The application workload on your database is same between 10 a.m. and 11 a.m. on weekdays. Suddenly you observe poor performance between 10 a.m. and 11 a.m. in the middle of the week. How would you identify the changes in configuration settings， workload profile，and statistics to diagnose the possible causes of the performance degradation？（） by using the SQL access advisor。 by using the Automatic Workload Repository report。 by running the Automatic Database Diagnostic Monitor （ADDM）。 by using the Automatic Workload Repository Compare Period report。 by analyzing the output of the V$ACTIVE_SESSION_HISTORY view。
安全限值即卫生标准，下列可用于描述安全限值的有（）。 每日允许摄入量。 最高容许浓度。 阈限值。 参考剂量。
You configured the Flash Recovery Area for your database. The database instance has been started inARCHIVELOG mode and the LOG_ARCHIVE_DEST_1 parameter is not set. What will be the implications onthe archiving and the location of archive redo log files（） Archiving will be disabled because the destination for the redo log files is missing.。 The database instance will shut down and the error details will be logged in the alert log file.。 Archiving will be enabled and the destination for the archived redo log file will be set to the Flash RecoveryArea implicitly.。 Archiving will be enabled and the location for the archive redo log file will be created in the default location$ORACLE_HOME/log.。
Your database is using shared server configuration. Which optional memory structure would you configure to store the User Global Area （UGA） information and improve the shared pool performance？（） large pool。 streams pool。 keep buffer cache。 recycle buffer cache。
国家电网公司对风电场电压运行范围的规定是什么？
A programmer has an algorithm that requires a java.util.List that provides an efficient implementation of add(0, object), but does NOT need to support quick random access. What supports these requirements?（）
