B . A separate NFS interface is required for use across Linux, UNIX, and Windows platforms. C . It uses the operating system kernel NFS layer for user tasks and network communication modules. D . File systems need not be mounted by the kernel NFS system when being served through Direct NFS. E . Oracle Disk Manager can manage NFS on its own, without using the operating system kernel NFS driver.

A .  It does not allow you to change the moving window size. B .  Adaptive threshold functionalities use it by default to compute statistics. C .  It is created by default with the window size being equal to the AWR retention time. D .  It is created when the first snapshot is collected by the Automatic Workload Repository （AWR）.

A .  The DBWn process writes to the datafile. B .  Changes in the background process are recorded. C .  The log file is updated with the current SCN number. D .  The System Change Number （SCN） is recorded in the control file. E .  The changes to the listener configuration in the listener.ora file are recorded.

A . shutdown B . shutdown immediate C . shutdown abort D . shutdown nomount

A . A、由于目前的切换机制，语音电话在切换前，UE和RNC都不知道GSM网络的负荷情况，就可能出现GSM网络拥塞造成切换失败的情况 B . B、GSM网络拥塞造成切换失败情况应该是在某个特定时段出现的，不会总是切换失败 C . C、GSM网络拥塞造成切换失败，可以通过调整TD侧的2G外部邻区来避免 D . D、GSM网络拥塞造成的2/3G切换失败，UE无法回滚回TD网络

A . 0 B . 10 C . 20 D . 50 E . 100

A . Schedule enough down time to backup, upgrade and reboot.  B . Backup, upgrade, then schedule enough down time to reboot the system. C . Backup, then schedule enough down time to upgrade and reboot the system.  D . There are no scheduling concerns because no down time is required.

A . commit B . select C . update D . drop E . delete

A . It utilizes the OS file system cache. B . A traditional NFS mount is not required when using Direct NFS. C . Oracle Disk Manager can manage NFS on its own, without using the operating kernel NFS driver. D . Direct NFS is available only in UNIX platforms. E . Direct NFS can load-balance I/O traffic across multiple network adapters.

A．PL/SQL B．procedures C．triggers D．transactions

A．一致性 B．隔离性 C．持久性 D．原子性

A．UNDO_MANAGEMENT B．UNDO_TABLESPACE C．UNDO_BLOCK D．以上说法都不对

是 否