单选题In your test database， you have created the ORDERS table as an index/x7forganized table （IOT）. To facilitate faster querying， you have created a mapping table and a bitmap index on the ORDER_FILLED column. You observe that the query performance degrade

题目
单选题
In your test database， you have created the ORDERS table as an index/x7forganized table （IOT）. To facilitate faster querying， you have created a mapping table and a bitmap index on the ORDER_FILLED column. You observe that the query performance degrades when users perform a large volume of transactions.  While investigating the reason， you find that the mapping table segment is fragmented， leading to poor performance. Which option would you use to defragment the mapping table without affecting the original table data？（）
A

export and import the mapping table

B

drop and re­create the mapping table

C

truncate the mapping table and reinsert the values

D

use the ALTER TABLE .. REBUILD command to defragment the mapping table

相似考题

1.Which describes the default behavior when you create a table? ()A. The table is accessible to all users.B. Tables are created in the public schema.C. Tables are created in your schema.D. Tables are created in the DBA schema.E. You must specify the schema when the table is created.

2.While designing your database， you have created the EMPLOYEES table as an index-organized table （IOT）. You want to create a bitmap index on the JOB_ID column to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（） A、A primary key must have been created.B、A mapping table must have been created.C、An overflow tablespace must have been specified.D、The PCTTHRESHOLD option must have been specified.

3.The database administrator of your company created a public synonym called HR for the HUMAN_RESOURCES table of the GENERAL schema, because many users frequently use this table. As a user of the database, you created a table called HR in your schema. What happens when you execute this query? SELECT * FROM HR; （）A、You obtain the results retrieved from the public synonym HR created by the database administrator.B、You obtain the results retrieved from the HR table that belongs to your schema.C、You get an error message because you cannot retrieve from a table that has the same name as a public synonym.D、You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a Cartesian product.E、You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a FULL JOIN.

4.While designing your database， you have created the EMPLOYEES table as an index/x7forganized table （IOT）. You want to create a bitmap index on the JOB_ID column to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（）A、A primary key must have been created.B、A mapping table must have been created.C、An overflow tablespace must have been specified.D、The PCTTHRESHOLD option must have been specified.

更多“In your test database， you have created the ORDERS table as ”相关问题

  • 第1题：

    Your company uses a SQL Server 2005 database. This database contains a trigger named trg_InsertOrders, which fires when order data is inserted into the Orders table. The trigger is responsible for ensuring that a customer exists in the Customers table before data is inserted into the Orders table. You need to configure the trigger to prevent it from firing during the data import process. You must accomplish this goal while using the least amount of administrative effort.  Which two Transact-SQL statements can you use to achieve this goal?（）

    • A、 ALTER TABLE OrdersDISABLE TRIGGER trg_InsertOrders 
    • B、 DROP TRIGGER trg_InsertOrders 
    • C、 DISABLE TRIGGER trg_InsertOrders ON Orders 
    • D、 ALTER TRIGGER trg_InsertOrders  ON Orders NOT FOR REPLICATION 
    • E、 sp_settriggerorder@triggername= 'trg_InsertOrders', @order='None'

    正确答案:A,C

  • 第2题：

    While designing your database， you have created the EMPLOYEEStable as an index-organized （IOT）. You want to create a bitmap index on the JOD_IDcolumn to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（）

    • A、 A primary key must have been created.
    • B、 A mapping table must have been created.
    • C、 An overflow tablespace must have been specified.
    • D、 The PCTTHRESHOLD option must have been specified.

    正确答案:B

  • 第3题：

    An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command: SQL>CREATE INDEX ord_custname_ix ON orders(custname); The ORDERS table is frequently queried using the CUSTNAME column in the WHERE clause. You want to check the impact on the performance of the queries if the index is not available. You do not want the index to be dropped or rebuilt to perform this test.Which is the most efficient method of performing this task?（）

    • A、disabling the index
    • B、making the index invisible
    • C、making the index unusable
    • D、using the MONITORING USAGE clause for the index

    正确答案:B

  • 第4题：

    You are performing flashback of the ORDERS table in the Scott’s schema because some important data is deleted in the table by mistake. The SCN number was 771513 at the time of deletion. You issued the following statement to perform Flashback Table：  SQL> FLASHBACK TABLE ORDERS TO SCN 771513；   What is the prerequisite to perform Flashback Table？（）

    • A、 You must configure OMF in your database.
    • B、 You must enable block change tracking feature in your database.
    • C、 You must enable ROW MOVEMENT feature on the ORDERS table.
    • D、 You must use the Flashback Version Query before using the Flashback Table feature.

