在043里面有下面这个题目

You want an ASM instance to manage the files of your database. To achieve this objective, you

specify the following parameters in the parameter file of the database:

INSTANCE_TYPE = RDBMS

DB_NAME = PROD

LARGE_POOL_SIZE = 8MB

DB_BLOCK_SIZE = 4K

LOG_ARCHIVE_DEST = +dgroupA

LOG_ARCHIVE_FORMAT = "$ORACLE_SID_%s_%t.%t"

DB_CREATE_FILE_DEST = +dgroupA

COMPATIBLE = 10.1.0.2.0

CONTROL_FILES = +dgroupA

Which parameter would be ignored while starting up the instance for the database PROD?

问以上那个参数会被数据库实例忽略,题目的正确答案是DB_CREATE_FILE_DEST这个参数会被忽略,下面解释一下为什么

首先需要了解DB_CREATE_FILE_DEST,DB_CREATE_ONLINE_LOG_DEST_n这个2个参数的作用

(1)DB_CREATE_FILE_DEST这个参数,用于确定创建datafiles,tempfiles文件缺省路径

(2)DB_CREATE_ONLINE_LOG_DEST_n这个参数,用于确定创建online redo log files,control files文件缺省路径

但是当DB_CREATE_FILE_DEST,DB_CREATE_ONLINE_LOG_DEST_n同时使用的时候,DB_CREATE_ONLINE_LOG_DEST_n将会覆盖DB_CREATE_FILE_DEST,使DB_CREATE_FILE_DEST失效


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