强制日志切换

强制日志切换

 

 

SQL> archive log list;

Database log mode              Archive Mode

Automatic archival             Enabled

Archive destination            USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence     163

Next log sequence to archive   165

Current log sequence           165

SQL> alter system switch logfile;

System altered.

SQL> /             

System altered.

SQL> archive log list;

Database log mode              Archive Mode

Automatic archival             Enabled

Archive destination            USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence     165

Next log sequence to archive   167

Current log sequence           167

SQL> 

 

 

 启动归档模式：

　　SQL> archive log list;

 

　　Database log mode              No Archive Mode

 

　　Automatic archival             Disabled

 

　　Archive destination            USE_DB_RECOVERY_FILE_DEST

 

　　Oldest online log sequence     25

 

　　Current log sequence           27

 

　　SQL> show parameter log_archive_start

 

　　NAME                                 TYPE        VALUE

 

　　------------------------------------ ----------- ------------------------------

 

　　log_archive_start                    boolean     FALSE

 

　　SQL> shutdown immediate;

 

　　Database closed.

 

　　Database dismounted.

 

　　ORACLE instance shut down.

 

　　SQL> startup mount;

 

　　ORACLE instance started.

 

　　Total System Global Area 3204448256 bytes

 

　　Fixed Size                  1304912 bytes

 

　　Variable Size             651957936 bytes

 

　　Database Buffers         2550136832 bytes

 

　　Redo Buffers                1048576 bytes

 

　　Database mounted.

 

　　SQL> alter database archivelog;

 

　　Database altered.

 

　　SQL> alter database open;

 

　　Database altered.

 

　　SQL> archive log list;

 

　　Database log mode              Archive Mode

 

　　Automatic archival             Enabled

 

　　Archive destination            USE_DB_RECOVERY_FILE_DEST

 

　　Oldest online log sequence     25

 

　　Next log sequence to archive   27

 

　　Current log sequence           27

 

　　SQL>

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