    正确答案:C

  • 第5题：

    多选题
    You work as a database administrator for Certkiller .com. In your transaction application， you have scheduled a job to update the optimizer statistics at05：00 pm every Friday. The job has successfully completed. Which three pieces of information would you check to confirm that the statistics have been collected？（）
    A

    Average row size

    B

    Last analyzed date

    C

    Size of table in bytes

    D

    Size of table in database blocks

    E

    Number of free blocks in the free list

    F

    Number of extents present in the table.


    正确答案： F,A
    解析： 暂无解析

  • 第6题：

    单选题
    While creating a database using Database Configuration Assistant tool， you created a database default temporary tablespace. Which activity would cause the default temporary tablespace of the database to be used？（）
    A

    the CREATE TABLE .. command

    B

    sorting of the SYSTEM tablespace’s data

    C

    sorting of data required by recursive SQL statements

    D

    the CREATE TABLE .. ORGANIZATION EXTERNAL .. command

    E

    sorting of data if the users have not been allocated temporary tablespace explicitly

    F

    sorting of data if the users have been allocated temporary tablespace explicitly


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    You query the ORDERS table and discover that order number 1101 is missing. One of your reports， generated at 5：00 A.M. on April 23， 2005 using Oracle Reports， includes this order number in the output. You have inserted 100 new orders into the ORDERS table since generating this report. Which flashback technology would you use to recover order number 1101 into the ORDERS table without losing the 100 orders that you added after the report was generated？（）
    A

     Flashback Table

    B

     Flashback Query

    C

    Flashback Version Query

    D

     Flashback Transaction Query


    正确答案： C
    解析： 暂无解析

  • 第8题：

    多选题
    On your Oracle Database, you issue the following commands to create indexes: SQL > CREATE INDEX oe.ord_customer_ix1 ON oe.orders (customer_id, sales_rep_id) INVISIBLE; SQL> CREATE BITMAP INDEX oe.ord_customer_ix2 ON oe.orders (customer_id, sales_rep_id); Which two statements are true?（）
    A

    Only the ORD_CUSTOMER_IX1 index created.

    B

    Both the indexes are updated when a row is inserted, updated, or deleted in the ORDERS table.

    C

    Both the indexes are created: however, only ORD_CUSTOMERS_IX1 is used by the optimizer for queries on the ORDERS table.

    D

    The ORD_CUSTOMER_IX1 index is not used by the optimizer even when the OPTIMIZER_USE_INVISIBLE_INDEXES parameters is set to true.

    E

    Both the indexes are created and used by the optimizer for queries on the ORDERS table.

    F

    Both the indexes are created: however, only ORD_CUSTOMERS_IX2 is used by the optimizer for queries on the ORDERS table.


    正确答案： D,E
    解析： 暂无解析

  • 第9题：

    单选题
    While designing your database， you have created the EMPLOYEES table as an index/x7forganized table （IOT）. You want to create a bitmap index on the JOB_ID column to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（）
    A

    A primary key must have been created.

    B

    A mapping table must have been created.

    C

    An overflow tablespace must have been specified.

    D

    The PCTTHRESHOLD option must have been specified.


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    While designing your database， you have created the EMPLOYEEStable as an index-organized （IOT）. You want to create a bitmap index on the JOD_IDcolumn to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（）
    A

     A primary key must have been created.

    B

     A mapping table must have been created.

    C

     An overflow tablespace must have been specified.

    D

     The PCTTHRESHOLD option must have been specified.


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command：   SQL>CREATE INDEX ord_custname_ix ON orders（custname）；   The ORDERS table is frequently queried using the CUSTNAME column in the WHERE clause. You want to check the impact on the performance of the queries if the index is not available. You do not want the index to be dropped or rebuilt to perform this test.  Which is the most efficient method of performing this task？（）
    A

     disabling the index

    B

     making the index invisible

    C

     making the index unusable

    D

     using the MONITORING USAGE clause for the index


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    You created the ORDERS table in your database by using the following code：   SQL> CREATE TABLE ORDERS （ORDER_DATE TIMESTAMP（0） WITH TIME ZONE）；   Then， you inserted data in the ORDERS table and saved it by issuing the following statements：SQL> INSERT INTO ORDERS VALUES（’18-AUG-00 10：26：44 PM America/New_York’）；   SQL> INSERT INTO ORDERS VALUES（’23-AUG-02 12：46：34 PM America/New_York’）；   SQL> COMMIT；   Next， you issued the following statement to change the time zone for the database：   SQL> ALTER DATABASE SET TIME_ZONE=’Europe/London’；   What will be the result of executing the above statement？（）
    A

     The statement will fail.

