Manually， you set the consumer group of all of the newly created users to MYDB_GRP. You want the users to be able to change their consumer groups as per the application requirement. What was the first step that was needed in the process to achieve this objective？（） ["The user must have been granted the DBA role.","The user must have been granted the switch privilege as a part of a role.","The user must have been granted the Resource Manager administrator privilege.","The user must have been granted the switch privilege by using the DBMS_RESOURCE_MANAGER_PRIVS package."]
病毒的化学组成及各组成，它们各自的作用是什么？
You work as a database administrator for Supportcenter.cn. Users complain that their query is taking a long time to complete. You suspect the database buffer cache size to be the reason， and you define an alert to be generated when the buffer cache hit metric goes below 85%. When you observe the dynamic performance views， you find that the buffer cache hit ratio is 81% but no alerts are being generated. What could be the reason for this problem？（） ["The advisory memory has been turned off.","The DB_CACHE_ADVICE parameter has been set to OFF in the parameter file.","The STATISTICS_LEVEL parameter has been set to BASIC in the parameter file.","The TIMED_STATISTICS parameter has been set to FALSE in the parameter file.","The STATISTICS_LEVEL parameter has been set to TYPICAL in the parameter file."]
步进电动机的转速（）。 ["与电源脉冲幅值成正比","与电源脉冲数成正比","与电源脉冲宽度成正比","与电源脉冲频率成正比"]
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？（） ["Save the baseline in the database","Save the baseline in the Database Control Home Page","Create a procedure to read and apply the baseline to disk I\/O metrics","Apply the baseline to the disk I\/O metrics in the Mange Metrics page","Alter the disk I\/O metrics to include baseline by using the ALTER METRICScommnd"]
对（）系统每年停电不超过三次。
