column sizes
column data types
PCTFREE
projected number of row
PCTUSED
第1题：
You added a PHONE_NUMBER column of NUMBER data type to an existing EMPLOYEES table. The EMPLOYEES table already contains records of 100 employees. Now, you want to enter the phone numbers of each of the 100 employees into the table. Some of the employees may not have a phone number available. Which data manipulation operation do you perform? （）
A. MERGE
B. INSERT
C. UPDATE
D. ADD
E. ENTER
F. You cannot enter the phone numbers for the existing employee records.
第2题：
You create a data block based on a relation table containing a REF column. You select the REF column for your form module. Which statement about the REF column is true?（）
第3题：
A. Drop the table.
B. Partition the table
C. Truncate the table.
D. Add a column to the table.
E. Rename a column in the table.
第4题：
You enabled Flashback Data Archive on the INVENTORY table. Which DDL operation is supported on the table after enabling Flashback Data Archive？（）
第5题：
You are creating a form that will access an Oracle8 database. On which three sources can you base a data block?（）
第6题：
In which situations does the Oracle Data Pump use external tables and not the direct path load whileexporting a table（）
第7题：
You enabled Flashback Data Archive on the INVENTORY table.Which DDL operation is supported on the table after enabling Flashback Data Archive?（）
第8题：
A. It collects statistics into the pending area in the data dictionary
B. It creates a virtual hidden column in the CUSTOMERS_OBE table
C. It collects statistics with AUTO_SAMPLE_SIZE for ESTIMATE_PERCENT
D. It creates a histogram to hold skewed information about the data in the columns
第9题：
On Jan 11， 2005 at 2：30 P.M.， an erroneous update operation modified all the values of column LASTNAME in the EMPLOYEE table in the Scott schema to an empty string. You are the system administrator， and you want to return the original values in the table. To do so， you decided to flash back the table. Which two options can you use to flash back a table？（）
第10题：
You work as a database administrator for Certkiller .com. While loading data into the Certkiller STAFF table using Oracle Enterprise Manager 10g Database Control， you find the status of the job as failed. On further investigation， you find the following error message in the output log： ORA-01653 unable to extend table HR. Certkiller STAFF by 8 intablespaceUSERS Which task would you perform to load the data successfully without affecting the users who are accessing the table？（）