Linux运行级别的查看和修改
Linux运行级别从0~6,共7个。0:关机。不能将系统缺省运行级别设置为0,否则无法启动。1:单用户模式,只允许root用户对系统进行维护。2:多用户模式,但不能使用NFS(相当于Windows下的网上邻居)。3:字符界面...
虚拟机linux 安装oracle10g 写入目录/tmp 时出错
错误描述: 写入目录 /tmp/OraInstall2012-02-23_10-30-46AM 时出错。请确保此目录是可写的, 并且至少有 60 MB 的磁盘空间。无法继续安装。: 成功原因:安装文件须通过SSH或其他工具传输到本地,如果是通...
Oracle正则表达式(regular expression)
元字符 字符含义 举例说明 ^ 匹配字符串的开始位置(在[]中使用,此时它表示不接受该字符集合。 ^a:匹配以a开始的字符串 [^a]:匹配不含a的字...
Oracle修改初始化参数(initialization parameter)scope的选项
Use the SET clause of the ALTERSYSTEM statement to set or change initialization parameter values. Theoptional SCOPE clause specifies the scope ofa change as described in the following tab...
Oracle startup mount exclusive作用
If your Oracle server allows multiple instances to access a single database concurrently (Oracle Parallel Server option), choose whether to mount the database exclusively or in parallel. For example,...
LOG_ARCHIVE_FORMAT参数释义
The following variables can be used in the format:%s log sequence number%S log sequence number, zero filled%t thread number%T thread number, zero filled%a activation ID%d database ID%r res...
create和recreate index时缩短时间的选项
createing或re-creating index时,可以使用下面的选项减少创建时间: PARALLEL:默认情况下是NOPARALLEL。创建index时,多个进程可以同时工作。相对于单个server process顺序的执行创建index,通...
Oracle Block Change Tracking功能
通过使用block change tracking功能,可以提高Oracle incremental备份进程的效率。incremental backup的目的是只备份那些自上次备份以来发生过改变的block。然而,即使只有一小部分发生改变,incrementa...
归档日志路径三个参数DB_RECOVERY_FILE_DEST和LOG_ARCHIVE_DEST和LOG_ARCHIVE_DEST_n
LOG_ARCHIVE_DEST:指定归档文件存放的路径,该路径只能是本地磁盘,默认为’’。LOG_ARCHIVE_DEST_n:默认值为’’。Oracle最多支持把日志文件归档到10个地方,n从1到10。归档地址可以为本地磁盘,或者...
Oracle中control_file_record_keep_time和MAXLOGHISTORY参数
Oracle基于RMAN的备份方式可以分为catalog和nocatalog两种方式进行备份管理。其中,catalog方式需要一个catalog目录数据库,这个数据库一般运行在另外一台服务器上,RMAN把对数据库的备份恢复记录保留在ca...
lsnrctl中,SET PASSWORD和CHANGE_PASSWORD命令
CHANGE_PASSWORD Use the CHANGE_PASSWORD command to establish anencrypted password or change an encrypted password set with the PASSWORDS_listener_name parameter in the listener.ora file....
Oracle Scheduler概述
一、Overview of the SchedulerOrganizations havetoo many tasks, and manually dealing with each one can be daunting. To help yousimplify these management tasks, as well as offering a rich set off...
EMPHASIS和RATIO policy比较
1、 EMPHASISEMPHASIS CPU分配方法确定在resource plan中对不同consumer groups中的会话的重视程度。CPU占用率的分配级别为从1 到8,级别1的优先级最高。百分比指定如何将CPU资源分配给每一级中的各个co...
Oracle pending area
Ifyou do not use Enterprise Manager to create the resource plan or resourceconsumer groups,you must first create a pending area.Thefirst thing you must do to create or modify plan schem...
Oracle simple resource plan
You can quickly create a simple resource plan that willbe adequate for many situations using the CREATE_SIMPLE_PLAN procedure. This procedure enables you to create consumergroups and alloc...
Oracle SYSTEM_PLAN
SYSTEM_PLAN资源计划是提供的默认计划之一。它包含适用于下列使用者组的指令:l SYS_GROUP:SYS和SYSTEM用户的初始使用者组。l OTHER_GROUPS:用于所有属于活动资源计划之外...
Oracle Automatic PGA Memory Management
理想情况下,工作区的大小足够大到能容纳其相关SQL运算符分配的输入数据和辅助内存结构,这一大小被称为工作区的最佳大小。工作区大小小于最佳大小时,响应时间就会增加,因为要对部分输入数据执行额外的传输操作...
Oracle DB_nK_SIZE_CACHE参数
TheOracle database supports multiple block sizes in the same database.The standardblock size is used for the SYSTEM tablespace.You specify the standard blocksize by setting the initializa...
Oracle ASM添加磁盘组POWER OPTION
Use thisclause to manually rebalance the disk group. Automatic Storage Managementredistributes datafiles evenly across all drives. This clause is rarelynecessary, because Automatic Storag...
ASM Disk Group Template
一、template定义、作用 Templates areused to set redundancy (mirroring) and striping attributes of files created inan ASM disk group. When a file is created, redundancy and stripin...