    B

     The statement will be executed successfully， and the new time zone will be set for the database.

    C

     The statement will be executed successfully， but the new time zone will be set for the current session.

    D

    The statement will be executed successfully， but the new time zone will neither be set for the database nor for a specific session.


    正确答案： A
    解析： 暂无解析

  • 第13题：

    You work as a database administrator for Certkiller .com. In your transaction application， you have scheduled a job to update the optimizer statistics at05：00 pm every Friday. The job has successfully completed. Which three pieces of information would you check to confirm that the statistics have been collected？（）

    • A、Average row size
    • B、Last analyzed date
    • C、Size of table in bytes
    • D、Size of table in database blocks
    • E、Number of free blocks in the free list
    • F、Number of extents present in the table.

    正确答案:A,B,D

  • 第14题：

    A table was just created on your Oracle database with six extents allocated to it. Which of the following factors most likely caused the table to have so many extents allocated?（）

    • A、The value for MINEXTENTS setting 
    • B、The value for PCTINCREASE setting 
    • C、The value for MAXEXTENTS setting 
    • D、By default, Oracle allocates six extents to all database objects

    正确答案:A

  • 第15题：

    Flashback Database is enabled in your Oracle 10g database. One of your database users erroneously purged an important table residing in his schema. The table was purged sometime between 10：00 P.M. and 10：30 P.M. The next day， you decide to flash back the database. Before you flash back the database， you want to ensure that you have all the necessary flashback data. Which dynamic performance view must you use to determine whether you have the required flashback data to recover the purged table？（）

    • A、 V$DATABASE
    • B、 V$UNDOSTAT
    • C、 V$FLASHBACK_DATABASE_LOG
    • D、 V$FLASHBACK_DATABASE_STAT

    正确答案:C

  • 第16题：

    You are a professional level SQL Server 2005 database administrator in an international corporation named Wiikigo. You are experienced in implementing high-availability solutions， monitoring the database server， and design deployment. In the company， you major job is the deployment， maintenance and support of Microsoft SQL Server 2005. You work as a database administrator for your company. A SQL Server 2005 computer is managed by you， and a database named Customers is included by the SQL Server 2005 computer. A table named CustInfo is included by the database. An identity column named CustID and an nvarchar column named CustName are included by the table. According to the company requirement， rows which duplicate CustName values are included should be moved from the CustInfo table every year. However， the company requests to have rows removed from the CustInfo table after the rows have been manually examined and verified as being duplicates. Since you are the technical support， you are required to think out a method to have potential duplicate rows identified for manual examination. The minimum amount of administrative effort should be utilized.  Which action should be performed to finish the task？（）

    • A、A trigger should be created for the CustInfo table so as to roll back INSERT queries that duplicate data is included.
    • B、A new unique index should be created on the CustName column. And then， IGNORE_DUP_KEY = ON should be specified when creating index.
    • C、On the CustName column， a foreign key constraint should be created， and a distinct list of CustName values is referenced by the foreign key constraint.
    • D、A SELECT INTO query should be utilized， and GROUP BY and HAVING clauses should be included by the query to create a new table that contains duplicate rows from the CustInfo table.

    正确答案:D

  • 第17题：

    多选题
    In your Oracle 10g database ， you have scheduled a job to update the optimizer statistics at 05：00 pm every Friday. The job has successfully completed. Which three pieces of information would you check to confirm that the statistics have been collected？（）
    A

    average row size

    B

    last analyzed date

    C

    size of table in bytes

    D

    size of table in database blocks

    E

    number of free blocks in the free list

    F

    number of extents present in the table


    正确答案： A,C
    解析： 暂无解析

  • 第18题：

    单选题
    The database administrator of your company created a public synonym called HR for the HUMAN_RESOURCES table of the GENERAL schema, because many users frequently use this table. As a user of the database, you created a table called HR in your schema. What happens when you execute this query? SELECT * FROM HR;（）
    A

    You obtain the results retrieved from the public synonym HR created by the database administrator.

    B

    You obtain the results retrieved from the HR table that belongs to your schema.

    C

    You get an error message because you cannot retrieve from a table that has the same name as a public synonym.

    D

    You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a Cartesian product.

    E

    You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a FULL JOIN.


