Oracle基础 04 归档日志 archivelog

--查看归档模式
archive log list

select log_mode from v$database;

--修改为归档模式(mount下)
alter database archivelog

--修改为非归档模式(mount下)
alter database noarchivelog

--切换日志三个相关命令
SQL> alter system switch logfile;
SQL> alter system archive log current;
SQL> alter system checkpoint;

--修改recovey目录
show parameter db_recover
alter system set db_recovery_file_dest='/u01/app/oracle/arch' scope=both;
alter system set db_recovery_file_dest_size=2g;

--v$recovery_file_dest
SYS@ test11g> col name for a20
SYS@ test11g> select * from v$recovery_file_dest;

NAME                 SPACE_LIMIT SPACE_USED SPACE_RECLAIMABLE NUMBER_OF_FILES
-------------------- ----------- ---------- ----------------- ---------------
/u01/app/oracle/flas  4039114752  344297472         343966720               8
h_recovery_area

--检查一下flash recovery area的使用情况：
SYS@ test11g> set linesize 100
SYS@ test11g> select * from v$flash_recovery_area_usage;

FILE_TYPE            PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES
-------------------- ------------------ ------------------------- ---------------
CONTROL FILE                          0                         0               0
REDO LOG                              0                         0               0
ARCHIVED LOG                       4.26                      4.26               6
BACKUP PIECE                       4.26                      4.25               2
IMAGE COPY                            0                         0               0
FLASHBACK LOG                         0                         0               0
FOREIGN ARCHIVED LOG                  0                         0               0