linux df 命令 不能返回命令提示符状态。
执行df 命令后,只显示部分挂载的目录信息,没后自动回到 提示符。检查 /etc/fstab 文件,看到最后一行是 挂载一个 NFS 目录。检查NFS 服务器,发现NFS服务没有开启。开启NFS 服务,回到 执行DF 命令的 机器, mount -a 重新挂载所有 /etc/fstab 文件中记录的目录。再次执行 df 命令, 显示出所有信息,包括NFS 挂载的目录,并回到命令提示符状态。[@more@]
linux 中寻找文件 的2个命令比较
一号选手 locate 性格讨巧,但是它只查看文件记录列表。 文件实际是否存在,它可不管哦。缺点,你把某个文件丢掉,它还是会和你说,文件还在那。二号选手 find性格老实,它可不看记录,只相信自己的眼睛,它会把每个地方都翻一遍。缺点,需要时间和CPU。[@more@]
linux下的 DVD刻录软件 nero 安装和试用。
狗狗搜索下 nerolinux 3.0下载得到安装包 IT168.com-86701nerolinux-3.0.2.1-x86.rpm打开SecureCRT,并连接到linux上。输入rz 选择安装包,确定就开始上传了。rpm -ivh IT168.com-86701nerolinux-3.0.2.1-x86.rpm // 安装rpm -qa | grep nero // 能看到已经安装好了。nerolinux-3.0.3.1-1开一个VNC桌面。登录VNC。
042-Your database is having two control files, three redo log file groups with two members in each g
93. Your database is having two control files, three redo log file groups with two members in each group. Failure of which file would cause an instance to shut down?A) any control fileB) any archive log fileC) one of the redo log membersD) loss of the initialization parameter fileE) any data file belonging to the default permanent tablespace1,修改control file 数量从默认的3个变为 题中描述的2个。[oracle@test ~]$ sqlplus / as sysdbaSQL> show parameter db_name; #看下是那个数据库NAME
数据库OPEN下,丢失部分或所有control file 是否会导致 实例关闭。
93. Your database is having two control files, three redo log file groups with two members in each group. Failure of which file would cause an instance to shut down? A) any control file B) any archive log file C) one of the redo log members D) loss of the initialization parameter file E) any data file belonging to the default permanent tablespace 1,修改control file 数量从默认的3个变为 题中描述的2个。 [oracle@test ~]$ sqlplus / as sysdba SQL> show parameter db_name; #看下是那
安装RAC 报错 集锦
安装RAC 报错 集锦整理中[@more@]
删除一个表空间后,属于这个表空间的 datafile 不会删除。
SQL> drop tablespace BT including contents;Tablespace dropped.D:oracleproduct10.2.0oradatajdb 的目录2012-03-23 09:44 <DIR> .2012-03-23 09:44 <DIR> ..2012-03-27 11:24 19,933,437,952 BT1.DBFBT1.DBF 还在。需要手动删除。[@more@]删
SQLPLUS 下输入命令的字符长度限制
SQL> create table a99 (a1 int,-- a500 int);SP2-0027: Input is too long (> 2499 characters) - line ignored [@more@]
set unused 是否会释放存储空间
1,创建一个多列的体积较大的表;2,观察表的HWM2,set unused 部分列;3,观察表的HWM [@more@]
db_recovery_file_dest_size 空间不足导致无法关闭。
放大 SGA_MAX_SIZE 导致 shutdown immediate ,shutdown abort无响应。 windows 下杀 ORACLE进程。然后重新启动 oracle 服务。SQL> startup nomount;ORA-00443: background process "PMON" did not start 重启了服务器,还是老样子。SQL> startup nomount;ORA-00443: background process "PMON" did not start 观察log;D:oracleproduct10.2.0adminjdbbdumpalert_jdbs.logORA-19815: 警告: db_recovery_file_dest_size 字节 (共 2147483648 字节) 已使用 98.79%, 尚有 26083328 字节可用。Microsoft Wi
ORACLE- Secure Backup Documentation
Welcome Welcome to the Oracle Secure Backup Documentation Library. Oracle Secure Backup is a general-purpose network data protection tool that simplifies and automates the backup and restore of files on a file system. The software can also serve as a media management layer for Recovery Manager through the SBT interface. You can use Oracle Secure Backup with a wide variety of tertiary devices, including tape drives, tape libraries, and devices accessed through the Network Data Ma