当初始化数据库时，系统会在活动日志目录中分配一定数量、指定大小的主日志文件。
When the database is initialized, the system allocates a certain number of primary log files of a specified size in the active log directory.
这表示在第一次连接到数据库时，主日志的总数等于驻留在活动日志目录中的日志文件的总数。
This means that upon first connection to the database, the total number of primary logs is equal to the total number of log files residing in the active log directory.
第12.6节的场景，描述活动的物理备用数据库为读/写报告数据库，然后与主数据库重新同步数据库。
Section 12.6for a scenario that describes activating a physical standby database as a read/write reporting database, and then resynchronizing the database with the primary database.
第12.6节的场景，描述活动的物理备用数据库为读/写报告数据库，然后与主数据库重新同步数据库。
Section 12.6for a scenario that describes activating a physical standby database as a read/write reporting database, and then resynchronizing the database with the primary database.
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