10.Which two are true about consistent database backups? A) They can only be taken when a RECOVERY CATALOG is used. B) They can only be taken if the database Is in ARCHIVELOG mode. C) They can only be taken If shutdown NORMAL, TRANSACTIONAL, or IMMED…

8.Which two are true about the Fast Recovery Area (FRA)? A) It should be larger than the database. B) Space management In the FRA Is Influenced by the database backup retention policy. C) A database must be in ARCHIVELOG mode to use the FRA. D) It mu…

16.Your database Is configured In archivelog mode. The USERS01 tablespace Is currently online. You are required to take the tablespace offline. Which clause or clauses ensure that no media recovery is required when the tablespace Is brought back onli…

11.Which three are true about UNDO data? A) It is used to roll back failed transactions. B) It is used to rewind a database by using FLASHBACK DATABASE. C) It is used to recover dropped tables by using FLASHBACK TABLE … TO BEFORE DROP. D) It is used…

9.Which is true about the Automatic Diagnostic Repository (ADR)? A) It includes diagnostic data for critical errors for each server and background process. B) Its location is always set by the ORACLE_BASE variable. C) It is used only if the DIAGNOSTI…

17.Which two statements are true about tablespaces? A) A database can contain multiple undo tablespaces. B) A database can contain only a single temporary tablespace. C) A database instance stores undo data In the SYSTEM tablespace If no undo tablesp…

14.Which command is used to display files that no longer conform to the backup retention policy? A) REPORT OBSOLETE B) SHOW DATAFILE BACKUP COPIES C) CROSSCHECK BACKUP D) LIST EXPIRED BACKUP Answer:A…

13.Which two are true about AWR snapshots? A) They are stored In the SYSAUX tablespace. B) They are not generated if STATISTICS_LEVEL Is set to TYPICAL. C) They can be modified by using DMLs. D) They can be retained forever. E) They are always create…

Libre 6006 「网络流 24 题」试题库 / Luogu 2763 试题库问题 (网络流,最大流) Description 问题描述: 假设一个试题库中有n道试题.每道试题都标明了所属类别.同一道题可能有多个类别属性.现要从题库中抽取m 道题组成试卷.并要求试卷包含指定类型的试题.试设计一个满足要求的组卷算法. 编程任务: 对于给定的组卷要求,计算满足要求的组卷方案. Input 第1行有2个正整数k和n (2 <=k<= 20, k<=n<= 1000) k 表示题库中试…

2018年最新Java面试题及答案整理(持续完善中…) 基础篇 基本功 面向对象特征 封装,继承,多态和抽象 封装封装给对象提供了隐藏内部特性和行为的能力.对象提供一些能被其他对象访问的方法来改变它内部的数据.在 Java 当中,有 3 种修饰符: public, private 和 protected.每一种修饰符给其他的位于同一个包或者不同包下面对象赋予了不同的访问权限.下面列出了使用封装的一些好处: 通过隐藏对象的属性来保护对象内部的状态. 提高了代码的可用性和可维护性,因为对象的行为可以…