[单选]
You upgraded from a previous Oracle database version to Oracle Database version to Oracle Database12c. Your database supports a mixed workload. During the day, lots of insert, update, and deleteoperations are performed. At night, Extract, Transform, Load (ETL) and batch reporting jobs are run.
The ETL jobs perform certain database operations using two or more concurrent sessions.After the upgrade, you notice that the performance of ETL jobs has degraded. To ascertain the cause ofperformance degradation, you want to collect basic statistics such as the level of parallelism, totaldatabase time, and the number of I/O requests for the ETL jobs.
How do you accomplish this?（）

A . Examine the Active Session History (ASH) reports for the time period of the ETL or batch reporting runs.
B . Enable SQL tracing for the queries in the ETL and batch reporting queries and gather diagnostic data from the trace file.
C . Enable real-time SQL monitoring for ETL jobs and gather diagnostic data from the V$SQL_MONITOR view.
D . Enable real-time database operation monitoring using the DBMS_SQL_MONITOR.BEGIN_OPERATION function, and then use the DBMS_SQL_MONITOR.REPORT_SQL_MONITOR function to view the required information.

Which method will complete this class？（） public int compareTo（Object o）{/* more code here */}。 public int compareTo（Score other）{/* more code here */}。 public int compare（Score s1， Score s2）{/* more code here */}。 public int compare（Object o1， Object o2）{/* more code here */}。某药半衰期为10小时，一次给药后，药物在体内基本消除时间为（）． 10小时左右。 20小时左右。 1天左右。 2天左右。 5天左右。齿轮泵噪音较大且压力较低，一般用于（）系统中。 Identify four uses of the Oracle Scheduler.（） enables Oracle database to schedule which processes execute on which processors in a multiple CPU environment。 enables Oracle database to do patches according to a DBA-defined schedule。 enables you to schedule the execution of jobs based on time。 enables you to execute jobs in a clustered environment。 enables you to periodically execute operating systemscript files located on the same server as the database。 enables you to create a job that makes use of saved programs and schedules。 enables you to automate the management of the jobs that are created using the DBMS_JOB package。植物分类鉴定工具

You upgraded from a previous Oracle database version to Oracle Database version to Oracle Database12c. Your database supports a mixed workload. During the day, lots of insert, update, and deleteoperations are performed. At night, Extract, Transform, Load (ETL) and batch reporting jobs are run.
The ETL jobs perform certain database operations using two or more concurrent sessions.After the upgrade, you notice that the performance of ETL jobs has degraded. To ascertain the cause ofperformance degradation, you want to collect basic statistics such as the level of parallelism, totaldatabase time, and the number of I/O requests for the ETL jobs.
How do you accomplish this?（）

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