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    You are configuring the data source for an Oracle database. You will need to specify a test table for WebLogic to test the status of the database. Which option should you choose?（）
    A

    a table name which has 100s of records

    B

    a table name which has 10s of records

    C

    a table name which has empty records

    D

    a table name which has 1000s of records

    E

    never use a table name


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    In your test database， you have created the ORDERS table as an index-organized table （IOT）. To facilitate faster querying， you have created a mapping table and a bitmap index on the ORDER_FILLED column. You observe that the query performance degrees when users perform a large volume of transactions. While investigating the reason， you find that the mapping table segment is fragmented， leading to poor performance. Which option would you use to defragment the mapping table without affecting the original table data？（）
    A

     Export and import the mapping table.

    B

     Drop and re-create the mapping table.

    C

     Truncate the mapping table and reinsert the values.

    D

     Use the ALTER TABLE .. REBUILD command to defragment the mapping table.


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    You are performing flashback of the ORDERS table in the Scott’s schema because some important data is deleted in the table by mistake. The SCN number was 771513 at the time of deletion. You issued the following statement to perform Flashback Table：  SQL> FLASHBACK TABLE ORDERS TO SCN 771513；   What is the prerequisite to perform Flashback Table？（）
    A

     You must configure OMF in your database.

    B

     You must enable block change tracking feature in your database.

    C

     You must enable ROW MOVEMENT feature on the ORDERS table.

    D

     You must use the Flashback Version Query before using the Flashback Table feature.


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    In your test database， you have created the ORDERS table as an index-organized table （IOT）. To facilitate faster querying， you have created a mapping table and a bitmap index on the ORDER_FILLED column. You observe that the query performance degrades when users perform a large volume of transactions.  While investigating the reason， you find that the mapping table segment is fragmented， leading to poor performance.   Which option would you use to defragment the mapping table without affecting the original table data？（）
    A

    export and import the mapping table

    B

    drop and re-create the mapping table

    C

    truncate the mapping table and reinsert the values

    D

    use the ALTER TABLE···REBUILD command to defragment the mapping table


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    You are a professional level SQL Sever 2008 Database Administrator in an international corporation named Wiikigo. You are experienced in managing databases in an enterprise-level organization, optimizing and sustaining the database life cycle. In the company, your job is to implement solutions on security, troubleshooting, deployment and optimization. A SQL Server 2008 infrastructure is managed by you. A maintenance strategy should be designed for a mission-critical database, and a large table named Orders is contained by the database. Index maintenance operations are contained in the design plan. When you design the strategy, the facts listed below should be taken into consideration. First, the users continuously access to the Orders table in the database. Secondly, a column of the xml data type is contained by Orders table.  Thirdly, the new rows are regularly added to the Orders table. Fourthly, the average fragmentation for the clustered index of the Orders table is no more than 2 percent.    A strategy should be designed to have the performance of the queries on the table optimized.    Which action will you perform?（）
    A

    The clustered index of the Orders table should be dropped.

    B

    The clustered index of the Orders table offline should be rebuilt once a month.

    C

    The clustered index of the Orders table should be excluded from scheduled reorganizing or rebuilding operations.

    D

    The clustered index of the Orders table should be reorganized by reducing the fill factor.


    正确答案： A
    解析： 暂无解析

  • 第24题：

    单选题
    You are a professional level SQL Server 2005 database administrator in an international corporation named Wiikigo. You are experienced in implementing high-availability solutions， monitoring the database server， and design deployment. In the company， you major job is the deployment， maintenance and support of Microsoft SQL Server 2005. You work as a database administrator for your company. A SQL Server 2005 computer is managed by you， and a database named Customers is included by the SQL Server 2005 computer. A table named CustInfo is included by the database. An identity column named CustID and an nvarchar column named CustName are included by the table. According to the company requirement， rows which duplicate CustName values are included should be moved from the CustInfo table every year. However， the company requests to have rows removed from the CustInfo table after the rows have been manually examined and verified as being duplicates. Since you are the technical support， you are required to think out a method to have potential duplicate rows identified for manual examination. The minimum amount of administrative effort should be utilized.  Which action should be performed to finish the task？（）
    A

    A trigger should be created for the CustInfo table so as to roll back INSERT queries that duplicate data is included.

    B

    A new unique index should be created on the CustName column. And then， IGNORE_DUP_KEY = ON should be specified when creating index.

    C

    On the CustName column， a foreign key constraint should be created， and a distinct list of CustName values is referenced by the foreign key constraint.

    D

    A SELECT INTO query should be utilized， and GROUP BY and HAVING clauses should be included by the query to create a new table that contains duplicate rows from the CustInfo table.


    正确答案： B
    解析： 暂无解析

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