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单项选择题X 纠错

You are managing an Oracle Database 11g database. You want to ensure the recovery of thedatabase to the point of failure.
Which configuration will you do to accomplish the task（）

A.Multiplex all database files
B.Configure the Flash Recovery Area.
C.Configure the database instance for ARCHIVELOG mode.
D.Configure the FAST_START_MTTR_TARGET initialization parameter.

参考答案：

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单项选择题

The instance abnormally terminates because of a power outage. Which statement is true about redolog files during instance recovery（）

A.Inactive and current redo log files are required to accomplish recovery.
B.Online and archived redo log files are required to accomplish instance recovery.
C.All redo log entries after the last checkpoint are applied from redo log files to data files.
D.All redo log entries recorded in the current redo log file until the checkpoint position are applied to datafiles.

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多项选择题

You notice that the performance of the database has degraded because of frequent checkpoints. Which two actions resolve the issue（）

A.Disable automatic checkpoint tuning.
B.Check the size of the redo log file size and increase the size if it is small.
C.Set the FAST_START_MTTR_TARGET parameter as per the advice given by the MTTR Advisor.
D.Decrease the number of redo log members if there are more than one redo log members available in each redo log group.

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多项选择题

Which two statements are true about checkpointing（）

A.The checkpoint frequency decreases with the smaller redo log file size.
B.It ensures that all committed data is written to the data files during normal shutdown.
C.The frequent full checkpoint in a database can cause the overall degradation of the database performance.
D.It prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the online redo log files.

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多项选择题

Which two statements are true about setting the FAST_START_MTTR_TARGET initializationparameter to a nonzero value（）

A.The MTTR advisor will be disabled.
B.Automatic checkpoint tuning will be enabled.
C.The value for the LOG_CHECKPOINT_INTERVAL initialization parameter will be override the value forFAST_START_MTTR_TARGET.
D.The time taken to recover the instance after the crash is always exactly the same as the value given forthe FAST_START_MTTR_TARGET initialization parameter.

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单项选择题

ou are in the middle of a transaction updating a very important table. The machine on which adatabase was running reboots because of power outage. This caused a database instance failure.
Which statement is true in this situation（）

A.The online redo log files and archived redo log files are required to accomplish the recovery.
B.The uncommitted transaction will be committed at the next startup of the database instance.
C.The uncommitted transaction is rolled back automatically at the next opening of the database.
D.The DBA has to perform the recovery on the database to recover the uncommitted transaction.

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单项选择题

Given below is a list of scenarios：
1）A user terminates his session abnormally.
2）The connection between the server and the client application terminates because of a network failure.
3）A schema is accidentally dropped.
4）The tablespace is accidentally dropped from the database.
5）The hard disk gets corrupted and the data files in the disk are lost.
6）The database instance abnormally shuts down because of power failure.
Which scenarios require DBA intervention to perform recovery（）

A.4 and 5
B.1，3，and 6
C.4，5，and 6
D.3，4，and 5
E.1，2，and 6

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多项选择题

In which of the scenarios will the DBA perform recovery（）

A.The alert log file is corrupted.
B.A tablespace is accidentally dropped.
C.One of the redo log members is corrupted.
D.A database user terminates the session abnormally.
E.The hard disk on which the data file is stored is corrupted.

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单项选择题

View the Exhibit and examine the parameters.

User A executes the following command to update the TRANS table： SQL> UPDATE B.trans SET tr_amt=tr_amt+500 WHERE c_code=’C005’；
Before user A issues a COMMIT or ROLLBACK command， user B executes the following command onthe TRANS table：
SQL> ALTER TABLE trans MODIFY （tr_type VARCHAR2（3））；
What would happen in this scenario（）

A.The ALTER TABLE command modifies the column successfully.
B.The DDL operation gets higher priority and transaction for user a is rolled back.
C.The ALTER TABLE command waits indefinitely until user a ends the transaction.
D.The ALTER TABLE command fails after waiting for 60 seconds due to the resource being busy.

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单项选择题

Automatic Shared Memory Management is disabled for your database instance. You realize that thereare cases of SQL statements performing poorly because of repeated parsing activity， resulting indegradation of performance.
What would be your next step to improve performance？（）

A.Run the SQL Access Advisor.
B.Run the Memory Advisor for the sga.
C.Run the Memory Advisor for the pga.
D.Run the Memory Advisor for the shared pool.
E.Run the Memory Advisor for the buffer cache.

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单项选择题

View Exhibit1 and Exhibit2 to examine the current memory allocation and parameter settings，respectively.

Why are advisors not available for the shared pool and the buffer cache()

A.because the DB_CACHE_ADVICE parameter is set to OFF
B.because Automatic Memory Management （AMM） is disabled for the database instance
C.because Automatic Shared Memory Management （ASMM） is enabled for the database instance
D.because the values for the DB_CACHE_SIZE and SHARED_POOL_SIZE parameters were not setinitially

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