Oracle性能调优：修改oracle为归档模式
修改oracle为归档模式1，查看是否为归档模式
SQL> archive log list;
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 31
Current log sequence 33
2，关闭数据库
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
3，启动数据库到mount模式
SQL> startup mount;
ORACLE instance started.
Total System Global Area 1224736768 bytes
Fixed Size 2020384 bytes
Variable Size 318770144 bytes
Database Buffers 889192448 bytes
Redo Buffers 14753792 bytes
Database mounted.
4，修改数据库为归档模式
SQL> alter database archivelog;
Database altered.
5，打开数据库库
SQL> alter database open;
SQL> SELECT NAME,created,log_mode FROM v$database;
NAME CREATED LOG_MODE
--------- --------- ------------
ORCL 04-JUN-12 ARCHIVELOG
Database altered.
6，查看归档日志的路径和目录
SQL> show parameter db_recovery_file_dest;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string /data/app/oracle/flash_recovery_area
db_recovery_file_dest_size big integer 2G
修改方法：
SQL> alter system set db_recovery_file_dest_size=20g;
SQL> alter system set db_recovery_file_dest='/app/arc';
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