CMS专题
单选题You are maintaining the SALES database for an organization. You have enabled the Flashback Database feature and want to estimate the flashback space required for future operations. Which view would you query to estimate the flashback space required？（）
题目
V$DATABASE
V$FLASHBACK_DATABASE_STAT
V$FLASHBACK_DATABASE_LOG
V$RECOVERY_FILE_DEST
相似问题和答案
第1题：
You are the administrator of a SQL Server 2000 computer. The server contains database named Sales. Users report that they cannot add new data to the database. You examine the properties of the database. The database is configured as shown in the Sales Properties exhibit.
You examine drive E. The hard disk is configured as shown in the Local Disk Properties exhibit.
You want the users to be able to add data, and you want to minimize administrative overhead. What should you do?
A．Increase the maximum file size of Sales_Data to 1,500MB.
B．Use the DBCC SHRINKDATABASE statement.
C．Set automatic file growth to 10 percent.
D．Create another data file named Sales_Data2 in a new SECONDARY filegroup.
解析：Explanation: By examining the first exhibit we see that the database has reached its maximum size of 1001 MB. The data file is located on drive E and the second exhibit shows us that there is enough free space on that disk to increase the maximum size of the data file to 1,500 MB.
Incorrect Answers:
B: DBCC SHRINKDATABASE could possibly shrink the database and new records could be added for a while, but it would just be a temporary solution.
C: The database is already set to automatic file growth, but it has reached the maximum size.
D: The primary file has reached it maximum size. A secondary filegroup would help if it was set to the default file group. New data would still be added to the primary filegroup which is at its maximum size.
第2题：
You are maintaining your database in Oracle10g. You find that the number of languages that should be supported in your database has increased. The character set of your database is UTF8. You decide to migrate your database to the AL16UTF16 national character set. How will you migrate your database from UTF8 to AL16UTF16？（）
- A、 by using the RMAN utility
- B、 by using the export/import utility
- C、 by using the ALTER DATABASE command
- D、 by enabling the change tracking feature
正确答案:C
第3题：
You are the database administrator for a retail company. The company owns 270 stores. Every month, each store submits approximately 2,000 sales records, which are loaded into a SQL Server 2000 database at the corporate headquarters.
A Data Transformation Services (DTS) package transforms the sales records, as they are loaded. The package writes the transformed sales records to the Sales table, which has a column for integer primary key values. The IDENTITY property automatically assigns a key value to each transformed sales record.
After loading this month's sales data, you discover that a portion of the data contains errors. You stop loading data, identify the problem records, and delete those records from the database.
You want to reuse the key values that were assigned to the records that you deleted. You want to assign the deleted key values to the next sales records you load. You also want to disrupt users' work as little as possible.
What should you do?
A．Export all records from the Sales table to a temporary table. Truncate the Sales table, and then reload the records from the temporary table.
B．Export all records from the Sales table to a text file. Drop the Sales table, and then reload the records from the text file.
C．Use the DBCC CHECKIDENT statement to reseed the Sales table's IDENTITY property.
D．Set the Sales table's IDENTITY_INSERT property to ON. Add new sales records that have the desired key values.
解析：Explanation: DBCC CHECKIDENT is used to check the current identity value for the specified table. It can be set to correct the identity value by specifying the RESEED option with DBCC CHECKIDENT.
Note: Example:
Assume that we have a table called test with an identity column with seed (1,1) and 1000 rows and that we delete row 901 to 950. We could then issue the command
DBCC CHECKIDENT (test, reseed, 900)
And load the 50 missing rows. These rows would get the values 901, 902, …,950 in the identity column.
We should then set the identity value to 1000 again:
DBCC CHECKIDENT (test, reseed, 1000)
So that the next new row will have identity 1001.
Incorrect Answers:
A: Exporting the data from the Sales table and then reloading the data will not correct errors contained in the table as these errors will also be exported as they are part of the data already in the table.
B: Exporting the data from the Sales table and then reloading the data will not correct errors contained in the table as these errors will also be exported as they are part of the data already in the table.
D: The SET IDENTITY_INSERT command allows explicit values to be inserted into the identity column of a table. To reuse the old key values from the rows that was deleted would require manual commands and would be awkward. This is not the best solution.
第4题：
You are maintaining subscriptions in an Oracle database. Which property of that subscription allowsyou to update it?（）
- A、Phase
- B、Status
- C、Source Type
- D、Rule Function
- E、Customization Level
正确答案:E
第5题：
You are maintaining the SALES database for an organization. You have enabled the Flashback Database feature and want to estimate the flashback space required for future operations. Which view would you query to estimate the flashback space required？（）
- A、 V$DATABASE
- B、 V$FLASHBACK_DATABASE_STAT
- C、 V$FLASHBACK_DATABASE_LOG
- D、 V$RECOVERY_FILE_DEST
正确答案:B
第6题：
You are maintaining the SALES database.You have added a new disk to a disk group. Automatic Storage Management performs the rebalancing activity. You want to speed up the rebalancing activity.Which parameter should you specify to control the speed of the rebalancing activity?（）
- A、ASM_POWER_LIMIT
- B、ASM_DISKSTRING
- C、ASM_DISKGROUPS
- D、INSTANCE_TYPE
正确答案:A
第7题：
You are maintaining the SALES database for eSoft Corporation. You have not configured ASMM on the database. You want to know what size of the SGA will provide the best performance. Which advisor would you use to determine the suitable size of the SGA？（）
- A、 SQL Tuning Advisor
- B、 Undo Advisor
- C、 ADDM
- D、 Memory Advisor
正确答案:D
第8题：
You are maintaining the SALES database.You have added a new disk to a disk group. Automatic Storage Management performs the rebalancing activity. You want to speed up the rebalancing activity.Which parameter should you specify to control the speed of the rebalancing activity?（）
A. ASM_POWER_LIMIT
B. ASM_DISKSTRING
C. ASM_DISKGROUPS
D. INSTANCE_TYPE
第9题：
You are maintaining your production database in Oracle10g. You want the circular reuse records in the control file of the target database to be reused as required. Which value will you set for the CONTROL_FILE_RECORD_KEEP_TIME initialization parameter？（）
- A、 0
- B、 1
- C、 NONE
- D、 DEFAULT
正确答案:A
第10题：
You are maintaining the SALES database of a company. You have never backed up the USERS tablespace that is currently offline. On Sunday， you issued the following commands： CONFIGURE DEFAULT DEVICE TYPE TO sbt； CONFIGURE BACKUP OPTIMIZATION ON； CONFIGURE RETENTION POLICY TO REDUNDANCY 3； From Monday to Saturday， you performed the following actions： Day Action Monday BACKUP DATABASE Tuesday BACKUP DATABASE Wednesday BACKUP DATABASE Thursday BACKUP DATABASE Friday BACKUP DATABASE Saturday BACKUP DATABASE How many times will the backup of the USERS tablespace be performed？（）
- A、 The backup will not be performed at all.
- B、 three times
- C、 four times
- D、 six times
正确答案:C