单选题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

第1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.

第2题：

You examine the output of SHOW GLOBAL STATUS and notice that the value of Created_tmp_disk_tables is consistently increasing. Which two variables would likely fix this issue?（）

• A、Table_open_cache
• B、Table_open_cache_instancs
• C、Table_definition_cache
• D、Tmp_table_size
• E、Max_heap_table_size
• F、Max_tmp_tables

第3题：

第4题：

You issued the following statement in your SQL*Plus session：   SQL>ALTER SESSION ENABLE RESUMABLE TIMEOUT 600；   Which operation is neither suspended nor resumed using the Automatic Resumable Allocation feature in your database？（）

• A、 creating a table in your schema and you exceed your allocated space quota on the tablespace
• B、 executing a long query that involves a sort operation and the statement runs out of temporary space
• C、 loading data into tables by using the SQL*Loader and the number of extents in the table reaches the maximum limit
• D、 creating a table in a dictionary-managed tablespace with an explicit MAXEXTENTS setting which results in an out of space error

第5题：

You are creating the CUST_PREMIUM data block in the AUTO_INSURANCE form. A new state law requires that premiums be lowered for drivers with a good driving history. Because this could potentially affect a large number of records, you want to base the data block on a stored procedure returning a table of records. Which statement supports this approach?（）

• A、A table of records is efficient in terms of network traffic. 
• B、A table of records improves developer productivity because the database administrator does not have to create a server side view. 
• C、A table of records is efficient because the number of records fetched depends on the Array Fetch property value.
• D、Your coding effort is simplified since DML operations are handles by setting form module properties.

第6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.

第7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.

第8题：

第9题：

Your database is running under automatic undo management and the UNDO_RETENTION parameter is set to 900 sec. You executed the following command to enable retention guarantee：  SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE;  What effect would this statement have on the database？（）

• A、The extents in undo tablespace retain data until the next full database backup.
• B、The extents containing committed data in the undo tablespace are never overwritten.
• C、The extents which no longer contain uncommitted data in the undo tablespace are not overwritten for at least15 minutes.
• D、The extents containing committed data in the undo tablespace are not overwritten until the instance  is shut down.

第10题：

Two database users, Jack and Bill, are accessing the SupportCenter STAFF table of the SupportCenter DB database. When Jack modifies a value in the table, the new value is invisible to Bill. Which is the modified value invisible to Bill?（）

• A、The modified data are not available on disk.
• B、The modified data have been flushed out from memory.
• C、The modified rows of the SupportCenter STAFF table have been locked.
• D、Jack has not committed the changes after modifying the value.
• E、Both users are accessing the database from two different machines.