While designing your database, you have created the EMPLOYEE

题目
单选题
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.

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相似问题和答案

第1题:

If you create your database using Oracle Managed Files (OMF), what is true?()

  • A、You must use Oracle predefined names to identify raw partitions that will hold OMF structures. 
  • B、You must define directories for two online redo log groups and three copies of the control file. 
  • C、If your CREATE DATABASE command fails, any OMF database files that have already been created will be dropped automatically. 
  • D、You must use only OMF data files when adding new tablespaces or data files to your database in the future.

正确答案:D

第2题:

You are maintaining your database in Oracle10g. While performing an incremental backup of the database, you want to back uponly those blocks that have changed since the last backup. Which file will you create to increase the performance of the backup operation while performing the incremental backup of the database?()

  • A、 redo log files
  • B、 password file
  • C、 control file
  • D、 change tracking file

正确答案:D

第3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

第4题:

单选题
While designing the database for one of your online transaction processing (OLTP) applications, you want to achieve the following:  a) high availability of data  b) faster primary key access to the table data  c) compact storage for the table  Which type of tables would you use to achieve these objectives?()
A

heap tables

B

object tables

C

partitioned tables

D

index­organized tables (IOTs)


正确答案: D
解析: 暂无解析

第5题:

单选题
You are designing the physical database layout on your host machine. What is the relationship between tablespaces and datafiles in the Oracle database?()
A

One tablespace has only one datafile

B

Many tablespaces can share one datafile

C

One tablespace can have many datafiles

D

One datafile can contain many tablespaces


正确答案: C
解析: 暂无解析

第6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7题:

单选题
You have created a baseline metric, DISK_IO_BL, for the disk I/O metrics in your PROD database and you have been getting notifications whenever the database performance degrades. You optimize the database I/O to gain the performance and you decide to remove the baseline metrics. Which method would you use to remove the DISK_IO_BL baseline metrics?()
A

The baseline, once created, cannot be removed.

B

Disable the baseline metrics in the Database Control Manage Metrics page.

C

The baseline will be automatically removed once the database performance has been optimized.

D

Drop the baseline metrics by usingDBMS_WORKLOAD_REPOSITORY.DROP_BASELINE procedure.


正确答案: A
解析: 暂无解析

第8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:B

第9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10题:

单选题
Your database is in NOARCHIVELOG mode. The database has three online redo log groups, and each group contains three online redo log members. The online redo log members are stored across three hard disks, E, F, and G, respectively. Hard disk G crashed while the LGWR background process was writing redo information to the online redo log files. What effect will this crash have on the database?()
A

 The database will operate normally without generating any redo.

B

 The database will hang, and you must shut down and restart the instance.

C

 The database will crash, and you must recover the database from the point of failure.

D

 The database will operate normally and will generate minimal redo for the tables created with the NOLOGGING clause.


正确答案: A
解析: 暂无解析

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