Oracle

#Oracle#

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Oracle 优化器

Oracle 优化器目录 什么是优化器基于规则优化器RBORBO的缺点基于成本的优化器CBO什么是CBOCBO相关概念_CardinalityCBO相关概念_可选择率CBO相关概念_可传递性CBO的局限性oracle 优化器模式的切换 正文 回到顶部什么是优化器  优化器是Oracle中的一个核心模块,它的作用是为用户输入的SQL选择一个它计算出来的最高效的执行计划。

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OCP-052考试题库汇总(34)-CUUG内部解答版

Where is an expdp operation tracked? A)dump files B)control file C)log files D)Automatic Diagnostic Repository(ADR) E)master table (MT) Answer: E 赵: 题译:哪里有一个 Exdp 操作跟踪? Master table 是一个临时 table,专门为 import pump 和 export pump 创建的,一旦完成就会自动被 drop。

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OCP-052考试题库汇总(33)-CUUG内部解答版

Which two can be exported by a non-administrative account by using Data Pump? A)directory objects B)tables C)tablespaces D)schemas E)database Answer: BD 赵: EXP 和 IMP 是客户端工具程序,它们既可以在客户端使用,也可以在服务端使用。

梓杰

Oracle 11g R2安装文档

Oracle 安装文档

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OCP-052考试题库汇总(32)-CUUG内部解答版

Which state must a database be to enable ARCHIVELOG ? A)NOMOUNT B)OPEN IN READ WRITE mode C)OPEN IN READ ONLY mode D)OPEN IN RESTRICTED mode E)MOUNT ...

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OCP-052考试题库汇总(31)-CUUG内部解答版

which four are true about the tools used to administer Oracle database? A)the Data Pump utility can be used to load data from text files.

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OCP-052考试题库汇总(30)-CUUG内部解答版

Which two are true about the Inventory directory? A)It is shared by all Oracle software installations on a single server.

优惠码大使

Linux iotop工具简介

Linux iotop工具简介iotop的简介: iotop是一款开源、免费的用来监控磁盘I/O使用状况的类似top命令的工具,iotop可以监控进程的I/O信息。它是Python语言编写的,与iostat工具比较,iostat是系统级别的IO监控,而iotop是进程级别IO监控。

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OCP-052考试题库汇总(29)-CUUG内部解答版

When does an incremental checkpoint occur ? A)when an online redo log switch occurs. B)when DBWn writes dirty buffers as part of its normal processing.

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OCP-052考试题库汇总(28)-CUUG内部解答版

Archivelog mode is enabled for your database and DB_CREATE_FILE_DEST is set to ‘/u01/oracle/db01’. The parameters, DB_CREATE_ONLINE_LOG_DEST_n and DB_RECOVERY_FILE_DEST, and not specified.

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OCP-052考试题库汇总(27)-CUUG内部解答版

Which two of these must be available READ/WRITE to keep a database open? A)all copies of the control file.

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OCP-052考试题库汇总(26)-CUUG内部解答版

Which three of these must be accessible to keep a database open? A)Control file. B)All members of a redo log group. C)SYSTEM tablespace. D)SYSAUX tablespace. E)spfile Answer: ABC 赵: 1 nomount:实例已经启动,进程和内存已经分配。

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OCP-052考试题库汇总(25)-CUUG内部解答版

Which four database objects never have any segments? A)A partitioned index B)A view selecting from a populated table C)An empty index D)An Oracle Loader type external table E)An empty table F)A view selecting from an empty table G)An Oracle Data Pump type external table Answer: BDFG 赵:视图和外部表不存在段。

北斗云

Superset对接Apache Druid数据源

一.简述 Apache Superset是一款由Airbnb开源的“现代化的企业级BI(商业智能)的Web应用程序”,其通过创建和分享Dashboard,为数据分析提供了轻量级的数据查询和可视化方案。

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OCP-052考试题库汇总(24)-CUUG内部解答版

Which structure can span multiple data files? A)a bigfile tablespace B)a permanent tablespace C)a segment D)a temporary tablespace E)an extent Answer...

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OCP-052考试题库汇总(23)-CUUG内部解答版

11g版本的OCP考试持续了好几年,一直比较稳定,直到2018年4月份左右,052考试不断的出现新的考题,虽然我们收集整理了不少,但新题还是难避免,这样出现一部分新题,我们收集一部分,持续了不短的时间。

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OCP-052考试题库汇总(22)-CUUG内部解答版

Which four are true about the Archive (ARCn) processes? A)They might be used during instance recovery.

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OCP-052考试题库汇总(21)-CUUG内部解答版

Which two are true about the Archive (ARCn) processes? A)They archive redo directly from the redo log buffer.