FORCE LOGGING

• 如何将数据库设置成FORCE LOGGING模式?
  • 执行此命令可以在mount或者Open状态都可以.假如在open状态执行此命令，执行过程会消耗很长时间；推荐在mount状态下执行.

SQL>ALTER DATABASE FORCE LOGGING;

FORCE LOGGING Mode

• FORCE LOGGING mode is recommeded to ensure data consistency.
• FORCE LOGGING forces redo to be generated even when NOLOGGING operations are executed.
• Tempory tablespaces and temporary segments are not logged.
• FORCE LOGGING is recommended for both physical ad logical standby databases.
• Issue the following command on the primary databse:

SQL>ALTER DATABASE FORCE LOGGING;

从数据库动态性能视图中查看关于FORCE LOGGING信息

SQL> col name format a30
SQL> col database_name format a30
SQL> col force_logging format a30
SQL> select name,database_role,force_logging from v$database;

NAME                           DATABASE_ROLE    FORCE_LOGGING
------------------------------ ---------------- ------------------------------
ARCERZHA                       PRIMARY          NO