123.You used the IMMEDIATE option to shut down your database instance. Consider the steps that may
occur when a database instance is started and database is opened:
1: SGA is allocated.
2: Control file is read.
3: Redo log files are opened.
4: Instance recovery is started.
5: Background processes are started.
6: Data file headers are checked for consistency.
7: Server parameter file or the initialization parameter file is read.
Which option has the correct order in which these steps occur?
A.7, 1, 5, 2, 3, 6, 4
B.1, 5, 7, 2, 3, 6; step 4 is not required
C.7, 1, 5, 2, 3, 6; step 4 is not required
D.1, 2, 3, 5, 6, 4; step 7 is not required
答案:C
解析:参考121题
启动过程是首先读取spfile如果没有读取pfile,在nomount阶段通过配置文件分配sga,启动所需的全部后台进程
打开报警文件(alertSID.log)和追踪文件(trace),然后进入mount阶段启动实例,利用初始化参数文件中的说明锁定并打开控制文件
读取控制文件获取重做日志文件和数据文件的名字和状态,但是并不检查他们是否存在,然后进入open阶段
打开所有联机数据文件,打开所有联集重做日志文件,并且检查他们的scn,这道题说是immediate说明是一致性关闭的
数据库,因此不需要进行恢复
occur when a database instance is started and database is opened:
1: SGA is allocated.
2: Control file is read.
3: Redo log files are opened.
4: Instance recovery is started.
5: Background processes are started.
6: Data file headers are checked for consistency.
7: Server parameter file or the initialization parameter file is read.
Which option has the correct order in which these steps occur?
A.7, 1, 5, 2, 3, 6, 4
B.1, 5, 7, 2, 3, 6; step 4 is not required
C.7, 1, 5, 2, 3, 6; step 4 is not required
D.1, 2, 3, 5, 6, 4; step 7 is not required
答案:C
解析:参考121题
启动过程是首先读取spfile如果没有读取pfile,在nomount阶段通过配置文件分配sga,启动所需的全部后台进程
打开报警文件(alertSID.log)和追踪文件(trace),然后进入mount阶段启动实例,利用初始化参数文件中的说明锁定并打开控制文件
读取控制文件获取重做日志文件和数据文件的名字和状态,但是并不检查他们是否存在,然后进入open阶段
打开所有联机数据文件,打开所有联集重做日志文件,并且检查他们的scn,这道题说是immediate说明是一致性关闭的
数据库,因此不需要进行恢复