单选题You find today’s performance of your production database to be the best ever. Therefore， you want to be notified in the future whenever the performance degrades by 10% of today’s performance. What is the first step that you would take to ensure this？（）

第1题：

You have created a baseline metric， DISK_IO_BL， for the disk I/O metrics in your PROD database and you have been getting notifications whenever the database performance degrades. You optimize the database I/O to gain the performance and you decide to remove the baseline metrics. Which method would you use to remove the DISK_IO_BL baseline metrics？（）

• A、The baseline， once created， cannot be removed.
• B、Disable the baseline metrics in the Database Control Manage Metrics page.
• C、The baseline will be automatically removed once the database performance has been optimized.
• D、Drop the baseline metrics by usingDBMS_WORKLOAD_REPOSITORY.DROP_BASELINE procedure.

第2题：

You are working on the 24X7 database with high transaction volume， to ensure faster instance recovery on your database you set the FAST_START_MTTR_TARGET initialization parameter to a very low value. What effect it will have on the database？（）

• A、The database performance would be enhanced.
• B、The redo log files would be get filled more frequently.
• C、The overall database performance would be degraded.
• D、The mean time to recover （MTTR） would be increased.

第3题：

第4题：

You want to create a new optimized database for your transactional production environment to be used by a financial application. While creating the database， you want the Oracle software to take care of all basic settings to optimize the database performance. Which method would you use to achieve this objective？（）

• A、Use the CREATE DATABASE .. command to create the database with Oracle-managed files. 
• B、Use the Database Configuration Assistant (DBCA) to create the database with Oracle-managed files. 
• C、Use Enterprise Manager to create a new database with the Online Transaction Processing (OLTP) option. 
• D、Use Database Configuration Assistant (DBCA) to create the database with Transaction Processing template. 
• E、Use the CREATE DATABASE .. command to create the database with Automatic Storage Management (ASM) file system.

第5题：

You are maintaining the SALES database for eSoft Corporation. You have not configured ASMM on the database. You want to know what size of the SGA will provide the best performance.  Which advisor would you use to determine the suitable size of the SGA？（）

• A、 SQL Tuning Advisor
• B、 Undo Advisor
• C、 ADDM
• D、 Memory Advisor

第6题：

You find today’s performance of your production database to be the best ever. Therefore， you want to be notified in the future whenever the performance degrades by 10% of today’s performance. What is the first step that you would take to ensure this？（）

• A、create baseline metrics for today’s performance
• B、write the current database metrics to a database table and create a trigger to compare with future database statistics
• C、write the current database metrics to a flat file and create an operating script to compare with future database statistics
• D、write the current database metrics to a database table and create a procedure to compare with future database statistics
• E、write the current database metrics to a database table and submit a job using DBMS_JOB to compare with future database statistics

第7题：

You work as a database administrator for Supportcenter.cn. You want to be notified when the number of disk I/O increases by 10% of what it was yesterday. You create a baseline metric for yesterday’s disk I/O performance. How do you use the baseline metrics to achieve your objective？（）

• A、Save the baseline in the database
• B、Save the baseline in the Database Control Home Page
• C、Create a procedure to read and apply the baseline to disk I/O metrics
• D、Apply the baseline to the disk I/O metrics in the Mange Metrics page
• E、Alter the disk I/O metrics to include baseline by using the ALTER METRICScommnd

第8题：

第9题：

You work as a database administrator for Certkiller .com. In your database server， the parameter PLSQL_OPTIMIZE_LEVEL has been set to 2. What would this setting achieve？（）

• A、It degrades the run time and compiler performance.
• B、It provides better run time and compiler performance.
• C、It provides better optimization of the statement during parse time.
• D、It forces the rule based optimizer to be used for statement optimization.
• E、It provides better run time performance but slightly degraded compiler performance. 
• F、It provides better run time performance but slightly degraded run time performance.

第10题：

You find that the execution time of reports in your datawarehouse application is significantly high. You suspect the lack of indexes to be the reason for the degradation in performance. Which advisory component would you refer to， in order to determine the appropriate indexes？（）

• A、 Memory Advisor
• B、 Segment Advisor
• C、 SQL Access Advisor
• D、 Automatic Workload Repository （AWR）
• E、 Automatic Database Diagnostic Monitor （ADDM）