137 While Monitoring the space usage in your database that is in ARCHIVELOG mode you observed that t
2015-11-28 10:53
1116 查看
137
While Monitoring the space usage in your database that is in ARCHIVELOG mode you observed that the
flash recovery area does not have enough free space to accommodate any more files and you do not have
necessary permissions to add more space to it.
Identify the two events that can occur in the event of a log switch? (Choose two.)
A. An entry is created in the alert log file and the database instance continues to function normally
B. The log switch hangs occur for transactions until free space is available in the flash recovery area
C. The Oracle database server deletes a file that is on the obsolete file list to make free space in the flash
recovery area
D. The database instance status is implicitly changed to RESTRICTED mode and file creations to the
flash recovery area are prevented
Correct Answer: BC
Section: (none)
Explanation
Explanation/Reference:
Explanation:
https://netfiles.uiuc.edu/jstrode/www/oraelmt/redo_log_files.html
Log Switch:
A log switch occurs when the database stops writing to one online redo log file and begins writing to
another.
Normally, a switch occurs when the current online redo log file is full and writing must continue. However,
you can configure log switches to occur at regular intervals, regardless of whether the current online redo
log file is filled, and force log switches manually.
Incremental checkpoints:
An incremental checkpoint is a type of thread checkpoint partly intended to avoid writing large numbers of
blocks at online redo log switches. DBWn checks at least every three seconds to determine whether it has
work to do. When DBWn writes dirty buffers, it advances the checkpoint position, causing CKPT to write
the checkpoint position to the control file, but not to the data file headers.
While Monitoring the space usage in your database that is in ARCHIVELOG mode you observed that the
flash recovery area does not have enough free space to accommodate any more files and you do not have
necessary permissions to add more space to it.
Identify the two events that can occur in the event of a log switch? (Choose two.)
A. An entry is created in the alert log file and the database instance continues to function normally
B. The log switch hangs occur for transactions until free space is available in the flash recovery area
C. The Oracle database server deletes a file that is on the obsolete file list to make free space in the flash
recovery area
D. The database instance status is implicitly changed to RESTRICTED mode and file creations to the
flash recovery area are prevented
Correct Answer: BC
Section: (none)
Explanation
Explanation/Reference:
Explanation:
https://netfiles.uiuc.edu/jstrode/www/oraelmt/redo_log_files.html
Log Switch:
A log switch occurs when the database stops writing to one online redo log file and begins writing to
another.
Normally, a switch occurs when the current online redo log file is full and writing must continue. However,
you can configure log switches to occur at regular intervals, regardless of whether the current online redo
log file is filled, and force log switches manually.
Incremental checkpoints:
An incremental checkpoint is a type of thread checkpoint partly intended to avoid writing large numbers of
blocks at online redo log switches. DBWn checks at least every three seconds to determine whether it has
work to do. When DBWn writes dirty buffers, it advances the checkpoint position, causing CKPT to write
the checkpoint position to the control file, but not to the data file headers.
相关文章推荐
- Add Digits
- 深入浅出AngularJs中的Service
- spring 入门学习
- 34.c/c++程序员面试宝典-模板
- 圆形imagevie
- 推送
- 《TCP/IP详解 卷1:协议》 读书笔记 第一章 概述
- 企业级
- 深入学习微框架Spring-boot
- 黑马程序员——javaSE_多线程
- MathJax使用LaTeX语法编写数学公式教程
- Javascript编程中几种继承方式比较分析
- 第一次window 7设置mysql环境中遇到的问题以及解决办法
- android--listView的adapter模板
- Shader - BindChannels
- ImageLoaderIndicator
- 快速排序算法
- 上拉刷新,下拉刷新listview
- AES加密算法动画演示
- IS-Apache-Tomcat的区别