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控制文件在恢复的时候的作用!
控制文件纪录了一下内容:
The database name to which the control file belongs. A control file can belong to only one
database.
The database creation time stamp.
The name, location, and online/offline status information of the datafiles.
The name and location of the redo log files.
Redo log archive information.
Tablespace names.
The current log sequence number , which is a unique identifier that is incremented and recorded when an online redo log file is switched.
The most recent checkpoint information.
The beginning and ending of undo segments.
Recovery Manager’s backup information. Recovery Manager (RMAN) is the Oracle utility you use to back up and recover databases.
但是如果控制文件全部损坏了的话,如果用以前的备份的control 的文本文件重建的话(alter database backup controlfile to trace),不是就会丢失上面的信息吗?
但是这些信息对于数据库的恢复,产生重要的作用(
例如:
The current log sequence number , which is a unique identifier that is incremented and recorded when an online redo log file is switched.
The most recent checkpoint information.
The beginning and ending of undo segments.
Recovery Manager’s backup information. Recovery Manager (RMAN) is the Oracle utility you use to back up and recover databases
)
如果丢失了全部的控制文件,就会丢失上面的信息,那么作数据库恢复的时候怎么来定位数据恢复的位置呢,特别是纪录了rman这种备份与恢复工具的信息?是否意味着,只能作不完全恢复呢?
谢谢指教啊! |
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