操作日志及日志文件组

1.给日志组添加日志文件

alter database add logfile member '/test/redo1b.log'

to group 4

2.切换日志

alter system switch logfile

3.删除日志文件

alter database drop logfile member '/test/redo4b.log'

4.删除文件组

alter database drop logfile group 4

5.添加日志组

alter database add logfile group 4

('/test/redo4.log')

size 4m