单选题In one of your online transaction processing （OLTP） applications， users are manipulating and querying a database table simultaneously. From the Segment Advisor， you find that one of the tables is highly fragmented and you want to shrink the table immed

第1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

第2题：

In one of your online transaction processing （OLTP） applications， most users frequently modify the values， including the key values， of the application tables. Some users generate application reports by using multiple application tables.  What is the best table structure that you can use to gain optimal performance？（）

• A、heap table
• B、object table
• C、external table
• D、clustered table
• E、global temporary table
• F、index-organized table （IOT）

第3题：

In one of your online transaction processing （OLTP） applications， most users frequently modify the values， including the key values， of the application tables. Some users generate application reports by using multiple application tables.  What is the best table structure that you can use to gain optimal performance？（）

• A、heap table
• B、object table
• C、external table
• D、clustered table
• E、global temporary table
• F、index­organized table （IOT）

第4题：

You use the segment advisor to help determine objects for which space may be reclaimed. Which three statements are true about the advisor given by the segment advisor?（）

• A、It may advise the use of online table redefinition for tables in dictionary managed tablespace.
• B、It may advise the use of segment shrink for tables in dictionary managed tablespaces it the no chained rows.
• C、It may advise the use of online table redefinition for tables in locally managed tablespaces
• D、It will detect and advise about chained rows.
• E、It may advise the use of segment shrink for free list managed tables.

第5题：

In one of your online transaction processing （OLTP） applications， users are manipulating and querying a database table simultaneously. From the Segment Advisor， you find that one of the tables is highly fragmented and you want to shrink the table immediately without affecting the currently active queries.  Which option would you use with the ALTER TABLE command to achieve this objective？（）

• A、REBUILD
• B、CASCADE
• C、TRUNCATE
• D、ROW MOVEMENT
• E、SHRINK SPACE COMPACT
• F、SHRINK SPACE CASCADE

第6题：

In which case would you use a FULL OUTER JOIN?（）

• A、Both tables have NULL values.
• B、You want all unmatched data from one table.
• C、You want all matched data from both tables.
• D、You want all unmatched data from both tables.
• E、One of the tables has more data than the other.
• F、You want all matched and unmatched data from only one table.

第7题：

You discover that your Recycle Bin contains two tables with the same name, MY_TABLE. You also have a table named MY_TABLE in your schema. You execute the following statement: FLASHBACK TABLE my_table TO BEFORE DROP RENAME TO my_table2; What will be the result of executing this statement?（）

• A、One of the tables is recovered from the Recycle Bin using a First In First Out (FIFO) approach.
• B、One of the tables is recovered from the Recycle Bin using a Last In First Out (LIFO) approach.
• C、Both the tables are recovered from the Recycle Bin with one table renamed to MY_TABLE2 and the other to a system-generated name.
• D、None of the tables are recovered from the Recycle Bin, and the statement returns an error.

第8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）

第9题：

You are using flat files as the data source for one of your data warehousing applications. You plan to move the data from the flat file structures to an Oracle database to optimize the application performance. In your database you have clustered tables. While migrating the data， you want to have minimal impact on the database performance and optimize the data load operation. Which method would you use to load data into Oracle database？（）

• A、use the external table population
• B、use the Oracle Data Pump export and import utility
• C、use the conventional path data load of SQL*Loader utility
• D、use the direct path data load of Oracle export and import utility

第10题：

You create a table in your database that contains 50，000 rows approximately. The queries performed on the table are complex and performed on the table frequently. Which advisor helps you achieve the best performance of database for queries by recommending the appropriate indexes？（）  

• A、SQL Access Advisor
• B、 Memory Advisor
• C、SQL Tuning Advisor
• D、 Segment Advisor