使用（）登高作业时，闭锁部件应完好，底部坚实防滑.

A、铁架

B、桌子

C、凳子

D、梯子

Which of the following is a prerequisite for running DBMS_TDB.CHECK_DB to a successful completion？（）

A、 The database must be in read-write mode.

B、 The database must have no external files.

C、 The database must open in read-only mode.

D、 The database must be mounted but not opened.

Which three statements about performance analysis by SQL Performance Analyzer are true? （）(Choose three.)

It detects changes in SQL execution plans.

It produces results that can be used to create the SQL plan baseline.

The importance of SQL statements is based on the size of the objects accessed.

It generates recommendations to run SQL Tuning Advisor to tune regressed SQLs.

It shows only the overall impact on workload and not the net SQL impact on workload.

A database is running In ARCHIVBXXMS mode. It has two online redo log groups and each group has one member.  A LGWR Input/output （I/O） fells due to permanent media failure that has resulted In the loss of redo log file and the LWGR terminates causing the instance to crash. The steps to recover from the loss of a current redo log group member in the random order are as follow.   1） Restore the corrupted redo log group. 2） Restore from a whole database backup.  3） Perform incomplete recovery.  4） Relocate by renaming the member of the damaged online redo log group to a new location.  5） Open the database with the RESETLOGS option.  6） Restart the database instance.  7） Issue a checkpoint and clear the log.   Identify the option with the correct sequential steps to accomplish the task efficiently（）.  

A、 1，3，4，and 5

B、 7，3，4. and 5

C、 2，3，4，and 5

D、 7，4，3，and 5

E、 Only 6 is required

What would indicate intra-partition parallelism in an Optimizer Plan?（）

A、BTQ  

B、LTQ  

C、IP  

D、DTQ

消费需求的（）反映到日常生活中就是消费时尚和消费流行。

A、多样性

B、层次性

C、发展性

D、时代性